feat: related-tags atlas in Explore view

Hovering a tag in Explore now loads and displays co-occurring tags as a
weighted cloud. New `get_related_tags` SQL self-join (db.rs/commands.rs),
`loadRelatedTags` store action with per-folder keyed cache, and TagCloud
atlas UI with ResizeObserver-driven layout and RAF animation. Explore tag
limit raised to 180; tag cloud auto-refreshes 700ms after new AI tagging
completes.

src-tauri/src/commands.rs

@@ -180,6 +180,19 @@ pub struct GetExploreTagsParams {
     pub limit: Option<usize>,
 }
 
+#[derive(Deserialize)]
+pub struct GetRelatedTagsParams {
+    pub tag: String,
+    pub folder_id: Option<i64>,
+    pub limit: Option<usize>,
+}
+
+#[derive(Serialize)]
+pub struct RelatedTagEntry {
+    pub tag: String,
+    pub shared_count: i64,
+}
+
 #[derive(Deserialize)]
 pub struct SearchTagsAutocompleteParams {
     pub query: String,
@@ -1277,7 +1290,28 @@ pub async fn get_explore_tags(
     params: GetExploreTagsParams,
 ) -> Result<Vec<ExploreTagEntry>, String> {
     let conn = db.get().map_err(|e| e.to_string())?;
-    db::get_explore_tags(&conn, params.folder_id, params.limit.unwrap_or(48))
+    db::get_explore_tags(&conn, params.folder_id, params.limit.unwrap_or(180))
+        .map_err(|e| e.to_string())
+}
+
+#[tauri::command]
+pub async fn get_related_tags(
+    db: State<'_, DbState>,
+    params: GetRelatedTagsParams,
+) -> Result<Vec<RelatedTagEntry>, String> {
+    let tag = params.tag.trim();
+    if tag.is_empty() {
+        return Ok(vec![]);
+    }
+
+    let conn = db.get().map_err(|e| e.to_string())?;
+    db::get_related_tags(&conn, tag, params.folder_id, params.limit.unwrap_or(16))
+        .map(|entries| {
+            entries
+                .into_iter()
+                .map(|(tag, shared_count)| RelatedTagEntry { tag, shared_count })
+                .collect()
+        })
         .map_err(|e| e.to_string())
 }
 

src-tauri/src/db.rs

@@ -2436,6 +2436,34 @@ pub fn get_explore_tags(
     Ok(rows)
 }
 
+pub fn get_related_tags(
+    conn: &Connection,
+    tag: &str,
+    folder_id: Option<i64>,
+    limit: usize,
+) -> Result<Vec<(String, i64)>> {
+    let mut stmt = conn.prepare(
+        "SELECT other.tag, COUNT(DISTINCT other.image_id) AS shared_count
+         FROM image_tags base
+         JOIN image_tags other ON other.image_id = base.image_id
+         JOIN images i ON i.id = base.image_id
+         WHERE base.tag = ?1
+           AND other.tag != base.tag
+           AND (?2 IS NULL OR i.folder_id = ?2)
+         GROUP BY other.tag
+         ORDER BY shared_count DESC, other.tag ASC
+         LIMIT ?3",
+    )?;
+
+    let rows = stmt
+        .query_map(params![tag, folder_id, limit as i64], |row| {
+            Ok((row.get::<_, String>(0)?, row.get::<_, i64>(1)?))
+        })?
+        .collect::<rusqlite::Result<Vec<_>>>()?;
+
+    Ok(rows)
+}
+
 type FailedEmbeddingRow = (i64, String, String, Option<String>);
 
 pub fn get_failed_embedding_images(

src-tauri/src/lib.rs

@@ -197,6 +197,7 @@ pub fn run() {
             commands::get_worker_states,
             commands::get_tag_cloud,
             commands::get_explore_tags,
+            commands::get_related_tags,
             commands::get_images_by_ids,
             commands::get_failed_embedding_images,
             commands::get_failed_tagging_images,

src/components/TagCloud.tsx

@@ -1,6 +1,6 @@
-import { useEffect, useLayoutEffect, useMemo, useRef, useState } from "react";
+import { useCallback, useEffect, useLayoutEffect, useMemo, useRef, useState } from "react";
 import { motion, useReducedMotion } from "framer-motion";
-import { ExploreTagEntry, TagCloudEntry, useGalleryStore } from "../store";
+import { ExploreMode, ExploreTagEntry, RelatedTagEntry, TagCloudEntry, useGalleryStore } from "../store";
 import { FolderScopeDropdown } from "./FolderScopeDropdown";
 import { Tooltip } from "./Tooltip";
 import { mediaSrc } from "../lib/mediaSrc";
@@ -224,59 +224,361 @@ function CloudCard({ node, onOpen, animated }: { node: PlacedNode; onOpen: (imag
   );
 }
 
-// Actual tag cloud — word size driven by log-scaled frequency
-function TagWord({
-  entry,
-  index,
-  logMin,
-  logRange,
-  onSearch,
-}: {
+interface AtlasNode {
   entry: ExploreTagEntry;
   index: number;
-  logMin: number;
-  logRange: number;
+  x: number;
+  y: number;
+  w: number;
+  h: number;
+  fontSize: number;
+  ratio: number;
+  accent: string;
+  driftX: number;
+  driftY: number;
+}
+
+interface TagAnchor {
+  x: number;
+  y: number;
+}
+
+const TAG_ATLAS_MAX_VISIBLE = 132;
+const TAG_ATLAS_DENSE_THRESHOLD = 120;
+
+function buildTagAtlas(entries: ExploreTagEntry[], containerW: number, containerH: number, isLight: boolean): AtlasNode[] {
+  if (!entries.length || containerW <= 0 || containerH <= 0) return [];
+
+  const logs = entries.map((entry) => Math.log(Math.max(entry.count, 1)));
+  const logMin = Math.min(...logs);
+  const logRange = Math.max(...logs) - logMin || 1;
+  const cx = containerW / 2;
+  const cy = containerH * 0.48;
+  const spreadX = containerW * 0.47;
+  const spreadY = containerH * 0.46;
+  const accents = isLight ? LIGHT_ACCENTS : ACCENTS;
+
+  const nodes = entries.map((entry, index) => {
+    const ratio = (Math.log(Math.max(entry.count, 1)) - logMin) / logRange;
+    const densityScale = entries.length > TAG_ATLAS_DENSE_THRESHOLD ? 0.94 : 1;
+    const fontSize = (9.75 + Math.pow(ratio, 0.92) * 19.5) * densityScale;
+    const maxWidthRatio = index < 48 ? 0.32 : index < 100 ? 0.26 : 0.2;
+    const textWidth = entry.tag.length * fontSize * 0.5 + (ratio > 0.55 ? 36 : 26);
+    const w = Math.min(containerW * maxWidthRatio, textWidth);
+    const h = fontSize * 1.18 + 14;
+    const radialRatio = Math.sqrt((index + 0.5) / entries.length);
+    const angle = index * GOLDEN_ANGLE;
+    return {
+      entry,
+      index,
+      x: cx + Math.cos(angle) * radialRatio * spreadX,
+      y: cy + Math.sin(angle) * radialRatio * spreadY,
+      w,
+      h,
+      fontSize,
+      ratio,
+      accent: accents[index % accents.length],
+      driftX: (seeded(index + 101) - 0.5) * 7,
+      driftY: (seeded(index + 113) - 0.5) * 6,
+    };
+  });
+
+  const padX = entries.length > TAG_ATLAS_DENSE_THRESHOLD ? 4 : 10;
+  const padY = entries.length > TAG_ATLAS_DENSE_THRESHOLD ? 3 : 7;
+  const margin = 28;
+  for (let iter = 0; iter < 140; iter++) {
+    for (let a = 0; a < nodes.length; a++) {
+      const na = nodes[a];
+      for (let b = a + 1; b < nodes.length; b++) {
+        const nb = nodes[b];
+        const dx = nb.x - na.x;
+        const dy = nb.y - na.y;
+        const overlapX = (na.w + nb.w) / 2 + padX - Math.abs(dx);
+        const overlapY = (na.h + nb.h) / 2 + padY - Math.abs(dy);
+        if (overlapX <= 0 || overlapY <= 0) continue;
+        if (overlapX < overlapY) {
+          const push = (overlapX / 2) * (dx >= 0 ? 1 : -1);
+          nb.x += push;
+          na.x -= push;
+        } else {
+          const push = (overlapY / 2) * (dy >= 0 ? 1 : -1);
+          nb.y += push;
+          na.y -= push;
+        }
+      }
+    }
+    for (const node of nodes) {
+      node.x = Math.min(Math.max(node.x, node.w / 2 + margin), containerW - node.w / 2 - margin);
+      node.y = Math.min(Math.max(node.y, node.h / 2 + margin), containerH - node.h / 2 - margin);
+      if (node.x <= node.w / 2 + margin || node.x >= containerW - node.w / 2 - margin) {
+        node.y += (seeded(node.index + iter + 211) - 0.5) * 2;
+      }
+      if (node.y <= node.h / 2 + margin || node.y >= containerH - node.h / 2 - margin) {
+        node.x += (seeded(node.index + iter + 223) - 0.5) * 2;
+      }
+    }
+  }
+
+  for (let iter = 0; iter < 5; iter++) {
+    const weighted = nodes.reduce(
+      (acc, node) => {
+        const weight = 1 + Math.pow(node.ratio, 1.35) * 9;
+        return {
+          x: acc.x + node.x * weight,
+          y: acc.y + node.y * weight,
+          weight: acc.weight + weight,
+        };
+      },
+      { x: 0, y: 0, weight: 0 },
+    );
+    const offsetX = containerW * 0.48 - weighted.x / weighted.weight;
+    const offsetY = containerH * 0.44 - weighted.y / weighted.weight;
+    if (Math.abs(offsetX) < 0.5 && Math.abs(offsetY) < 0.5) break;
+    for (const node of nodes) {
+      node.x = Math.min(Math.max(node.x + offsetX, node.w / 2 + margin), containerW - node.w / 2 - margin);
+      node.y = Math.min(Math.max(node.y + offsetY, node.h / 2 + margin), containerH - node.h / 2 - margin);
+    }
+  }
+
+  return nodes;
+}
+
+function TagAtlas({
+  entries,
+  onSearch,
+  loadRelatedTags,
+}: {
+  entries: ExploreTagEntry[];
   onSearch: (tag: string) => void;
+  loadRelatedTags: (tag: string) => Promise<RelatedTagEntry[]>;
 }) {
   const theme = useGalleryStore((state) => state.theme);
   const isLight = theme === "subtle-light";
-  const ratio = logRange > 0 ? (Math.log(Math.max(entry.count, 1)) - logMin) / logRange : 0.5;
-  const fontSize = 11 + ratio * 28; // 11px – 39px
-  const accent = (isLight ? LIGHT_ACCENTS : ACCENTS)[index % ACCENTS.length];
-  const tilt = (seeded(index + 5) - 0.5) * 7;
-  // Faint low-frequency words read fine as subtle white-on-dark, but the same low
-  // opacity is unreadable on the light theme's cream, so raise the floor there.
-  const minOpacity = isLight ? 0.6 : 0.4;
+  const reducedMotion = useReducedMotion();
+  const canvasRef = useRef<HTMLDivElement>(null);
+  const buttonRefs = useRef(new Map<string, HTMLButtonElement>());
+  const [canvasSize, setCanvasSize] = useState({ w: 0, h: 0 });
+  const [activeTag, setActiveTag] = useState<string | null>(null);
+  const [relatedTags, setRelatedTags] = useState<RelatedTagEntry[]>([]);
+  const [anchors, setAnchors] = useState<Record<string, TagAnchor>>({});
+  const visibleEntries = useMemo(
+    () => (entries.length > TAG_ATLAS_MAX_VISIBLE ? entries.slice(0, TAG_ATLAS_MAX_VISIBLE) : entries),
+    [entries],
+  );
+
+  useLayoutEffect(() => {
+    const el = canvasRef.current;
+    if (!el) return;
+    const update = () => {
+      const r = el.getBoundingClientRect();
+      setCanvasSize({ w: r.width, h: r.height });
+    };
+    update();
+    const ro = new ResizeObserver(update);
+    ro.observe(el);
+    return () => ro.disconnect();
+  }, []);
+
+  useEffect(() => {
+    if (!activeTag) {
+      setRelatedTags([]);
+      return;
+    }
+    let cancelled = false;
+    void loadRelatedTags(activeTag).then((entries) => {
+      if (!cancelled) setRelatedTags(entries);
+    });
+    return () => {
+      cancelled = true;
+    };
+  }, [activeTag, loadRelatedTags]);
+
+  const nodes = useMemo(
+    () => buildTagAtlas(visibleEntries, canvasSize.w, canvasSize.h, isLight),
+    [visibleEntries, canvasSize.w, canvasSize.h, isLight],
+  );
+  const nodeByTag = useMemo(() => new Map(nodes.map((node) => [node.entry.tag, node])), [nodes]);
+  const activeNode = activeTag ? nodeByTag.get(activeTag) : undefined;
+  const minOpacity = isLight ? 0.62 : 0.42;
+  const visibleConnections = useMemo(
+    () =>
+      activeNode
+        ? relatedTags
+            .map((related) => {
+              const node = nodeByTag.get(related.tag);
+              return node ? { node, related } : null;
+            })
+            .filter((item): item is { node: AtlasNode; related: RelatedTagEntry } => item !== null)
+            .slice(0, visibleEntries.length > TAG_ATLAS_DENSE_THRESHOLD ? 6 : 10)
+        : [],
+    [activeNode, nodeByTag, relatedTags, visibleEntries.length],
+  );
+  const activeAnchor = activeTag ? anchors[activeTag] : undefined;
+  const maxShared = Math.max(1, ...visibleConnections.map(({ related }) => related.shared_count));
+  const connectedByTag = useMemo(
+    () => new Map(visibleConnections.map(({ node, related }) => [node.entry.tag, related])),
+    [visibleConnections],
+  );
+
+  const setButtonRef = useCallback((tag: string, element: HTMLButtonElement | null) => {
+    if (element) {
+      buttonRefs.current.set(tag, element);
+    } else {
+      buttonRefs.current.delete(tag);
+    }
+  }, []);
+
+  const measureAnchors = useCallback(() => {
+    const canvas = canvasRef.current;
+    if (!canvas || !activeTag) {
+      setAnchors({});
+      return;
+    }
+
+    const canvasRect = canvas.getBoundingClientRect();
+    const tagsToMeasure = [activeTag, ...visibleConnections.map(({ node }) => node.entry.tag)];
+    const nextAnchors: Record<string, TagAnchor> = {};
+    for (const tag of tagsToMeasure) {
+      const element = buttonRefs.current.get(tag);
+      if (!element) continue;
+      const rect = element.getBoundingClientRect();
+      nextAnchors[tag] = {
+        x: rect.left - canvasRect.left + rect.width / 2,
+        y: rect.top - canvasRect.top + rect.height / 2,
+      };
+    }
+    setAnchors(nextAnchors);
+  }, [activeTag, visibleConnections]);
+
+  useLayoutEffect(() => {
+    if (!activeTag) {
+      setAnchors({});
+      return;
+    }
+
+    let firstFrame = 0;
+    let secondFrame = 0;
+    const settleTimer = window.setTimeout(measureAnchors, 180);
+    firstFrame = window.requestAnimationFrame(() => {
+      measureAnchors();
+      secondFrame = window.requestAnimationFrame(measureAnchors);
+    });
+    return () => {
+      window.cancelAnimationFrame(firstFrame);
+      window.cancelAnimationFrame(secondFrame);
+      window.clearTimeout(settleTimer);
+    };
+  }, [activeTag, canvasSize.w, canvasSize.h, measureAnchors]);
 
   return (
-    <Tooltip
-      label={`${entry.tag} — ${entry.count.toLocaleString()} ${entry.count === 1 ? "image" : "images"}`}
-      followCursor
-      delay={250}
-    >
-      <motion.button
-        initial={{ opacity: 0, scale: 0.6 }}
-        animate={{ opacity: minOpacity + ratio * (1 - minOpacity), scale: 1 }}
-        transition={{ delay: Math.min(index * 0.008, 0.55), duration: 0.22 }}
-        whileHover={{ scale: 1.2, opacity: 1, rotate: 0, transition: { duration: 0.14 } }}
-        className="explore-tag-word group inline-flex items-center gap-1 rounded-full px-2 py-1 transition-colors hover:bg-white/[0.07]"
-        style={{ fontSize, rotate: tilt }}
-        onClick={() => onSearch(entry.tag)}
-      >
-        <span
-          className="font-medium leading-none"
-          style={{ color: ratio > 0.55 ? accent : isLight ? "#4b5563" : "rgba(255,255,255,0.82)" }}
-        >
-          {entry.tag}
-        </span>
-        <span
-          className="rounded-full px-1.5 py-0.5 text-[9px] tabular-nums opacity-0 transition-opacity group-hover:opacity-100"
-          style={{ backgroundColor: `${accent}22`, color: accent }}
-        >
-          {entry.count.toLocaleString()}
-        </span>
-      </motion.button>
-    </Tooltip>
+    <div ref={canvasRef} className="relative min-h-0 flex-1 overflow-hidden px-8 py-8">
+      <svg className="pointer-events-none absolute inset-0 h-full w-full" aria-hidden="true">
+        <defs>
+          <radialGradient id="tag-atlas-glow" cx="50%" cy="50%" r="50%">
+            <stop offset="0%" stopColor="rgba(255,255,255,0.2)" />
+            <stop offset="100%" stopColor="rgba(255,255,255,0)" />
+          </radialGradient>
+        </defs>
+        {activeNode && activeAnchor ? (
+          <circle cx={activeAnchor.x} cy={activeAnchor.y} r={Math.max(activeNode.w, activeNode.h) * 0.62} fill="url(#tag-atlas-glow)" opacity="0.24" />
+        ) : null}
+        {visibleConnections.map(({ node, related }) => {
+          const from = activeAnchor;
+          const to = anchors[node.entry.tag];
+          if (!from || !to) return null;
+          const strength = related.shared_count / maxShared;
+          return (
+            <g key={`${activeTag}:${node.entry.tag}`}>
+              <motion.line
+                x1={from.x}
+                y1={from.y}
+                x2={to.x}
+                y2={to.y}
+                stroke={node.accent}
+                strokeWidth={0.35 + strength * 0.55}
+                strokeOpacity={0.05 + strength * 0.12}
+                strokeLinecap="round"
+                vectorEffect="non-scaling-stroke"
+                initial={reducedMotion ? undefined : { pathLength: 0, opacity: 0 }}
+                animate={reducedMotion ? undefined : { pathLength: 1, opacity: 1 }}
+                transition={{ duration: 0.32, ease: "easeOut" }}
+              />
+              {!reducedMotion ? (
+                <motion.line
+                  x1={from.x}
+                  y1={from.y}
+                  x2={to.x}
+                  y2={to.y}
+                  stroke={node.accent}
+                  strokeWidth={0.65 + strength * 0.5}
+                  strokeOpacity={0.16 + strength * 0.1}
+                  strokeLinecap="round"
+                  pathLength={1}
+                  strokeDasharray="0.08 1"
+                  vectorEffect="non-scaling-stroke"
+                  initial={{ strokeDashoffset: 1.08, opacity: 0 }}
+                  animate={{ strokeDashoffset: [1.08, 0], opacity: [0, 0.65, 0] }}
+                  transition={{
+                    duration: 4.1 + seeded(node.index + 307) * 1.2,
+                    repeat: Infinity,
+                    ease: "easeInOut",
+                    delay: seeded(node.index + 317) * 0.75,
+                  }}
+                />
+              ) : null}
+            </g>
+          );
+        })}
+      </svg>
+      {nodes.map((node) => {
+        const isActive = activeTag === node.entry.tag;
+        const connectedRelated = connectedByTag.get(node.entry.tag);
+        const isRelated = connectedRelated !== undefined;
+        const dimmed = activeTag !== null && !isActive && !isRelated;
+        const opacity = dimmed ? 0.2 : minOpacity + node.ratio * (1 - minOpacity);
+        return (
+          <Tooltip
+            key={node.entry.tag}
+            label={`${node.entry.tag} — ${node.entry.count.toLocaleString()} ${node.entry.count === 1 ? "image" : "images"}`}
+            followCursor
+            delay={250}
+          >
+            <button
+              ref={(element) => setButtonRef(node.entry.tag, element)}
+              className={`explore-tag-word group absolute inline-flex items-center justify-center rounded-full px-2 py-1 text-center transition-[opacity,transform] duration-300 ease-out before:absolute before:inset-x-[-14px] before:inset-y-[-8px] before:rounded-full before:bg-[radial-gradient(ellipse_at_center,rgba(255,255,255,0.16),rgba(255,255,255,0.06)_46%,rgba(255,255,255,0)_72%)] before:opacity-0 before:blur-md before:transition-opacity before:duration-300 before:content-[''] hover:before:opacity-100 focus:outline-none focus-visible:ring-2 focus-visible:ring-white/25 ${
+                isActive ? "before:opacity-100" : ""
+              }`}
+              style={{
+                left: node.x - node.w / 2,
+                top: node.y - node.h / 2,
+                width: node.w,
+                minHeight: node.h,
+                fontSize: node.fontSize,
+                color: node.ratio > 0.55 ? node.accent : isLight ? "#4b5563" : "rgba(255,255,255,0.82)",
+                opacity,
+                transform: `translate3d(0, 0, 0) scale(${isActive ? 1.045 : isRelated ? 1.015 : 1})`,
+                zIndex: isActive ? 30 : isRelated ? 20 : Math.round(node.ratio * 10),
+              }}
+              onMouseEnter={() => setActiveTag(node.entry.tag)}
+              onFocus={() => setActiveTag(node.entry.tag)}
+              onMouseLeave={() => setActiveTag(null)}
+              onBlur={() => setActiveTag(null)}
+              onClick={() => onSearch(node.entry.tag)}
+            >
+              <span className="relative z-10 block w-full truncate text-center font-medium leading-none">{node.entry.tag}</span>
+              <span
+                className={`absolute left-1/2 top-full z-10 mt-1 shrink-0 -translate-x-1/2 rounded-full px-1.5 py-0.5 text-[9px] tabular-nums shadow-sm backdrop-blur-sm transition-opacity ${
+                  isActive || isRelated ? "opacity-100" : "opacity-0 group-hover:opacity-100"
+                }`}
+                style={{ backgroundColor: `${node.accent}1A`, color: node.accent }}
+              >
+                {connectedRelated ? connectedRelated.shared_count.toLocaleString() : node.entry.count.toLocaleString()}
+              </span>
+            </button>
+          </Tooltip>
+        );
+      })}
+    </div>
   );
 }
 
@@ -290,6 +592,33 @@ function Spinner() {
   );
 }
 
+function ExploreLoadingPanel({ mode }: { mode: ExploreMode }) {
+  const title = mode === "visual" ? "Building visual clusters" : "Reading tag frequencies";
+  const subtitle =
+    mode === "visual"
+      ? "Grouping similar images into browsable clusters."
+      : "Collecting tags from the current library scope.";
+
+  return (
+    <div className="flex flex-1 items-center justify-center px-8">
+      <div className="flex max-w-sm flex-col items-center text-center">
+        <div className="mb-4 flex items-center justify-center gap-3 text-white/65">
+          <Spinner />
+          <span className="text-sm font-medium">{title}</span>
+        </div>
+        <p className="text-sm leading-relaxed text-white/25">{subtitle}</p>
+        <div className="mt-6 h-px w-40 overflow-hidden rounded-full bg-white/[0.06]">
+          <motion.div
+            className="h-full w-16 rounded-full bg-white/25"
+            animate={{ x: [-72, 184] }}
+            transition={{ duration: 1.4, repeat: Infinity, ease: "easeInOut" }}
+          />
+        </div>
+      </div>
+    </div>
+  );
+}
+
 // Separate component so its useLayoutEffect fires when the canvas is actually
 // mounted — not at TagCloud mount time when the container may still be hidden
 // behind a loading state.
@@ -502,6 +831,7 @@ export function TagCloud() {
   const exploreTagEntries = useGalleryStore((state) => state.exploreTagEntries);
   const exploreTagLoading = useGalleryStore((state) => state.exploreTagLoading);
   const loadExploreTags = useGalleryStore((state) => state.loadExploreTags);
+  const loadRelatedTags = useGalleryStore((state) => state.loadRelatedTags);
   const showVisualCluster = useGalleryStore((state) => state.showVisualCluster);
   const searchForTag = useGalleryStore((state) => state.searchForTag);
   const renameTag = useGalleryStore((state) => state.renameTag);
@@ -515,17 +845,10 @@ export function TagCloud() {
     else void loadExploreTags();
   }, [exploreMode, selectedFolderId, loadTagCloud, loadExploreTags]);
 
-  const { logMin, logRange } = useMemo(() => {
-    if (!exploreTagEntries.length) return { logMin: 0, logRange: 1 };
-    const logs = exploreTagEntries.map((e) => Math.log(Math.max(e.count, 1)));
-    const lo = Math.min(...logs);
-    const hi = Math.max(...logs);
-    return { logMin: lo, logRange: hi - lo || 1 };
-  }, [exploreTagEntries]);
-
   const loading = exploreMode === "visual" ? tagCloudLoading : exploreTagLoading;
   const hasEntries = exploreMode === "visual" ? tagCloudEntries.length > 0 : exploreTagEntries.length > 0;
   const entryCount = exploreMode === "visual" ? tagCloudEntries.length : exploreTagEntries.length;
+  const visibleTagCount = Math.min(exploreTagEntries.length, TAG_ATLAS_MAX_VISIBLE);
 
   return (
     <div className="explore-view flex min-h-0 flex-1 flex-col overflow-hidden bg-[radial-gradient(ellipse_at_top,rgba(59,130,246,0.08),transparent_50%),radial-gradient(ellipse_at_80%_75%,rgba(168,85,247,0.07),transparent_40%),#07080f]">
@@ -541,7 +864,9 @@ export function TagCloud() {
                 : hasEntries
                   ? exploreMode === "visual"
                     ? `${entryCount} cluster${entryCount !== 1 ? "s" : ""} — click any to open`
-                    : `${entryCount} tag${entryCount !== 1 ? "s" : ""} — click any to search`
+                    : visibleTagCount < entryCount
+                      ? `${visibleTagCount} of ${entryCount} tags shown — click any to search`
+                      : `${entryCount} tag${entryCount !== 1 ? "s" : ""} — click any to search`
                   : exploreMode === "visual"
                     ? "No clusters — images need embeddings first"
                     : "No tags — run the AI tagger or add tags manually"}
@@ -583,11 +908,8 @@ export function TagCloud() {
         </div>
       </div>
 
-      {loading ? (
-        <div className="explore-empty flex flex-1 items-center justify-center gap-3 text-white/25">
-          <Spinner />
-          <span className="text-sm">{exploreMode === "visual" ? "Computing clusters…" : "Loading tags…"}</span>
-        </div>
+      {loading && !hasEntries ? (
+        <ExploreLoadingPanel mode={exploreMode} />
       ) : !hasEntries ? (
         <div className="flex flex-1 items-center justify-center px-8">
           <p className="explore-empty max-w-xs text-center text-sm leading-relaxed text-white/25">
@@ -597,30 +919,20 @@ export function TagCloud() {
           </p>
         </div>
       ) : exploreMode === "visual" ? (
-        <ClusterCloud entries={tagCloudEntries} onOpen={showVisualCluster} />
-      ) : manageTags ? (
-        <TagManageList
-          entries={exploreTagEntries}
-          onSearch={searchForTag}
-          onRename={renameTag}
-          onDelete={handleDeleteTag}
-        />
-      ) : (
-        /* Tag cloud — words sized by log-scaled frequency, wrapped freely */
-        <div className="overflow-y-auto px-8 py-8">
-          <div className="flex flex-wrap items-center justify-center gap-x-0.5 gap-y-1 leading-none">
-            {exploreTagEntries.map((entry, index) => (
-              <TagWord
-                key={entry.tag}
-                entry={entry}
-                index={index}
-                logMin={logMin}
-                logRange={logRange}
-                onSearch={searchForTag}
-              />
-            ))}
-          </div>
+        <div className="relative flex min-h-0 flex-1 flex-col">
+          <ClusterCloud entries={tagCloudEntries} onOpen={showVisualCluster} />
         </div>
+      ) : manageTags ? (
+        <div className="relative flex min-h-0 flex-1 flex-col overflow-hidden">
+          <TagManageList
+            entries={exploreTagEntries}
+            onSearch={searchForTag}
+            onRename={renameTag}
+            onDelete={handleDeleteTag}
+          />
+        </div>
+      ) : (
+        <TagAtlas entries={exploreTagEntries} onSearch={searchForTag} loadRelatedTags={loadRelatedTags} />
       )}
     </div>
   );

src/dev/mockBackend.ts

@@ -241,7 +241,21 @@ export async function handleMockCommand(cmd: string, payload?: unknown): Promise
     case "get_tag_cloud":
       return db.scenario === "empty" ? [] : db.tagCloud;
     case "get_explore_tags":
-      return db.scenario === "empty" ? [] : db.exploreTags.slice(0, Number(p.limit ?? 48));
+      return db.scenario === "empty" ? [] : db.exploreTags.slice(0, Number(p.limit ?? 180));
+    case "get_related_tags": {
+      const relatedCounts = new Map<string, number>();
+      for (const imageTags of Object.values(db.tagsByImageId)) {
+        if (!imageTags.some((tag) => tag.tag === p.tag)) continue;
+        for (const tag of imageTags) {
+          if (tag.tag === p.tag) continue;
+          relatedCounts.set(tag.tag, (relatedCounts.get(tag.tag) ?? 0) + 1);
+        }
+      }
+      return Array.from(relatedCounts.entries())
+        .map(([tag, shared_count]) => ({ tag, shared_count }))
+        .sort((left, right) => right.shared_count - left.shared_count || left.tag.localeCompare(right.tag))
+        .slice(0, Number(p.limit ?? 18));
+    }
     case "suggest_image_tags":
       return ["select", "warm light"];
     case "rename_tag":

src/dev/mockFixtures.ts

@@ -57,6 +57,68 @@ const tags = [
   "blue hour",
   "select",
 ];
+
+const hugeTagThemes = [
+  "alpine",
+  "archive",
+  "botanical",
+  "cinematic",
+  "coastal",
+  "editorial",
+  "industrial",
+  "interior",
+  "macro",
+  "night",
+  "portrait",
+  "street",
+  "travel",
+  "urban",
+  "wildlife",
+  "workspace",
+];
+
+const hugeTagSubjects = [
+  "glass",
+  "steel",
+  "water",
+  "stone",
+  "mist",
+  "foliage",
+  "market",
+  "signage",
+  "neon",
+  "shadow",
+  "reflection",
+  "texture",
+  "silhouette",
+  "motion",
+  "symmetry",
+  "detail",
+  "warm light",
+  "blue hour",
+  "gold accent",
+  "soft focus",
+  "hard light",
+  "negative space",
+  "foreground",
+  "background",
+  "wide angle",
+  "close crop",
+  "environment",
+  "still life",
+  "natural light",
+  "available light",
+];
+
+const hugeTags = [
+  ...tags,
+  ...Array.from({ length: hugeTagThemes.length * hugeTagSubjects.length }, (_, index) => {
+    const theme = hugeTagThemes[index % hugeTagThemes.length];
+    const subject = hugeTagSubjects[Math.floor(index / hugeTagThemes.length) % hugeTagSubjects.length];
+    return `${theme} ${subject}`;
+  }),
+  ...Array.from({ length: 320 }, (_, index) => `fixture concept ${String(index + 1).padStart(3, "0")}`),
+];
 const aiRatings: AiRating[] = ["general", "sensitive", "questionable"];
 
 function daysAgo(days: number): string {
@@ -136,17 +198,23 @@ function makeImages(scenario: MockScenario, folders: Folder[]): ImageRecord[] {
   return images;
 }
 
-function makeTags(images: ImageRecord[]): Record<number, ImageTag[]> {
+function tagVocabularyForScenario(scenario: MockScenario): string[] {
+  return scenario === "huge" ? hugeTags : tags;
+}
+
+function makeTags(images: ImageRecord[], scenario: MockScenario): Record<number, ImageTag[]> {
+  const vocabulary = tagVocabularyForScenario(scenario);
+  const tagCount = scenario === "huge" ? 9 : 3;
   return Object.fromEntries(
     images.map((image, index) => [
       image.id,
-      [0, 1, 2].map((offset) => ({
+      Array.from({ length: tagCount }, (_, offset) => ({
         id: image.id * 10 + offset,
         image_id: image.id,
-        tag: tags[(index + offset) % tags.length],
+        tag: vocabulary[(index * (offset + 3) + offset * 29) % vocabulary.length],
         source: offset === 0 ? "user" : "ai",
         ai_model: offset === 0 ? null : "wd-vit-tagger-v3",
-        confidence: offset === 0 ? null : 0.72 + offset * 0.07,
+        confidence: offset === 0 ? null : Math.min(0.99, 0.72 + offset * 0.03),
         created_at: daysAgo(index + offset),
       })),
     ]),
@@ -197,16 +265,18 @@ function makeTagCloud(images: ImageRecord[]): TagCloudEntry[] {
   });
 }
 
-function makeExploreTags(images: ImageRecord[]): ExploreTagEntry[] {
-  return tags.map((tag, index) => {
+function makeExploreTags(images: ImageRecord[], scenario: MockScenario): ExploreTagEntry[] {
+  const vocabulary = tagVocabularyForScenario(scenario);
+  return vocabulary.map((tag, index) => {
     const representative = images[index % Math.max(images.length, 1)];
+    const divisor = scenario === "huge" ? 2 + Math.pow(index + 1, 0.58) : index + 3;
     return {
       tag,
-      count: Math.max(3, Math.round(images.length / (index + 3))),
+      count: Math.max(1, Math.round(images.length / divisor)),
       representative_image_id: representative?.id ?? index + 1,
       thumbnail_path: representative?.thumbnail_path ?? null,
     };
-  });
+  }).sort((left, right) => right.count - left.count || left.tag.localeCompare(right.tag));
 }
 
 function makeDuplicateGroups(images: ImageRecord[], scenario: MockScenario): DuplicateGroup[] {
@@ -234,9 +304,9 @@ export function createMockDb(scenario: MockScenario): MockDb {
     images,
     albums,
     albumImageIds,
-    tagsByImageId: makeTags(images),
+    tagsByImageId: makeTags(images, scenario),
     tagCloud: makeTagCloud(images),
-    exploreTags: makeExploreTags(images),
+    exploreTags: makeExploreTags(images, scenario),
     backgroundJobs: makeProgress(folders, scenario),
     duplicateGroups: makeDuplicateGroups(images, scenario),
     duplicateScannedAt: scenario === "duplicates" ? Math.floor(Date.now() / 1000) - 420 : null,

src/store.ts

@@ -217,6 +217,11 @@ export interface ExploreTagEntry {
   thumbnail_path: string | null;
 }
 
+export interface RelatedTagEntry {
+  tag: string;
+  shared_count: number;
+}
+
 export interface DuplicateGroup {
   file_hash: string;
   file_size: number;
@@ -376,6 +381,7 @@ interface GalleryState {
   exploreTagEntries: ExploreTagEntry[];
   exploreTagLoading: boolean;
   exploreTagsFolderId: number | null | undefined;
+  relatedTagsByKey: Record<string, RelatedTagEntry[]>;
   indexingProgress: Record<number, IndexProgress>;
   mediaJobProgress: Record<number, FolderJobProgress>;
   cacheDir: string;
@@ -480,8 +486,9 @@ interface GalleryState {
   closeImage: () => void;
   setView: (view: ActiveView) => void;
   setExploreMode: (mode: ExploreMode) => void;
-  loadTagCloud: () => Promise<void>;
-  loadExploreTags: () => Promise<void>;
+  loadTagCloud: (options?: { force?: boolean }) => Promise<void>;
+  loadExploreTags: (options?: { force?: boolean }) => Promise<void>;
+  loadRelatedTags: (tag: string) => Promise<RelatedTagEntry[]>;
   showVisualCluster: (imageIds: number[]) => Promise<void>;
   searchForTag: (tag: string) => void;
   loadSimilarImages: (imageId: number, folderId?: number | null, reset?: boolean, sourceFolderId?: number | null, albumId?: number | null) => Promise<void>;
@@ -615,6 +622,7 @@ const SIMILAR_DISTANCE_THRESHOLD = 0.24;
 let galleryRequestToken = 0;
 let tagCloudRequestToken = 0;
 let exploreTagRequestToken = 0;
+let exploreTagRefreshTimer: ReturnType<typeof setTimeout> | null = null;
 
 function initialAiCaptionsEnabled(): boolean {
   if (typeof window === "undefined") return false;
@@ -862,6 +870,7 @@ export const useGalleryStore = create<GalleryState>((set, get) => ({
   exploreTagEntries: [],
   exploreTagLoading: false,
   exploreTagsFolderId: undefined,
+  relatedTagsByKey: {},
   indexingProgress: {},
   mediaJobProgress: {},
   cacheDir: "",
@@ -1388,10 +1397,11 @@ export const useGalleryStore = create<GalleryState>((set, get) => ({
 
   setExploreMode: (exploreMode) => set({ exploreMode }),
 
-  loadTagCloud: async () => {
+  loadTagCloud: async (options) => {
     const { selectedFolderId, tagCloudFolderId, tagCloudLoading } = get();
+    const force = options?.force ?? false;
     // Skip if already loaded for this folder and not currently loading
-    if (!tagCloudLoading && tagCloudFolderId !== undefined && tagCloudFolderId === selectedFolderId) {
+    if (!force && !tagCloudLoading && tagCloudFolderId !== undefined && tagCloudFolderId === selectedFolderId) {
       return;
     }
     const requestToken = ++tagCloudRequestToken;
@@ -1409,19 +1419,20 @@ export const useGalleryStore = create<GalleryState>((set, get) => ({
     }
   },
 
-  loadExploreTags: async () => {
+  loadExploreTags: async (options) => {
     const { selectedFolderId, exploreTagsFolderId, exploreTagLoading } = get();
-    if (!exploreTagLoading && exploreTagsFolderId !== undefined && exploreTagsFolderId === selectedFolderId) {
+    const force = options?.force ?? false;
+    if (!force && !exploreTagLoading && exploreTagsFolderId !== undefined && exploreTagsFolderId === selectedFolderId) {
       return;
     }
     const requestToken = ++exploreTagRequestToken;
     set({ exploreTagLoading: true, exploreTagsFolderId: selectedFolderId });
     try {
       const entries = await invoke<ExploreTagEntry[]>("get_explore_tags", {
-        params: { folder_id: selectedFolderId, limit: 48 },
+        params: { folder_id: selectedFolderId, limit: 180 },
       });
       if (requestToken !== exploreTagRequestToken) return;
-      set({ exploreTagEntries: entries, exploreTagLoading: false });
+      set({ exploreTagEntries: entries, exploreTagLoading: false, relatedTagsByKey: {} });
     } catch (error) {
       if (requestToken !== exploreTagRequestToken) return;
       console.error("Failed to load explore tags:", error);
@@ -1888,6 +1899,28 @@ export const useGalleryStore = create<GalleryState>((set, get) => ({
     void invoke("set_notifications_paused", { paused }).catch(() => {});
   },
 
+  loadRelatedTags: async (tag) => {
+    const trimmed = tag.trim();
+    if (!trimmed) return [];
+
+    const { selectedFolderId, relatedTagsByKey } = get();
+    const key = `${selectedFolderId ?? "all"}:${trimmed}`;
+    if (relatedTagsByKey[key]) {
+      return relatedTagsByKey[key];
+    }
+
+    const entries = await invoke<RelatedTagEntry[]>("get_related_tags", {
+      params: { tag: trimmed, folder_id: selectedFolderId, limit: 18 },
+    });
+    set((state) => ({
+      relatedTagsByKey: {
+        ...state.relatedTagsByKey,
+        [key]: entries,
+      },
+    }));
+    return entries;
+  },
+
   setTheme: (theme) => {
     window.localStorage.setItem(THEME_KEY, theme);
     document.documentElement.dataset.theme = theme;
@@ -2887,6 +2920,18 @@ export const useGalleryStore = create<GalleryState>((set, get) => ({
 
     const unlistenThumbnails = await listen<ThumbnailBatch>("media-updated", (event) => {
       const batch = event.payload;
+      const taggingUpdated = batch.images.some((image) => image.ai_tagged_at !== null || image.ai_tagger_error !== null);
+      if (taggingUpdated) {
+        set({ exploreTagsFolderId: undefined });
+        if (get().activeView === "explore") {
+          if (!exploreTagRefreshTimer) {
+            exploreTagRefreshTimer = setTimeout(() => {
+              exploreTagRefreshTimer = null;
+              void get().loadExploreTags({ force: true });
+            }, 700);
+          }
+        }
+      }
 
       set((state) => {
         const selectedImageUpdate =