chore(release): 0.1.1

Bump version to 0.1.1 (package.json, Cargo.toml, Cargo.lock), date the
changelog section (2026-06-23), and add the GitHub release-notes draft.

QoL release on top of 0.1.0: custom multi-folder picker, theme system,
timeline scrubber, folder reordering, gallery/duplicate-finder
virtualisation, video playback settings, rebuild-semantic-index action,
plus AVIF thumbnail, video-embedding, and Subtle Light theme fixes.

package.json

@@ -1,7 +1,7 @@
 {
   "name": "phokus",
   "private": true,
-  "version": "0.1.0",
+  "version": "0.1.1",
   "license": "MIT",
   "type": "module",
   "scripts": {