test(frontend): cover mediaSrc, changelog, and timeline grouping

Unit tests for three previously-untested pure functions: mediaSrc's
UI Lab path handling, getChangelogForVersion's version normalization,
and groupImages' date bucketing/sorting.

src/changelog.test.ts

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+import { describe, expect, it } from 'vitest'
+import { getChangelogForVersion } from './changelog'
+
+describe('getChangelogForVersion', () => {
+  it('returns null for a null/undefined version', () => {
+    expect(getChangelogForVersion(null)).toBeNull()
+    expect(getChangelogForVersion(undefined)).toBeNull()
+  })
+
+  it('never surfaces the in-progress Unreleased section', () => {
+    expect(getChangelogForVersion('Unreleased')).toBeNull()
+    expect(getChangelogForVersion('unreleased')).toBeNull()
+  })
+
+  it('returns null for a version with no matching entry', () => {
+    expect(getChangelogForVersion('99.9.9')).toBeNull()
+  })
+
+  it('resolves a plain released version', () => {
+    const entry = getChangelogForVersion('0.1.1')
+    expect(entry?.version).toBe('0.1.1')
+    expect(entry?.date).toBe('2026-06-23')
+  })
+
+  it('strips a leading "v" from the version string', () => {
+    expect(getChangelogForVersion('v0.1.1')?.version).toBe('0.1.1')
+  })
+
+  it('strips dev/UI-lab build suffixes so they resolve to the base version', () => {
+    expect(getChangelogForVersion('0.1.1-dev')?.version).toBe('0.1.1')
+    expect(getChangelogForVersion('0.1.1-ui')?.version).toBe('0.1.1')
+    expect(getChangelogForVersion('0.1.1-beta.1')?.version).toBe('0.1.1')
+  })
+})

src/components/timeline/timelineModel.test.ts

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+import { describe, expect, it } from 'vitest'
+import { makeImage } from '../../test/factories'
+import { groupImages } from './timelineModel'
+
+describe('groupImages', () => {
+  it('buckets images by year-month, preferring taken_at over modified_at', () => {
+    const groups = groupImages([
+      makeImage({ id: 1, taken_at: '2026-03-05T00:00:00Z', modified_at: '2026-01-01T00:00:00Z' }),
+      makeImage({ id: 2, taken_at: null, modified_at: '2026-03-20T00:00:00Z' }),
+    ])
+
+    expect(groups).toHaveLength(1)
+    expect(groups[0].key).toBe('2026-03')
+    expect(groups[0].images.map((i) => i.id)).toEqual([1, 2])
+  })
+
+  it('sorts groups chronologically ascending', () => {
+    const groups = groupImages([
+      makeImage({ id: 1, taken_at: '2026-06-01T00:00:00Z' }),
+      makeImage({ id: 2, taken_at: '2026-01-01T00:00:00Z' }),
+      makeImage({ id: 3, taken_at: '2026-03-01T00:00:00Z' }),
+    ])
+
+    expect(groups.map((g) => g.key)).toEqual(['2026-01', '2026-03', '2026-06'])
+  })
+
+  it('buckets images with no date under "unknown" and sorts it last', () => {
+    const groups = groupImages([
+      makeImage({ id: 1, taken_at: null, modified_at: null }),
+      makeImage({ id: 2, taken_at: '2026-01-01T00:00:00Z' }),
+    ])
+
+    expect(groups.map((g) => g.key)).toEqual(['2026-01', 'unknown'])
+    expect(groups[1].label).toBe('Unknown Date')
+  })
+
+  it('returns no groups for an empty image list', () => {
+    expect(groupImages([])).toEqual([])
+  })
+})

src/lib/mediaSrc.test.ts

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+import { afterEach, describe, expect, it, vi } from 'vitest'
+
+vi.mock('@tauri-apps/api/core', () => ({
+  convertFileSrc: (path: string) => `asset://localhost/${path}`,
+}))
+
+import { mediaSrc } from './mediaSrc'
+
+afterEach(() => {
+  vi.unstubAllEnvs()
+})
+
+describe('mediaSrc', () => {
+  it('returns null for a null path', () => {
+    expect(mediaSrc(null)).toBeNull()
+  })
+
+  it('delegates to convertFileSrc outside UI Lab mode', () => {
+    expect(mediaSrc('C:/media/image.jpg')).toBe('asset://localhost/C:/media/image.jpg')
+  })
+
+  it('passes through absolute/http paths unchanged in UI Lab mode', () => {
+    vi.stubEnv('MODE', 'ui')
+    expect(mediaSrc('/dev-media/image.jpg')).toBe('/dev-media/image.jpg')
+    expect(mediaSrc('http://example.com/image.jpg')).toBe('http://example.com/image.jpg')
+  })
+
+  it('rewrites mock:// paths to /dev-media/ in UI Lab mode', () => {
+    vi.stubEnv('MODE', 'ui')
+    expect(mediaSrc('mock://folder/image.jpg')).toBe('/dev-media/folder/image.jpg')
+  })
+
+  it('falls back to convertFileSrc for other paths in UI Lab mode', () => {
+    vi.stubEnv('MODE', 'ui')
+    expect(mediaSrc('C:/media/image.jpg')).toBe('asset://localhost/C:/media/image.jpg')
+  })
+})