feat(analysis): admin coverage overview + per-page result inspector UI

Reworks /admin/analysis from a blind enqueue form into a coverage browser:

- Loads a paginated overview of mangas with a CoverageBadge
  (Full/Partial/None, analyzed/total) per row; debounced search filters it.
- Drill manga → chapters (coverage badge each) → page grid (chips colored
  done/queued/failed/none) with a legend.
- Click a page chip → Modal showing the full result: status, model, time,
  NSFW + content-warning chips, scene description, tags, and OCR lines
  (labeled by kind). Unanalyzed/failed pages get a "Queue this page"
  action (force re-analyze).
- Keeps "Queue all" + per-manga/chapter enqueue and the include-analyzed
  toggle; enqueue refreshes the open chapter's grid so queued pages show.

API client: getAnalysisMangaCoverage / ChapterCoverage / ChapterPages /
PageDetail + types. New CoverageBadge component.

Tests: vitest for the four clients; Playwright for overview+badges+queue-all,
drill+inspect, and queue-from-detail. svelte-check + build clean; 266 vitest.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend/package.json

@@ -1,6 +1,6 @@
 {
   "name": "mangalord-frontend",
-  "version": "0.75.0",
+  "version": "0.76.0",
   "private": true,
   "type": "module",
   "scripts": {