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/src/lib/components/CoverageBadge.svelte

@@ -0,0 +1,56 @@
+<script lang="ts">
+    /**
+     * Analysis-coverage badge: `analyzed/total` colored by state —
+     * green Full, amber Partial, grey None. Reused for manga and chapter
+     * rows in the admin Analysis section.
+     */
+    let {
+        analyzed,
+        total,
+        testid
+    }: { analyzed: number; total: number; testid?: string } = $props();
+
+    const state = $derived(
+        total === 0 || analyzed === 0
+            ? 'none'
+            : analyzed >= total
+              ? 'full'
+              : 'partial'
+    );
+    const word = $derived(
+        state === 'full' ? 'Full' : state === 'partial' ? 'Partial' : 'None'
+    );
+</script>
+
+<span class="badge {state}" data-testid={testid} data-state={state}>
+    {word} {analyzed}/{total}
+</span>
+
+<style>
+    .badge {
+        display: inline-flex;
+        align-items: center;
+        gap: var(--space-1);
+        font-size: var(--font-xs);
+        font-weight: var(--weight-semibold);
+        padding: 1px var(--space-2);
+        border-radius: var(--radius-pill);
+        border: 1px solid transparent;
+        white-space: nowrap;
+    }
+    .full {
+        background: color-mix(in srgb, #2e7d32 16%, transparent);
+        color: #2e7d32;
+        border-color: color-mix(in srgb, #2e7d32 40%, transparent);
+    }
+    .partial {
+        background: color-mix(in srgb, #d4762a 16%, transparent);
+        color: #b85e1a;
+        border-color: color-mix(in srgb, #d4762a 40%, transparent);
+    }
+    .none {
+        background: var(--surface-elevated);
+        color: var(--text-muted);
+        border-color: var(--border);
+    }
+</style>