feat(search): tag-based page search surface + per-page tags & collections

Add the /search surface (Pages / Chapters / Mangas tabs) backed by
per-user page tags and per-page collections: schema (migration 0023),
backend endpoints for page tags/collections and tagged-page aggregations
(with the OCR text-search param reserved at 501), plus the frontend API
clients, library Page-tags tab, collection page sections, page context
menu / AddTagsSheet, and reader long-press wiring. Includes the
continuous-reader navigation fixes (?page=N handling, chapter-reset
timing, back-button pops history) and tag-normalization hardening
accumulated on the branch.

Bump version 0.60.2 -> 0.62.0.

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

frontend/src/routes/library/+page.ts

@@ -2,15 +2,19 @@ import { ApiError } from '$lib/api/client';
 import { listMyBookmarks } from '$lib/api/bookmarks';
 import { listMyCollections } from '$lib/api/collections';
 import { listMyReadProgress } from '$lib/api/read_progress';
+import {
+    listMyPageTags,
+    listMyDistinctPageTags
+} from '$lib/api/page_tags';
 import type { PageLoad } from './$types';
 
 export const ssr = false;
 
 /**
- * Loads bookmarks + collections + reading-history in one shot so the
- * Library segmented control can swap between sub-tabs without firing a
- * second round trip per tap. 401 → unauthenticated path; the page
- * surfaces a sign-in prompt and renders empty lists.
+ * Loads bookmarks + collections + history + page-tags in one shot so
+ * the Library segmented control can swap between sub-tabs without
+ * firing a second round trip per tap. 401 → unauthenticated path; the
+ * page surfaces a sign-in prompt and renders empty lists.
  */
 export const load: PageLoad = async () => {
     const empty = {
@@ -18,19 +22,26 @@ export const load: PageLoad = async () => {
         bookmarks: [] as Awaited<ReturnType<typeof listMyBookmarks>>['items'],
         collections: [] as Awaited<ReturnType<typeof listMyCollections>>['items'],
         history: [] as Awaited<ReturnType<typeof listMyReadProgress>>['items'],
+        pageTags: [] as Awaited<ReturnType<typeof listMyPageTags>>['items'],
+        distinctPageTags: [] as Awaited<ReturnType<typeof listMyDistinctPageTags>>,
         error: null as string | null
     };
     try {
-        const [bookmarks, collections, history] = await Promise.all([
-            listMyBookmarks(),
-            listMyCollections({ limit: 200 }),
-            listMyReadProgress({ limit: 100 })
-        ]);
+        const [bookmarks, collections, history, pageTags, distinctPageTags] =
+            await Promise.all([
+                listMyBookmarks(),
+                listMyCollections({ limit: 200 }),
+                listMyReadProgress({ limit: 100 }),
+                listMyPageTags({ limit: 100 }),
+                listMyDistinctPageTags(undefined, 100)
+            ]);
         return {
             ...empty,
             bookmarks: bookmarks.items,
             collections: collections.items,
-            history: history.items
+            history: history.items,
+            pageTags: pageTags.items,
+            distinctPageTags
         };
     } catch (e) {
         if (e instanceof ApiError && e.status === 401) {