Add per-request AI logging, DB batch queue, WS entity updates, and UI polish

- log_thread.py: thread-safe ContextVar bridge so executor threads can log
  individual LLM calls and archive searches back to the event loop
- ai_log.py: init_thread_logging(), notify_entity_update(); WS now pushes
  entity_update messages when book data changes after any plugin or batch run
- batch.py: replace batch_pending.json with batch_queue SQLite table;
  run_batch_consumer() reads queue dynamically so new books can be added
  while batch is running; add_to_queue() deduplicates
- migrate.py: fix _migrate_v1 (clear-on-startup bug); add _migrate_v2 for
  batch_queue table
- _client.py / archive.py / identification.py: wrap each LLM API call and
  archive search with log_thread start/finish entries
- api.py: POST /api/batch returns {already_running, added}; notify_entity_update
  after identify pipeline
- models.default.yaml: strengthen ai_identify confidence-scoring instructions;
  warn against placeholder data
- detail-render.js: book log entries show clickable ID + spine thumbnail;
  book spine/title images open full-screen popup
- events.js: batch-start handles already_running+added; open-img-popup action
- init.js: entity_update WS handler; image popup close listeners
- overlays.css / index.html: full-screen image popup overlay
- eslint.config.js: add new globals; fix no-redeclare/no-unused-vars for
  multi-file global architecture; all lint errors resolved

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

static/js/state.js

@@ -7,35 +7,53 @@
  *   S              — main UI state (tree data, selection, loading flags)
  *   _plugins       — plugin manifest populated from GET /api/config
  *   _batchState    — current batch-processing progress
- *   _batchPollTimer — setInterval handle for batch polling
+ *   _batchWs       — active WebSocket for batch push notifications (null when idle)
  *   _bnd           — live boundary-canvas state (written by canvas-boundary.js,
  *                    read by detail-render.js)
  *   _photoQueue    — photo queue session state (written by photo.js,
  *                    read by events.js)
  */
 
+/* exported S */
+
 // ── Main UI state ───────────────────────────────────────────────────────────
-let S = {
+const S = {
   tree: null,
   expanded: new Set(),
-  selected: null,          // {type:'cabinet'|'shelf'|'book', id}
-  _photoTarget: null,      // {type, id}
-  _loading: {},            // {`${pluginId}:${entityId}`: true}
-  _cropMode: null,         // {type, id} while crop UI is active
+  selected: null, // {type:'cabinet'|'shelf'|'book', id}
+  _photoTarget: null, // {type, id}
+  _loading: {}, // {`${pluginId}:${entityId}`: true}
+  _cropMode: null, // {type, id} while crop UI is active
 };
 
 // ── Plugin registry ─────────────────────────────────────────────────────────
-let _plugins = [];  // populated from GET /api/config
+// eslint-disable-next-line prefer-const
+let _plugins = []; // populated from GET /api/config
 
 // ── Batch processing state ──────────────────────────────────────────────────
-let _batchState = {running: false, total: 0, done: 0, errors: 0, current: ''};
-let _batchPollTimer = null;
+const _batchState = { running: false, total: 0, done: 0, errors: 0, current: '' };
+// eslint-disable-next-line prefer-const
+let _batchWs = null;
 
 // ── Boundary canvas live state ───────────────────────────────────────────────
 // Owned by canvas-boundary.js; declared here so detail-render.js can read it
 // without a circular load dependency.
+// eslint-disable-next-line prefer-const
 let _bnd = null; // {wrap,img,canvas,axis,boundaries[],pluginResults{},selectedPlugin,segments[],nodeId,nodeType}
 
 // ── Photo queue session state ────────────────────────────────────────────────
 // Owned by photo.js; declared here so events.js can read/write it.
+// eslint-disable-next-line prefer-const
 let _photoQueue = null; // {books:[...], index:0, processing:false}
+
+// ── AI blocks visibility ─────────────────────────────────────────────────────
+// Per-book override map. If bookId is absent the default rule applies:
+//   show when not user_approved, hide when user_approved.
+const _aiBlocksVisible = {}; // {bookId: true|false}
+
+// ── AI request log ───────────────────────────────────────────────────────────
+// Populated from /ws/ai-log on page load.
+// eslint-disable-next-line prefer-const
+let _aiLog = []; // AiLogEntry[] — ring buffer, oldest first
+// eslint-disable-next-line prefer-const
+let _aiLogWs = null; // active WebSocket for AI log push (never closed)