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>

eslint.config.js

@@ -19,9 +19,12 @@ const appGlobals = {
   S: 'writable',
   _plugins: 'writable',
   _batchState: 'writable',
-  _batchPollTimer: 'writable',
+  _batchWs: 'writable',
   _bnd: 'writable',
   _photoQueue: 'writable',
+  _aiBlocksVisible: 'writable',
+  _aiLog: 'writable',
+  _aiLogWs: 'writable',
 
   // helpers.js
   esc: 'readonly',
@@ -46,6 +49,7 @@ const appGlobals = {
   isLoading: 'readonly',
   vPluginBtn: 'readonly',
   vBatchBtn: 'readonly',
+  vAiIndicator: 'readonly',
   candidateSugRows: 'readonly',
   _STATUS_BADGE: 'readonly',
   getBookStats: 'readonly',
@@ -56,6 +60,7 @@ const appGlobals = {
 
   // detail-render.js
   vDetailBody: 'readonly',
+  aiBlocksShown: 'readonly',
 
   // canvas-crop.js
   startCropMode: 'readonly',
@@ -72,7 +77,8 @@ const appGlobals = {
   // init.js
   render: 'readonly',
   renderDetail: 'readonly',
-  startBatchPolling: 'readonly',
+  connectBatchWs: 'readonly',
+  connectAiLogWs: 'readonly',
   loadTree: 'readonly',
 
   // CDN (SortableJS loaded via <script> in index.html)
@@ -96,8 +102,15 @@ export default [
       // Catch typos and missing globals
       'no-undef': 'error',
 
+      // builtinGlobals:false — only catch intra-file re-declarations, not globals
+      // from appGlobals which are intentionally re-defined in their owning file.
+      'no-redeclare': ['error', { builtinGlobals: false }],
+
       // Unused variables: allow leading-underscore convention for intentional ignores
-      'no-unused-vars': ['error', { argsIgnorePattern: '^_', varsIgnorePattern: '^_' }],
+      'no-unused-vars': [
+        'error',
+        { argsIgnorePattern: '^_', varsIgnorePattern: '^_', caughtErrorsIgnorePattern: '^_' },
+      ],
 
       // Require strict equality
       eqeqeq: ['error', 'always', { null: 'ignore' }],