Fix: comprehensive bug review — restore refactor regressions & fix critical/major/minor bugs

Critical:
- responseExtractor.js: fix import depth (7x ../ -> 6x) that broke the module
  graph for encounters, separate/external generation, and auto-avatars
- settingsListeners.js: restore ~25 undefined functions, ~40 lost event
  bindings, and the entire 'Initialize UI state' block dropped by the c14c141
  refactor; add initializeSettingsUIState()
- Restore all External API mode handlers (base-url, api-key, model,
  max-tokens, temperature, key-visibility, test-connection) + value init
- validator.js: convert CJS->ESM (crashed under type:module), fix
  glob.sync->globSync (v13 API), fix '!key in obj' precedence bugs

Major:
- sillytavern.js: add missing updateMessageBlock import
- infoBox.js: add missing saveSettings import
- userStats.js: fix double-escaped quantity regex

Minor:
- config.js: settingsVersion 6->7, restore showLockIcons, fix apiKey comment
- events.js: off() tracking + unregister/re-register on disable/enable
- escapeHtml: escape quotes (XSS) in all 3 copies
- template.html: data-prompt dialogue-coloring -> dialogueColoring
- trackerEditor.js: stale externalApiOnly -> sendAllEnabledOnRefresh
- suppression.js: fix '[object Object]' on empty instruct value
- persistence.js: await migrateToV3JSON (loadSettings now async)
- weatherEffects.js: JSON.parse -> repairJSON
- mobile.js: fix corrupted comment line
- Add missing debugMode setting; settings.html v3.7.2 -> v3.7.4

Dead code removed:
- Unused imports/vars (promptBuilder, jsonPromptHelpers, encounterPrompts,
  injector), withChangeDetection, trackJQueryHandler/cleanupJQueryEvents,
  renderThoughtsSidebarOnly, updateCheckpointButtonInMenu, addDiceQuickReply,
  setupRefreshButtonDrag/setupDebugButtonDrag (~430 lines)

Verified: 78/78 tests pass, style.css in sync, validator runs clean.

template.html

@@ -1114,7 +1114,7 @@
                     Injected when "Enable Dialogue Coloring" is enabled. Affects all generation modes.
                 </small>
                 <textarea id="rpg-prompt-dialogue-coloring" class="rpg-prompt-textarea" rows="4"></textarea>
-                <button class="menu_button rpg-restore-prompt-btn" data-prompt="dialogue-coloring" style="margin-top: 8px;">
+                <button class="menu_button rpg-restore-prompt-btn" data-prompt="dialogueColoring" style="margin-top: 8px;">
                     <i class="fa-solid fa-rotate-left"></i>&nbsp;<span data-i18n-key="template.promptsEditor.restoreDefault">Restore Default</span>
                 </button>
             </div>