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.

src/core/settingsPanel.js

@@ -25,8 +25,11 @@ import { i18n } from './i18n.js';
  * @param {Function} injectCheckpointButton - Add checkpoint buttons
  * @param {Function} updateAllCheckpointIndicators - Update checkpoint button states
  * @param {Function} removeAlternatePresentCharactersPanel - Remove alt characters panel
+ * @param {Function} registerExtensionEvents - (Re)register all SillyTavern event handlers
+ * @param {Function} unregisterAllEvents - Unregister all tracked SillyTavern event handlers
+ * @param {Function} initHistoryInjection - (Re)register history injection listeners
  */
-export async function addExtensionSettings($, renderExtensionTemplateAsync, clearExtensionPrompts, updateChatThoughts, cleanupCheckpointUI, clearThoughtBasedExpressionsCache, toggleDynamicWeather, initUI, loadChatData, scheduleChatStateRehydration, initThoughtBasedExpressions, injectCheckpointButton, updateAllCheckpointIndicators, removeAlternatePresentCharactersPanel) {
+export async function addExtensionSettings($, renderExtensionTemplateAsync, clearExtensionPrompts, updateChatThoughts, cleanupCheckpointUI, clearThoughtBasedExpressionsCache, toggleDynamicWeather, initUI, loadChatData, scheduleChatStateRehydration, initThoughtBasedExpressions, injectCheckpointButton, updateAllCheckpointIndicators, removeAlternatePresentCharactersPanel, registerExtensionEvents, unregisterAllEvents, initHistoryInjection) {
     const settingsHtml = await renderExtensionTemplateAsync(extensionName, 'settings');
     $('#extensions_settings2').append(settingsHtml);
 
@@ -43,12 +46,18 @@ export async function addExtensionSettings($, renderExtensionTemplateAsync, clea
             clearThoughtBasedExpressionsCache();
             toggleDynamicWeather(false);
 
+            // Unregister all tracked event handlers to avoid leaks while disabled
+            unregisterAllEvents();
+
             $('#rpg-companion-panel').remove();
             $('#rpg-mobile-toggle').remove();
             $('#rpg-collapse-toggle').remove();
             $('#rpg-plot-buttons').remove();
             removeAlternatePresentCharactersPanel();
         } else if (extensionSettings.enabled && !wasEnabled) {
+            // Re-register event handlers that were unregistered on disable
+            registerExtensionEvents();
+            initHistoryInjection();
             await initUI();
             loadChatData();
             scheduleChatStateRehydration();