refactor(features): extract HTML cleaning regex setup to standalone module

Extract ensureHtmlCleaningRegex into src/systems/features/htmlCleaning.js.
This module automatically imports the HTML cleaning regex script that
strips HTML tags from outgoing prompts to prevent formatting issues.

Passes SillyTavern imports (st_extension_settings, saveSettingsDebounced)
as parameters to avoid deep module import path issues.

- Create htmlCleaning.js with regex import logic
- Update index.js to import and use the new module with parameters
- Maintain backward compatibility with existing functionality

index.js

@@ -97,6 +97,7 @@ import {
 // Feature modules
 import { setupPlotButtons } from './src/systems/features/plotProgression.js';
 import { setupClassicStatsButtons } from './src/systems/features/classicStats.js';
+import { ensureHtmlCleaningRegex } from './src/systems/features/htmlCleaning.js';
 
 // Old state variable declarations removed - now imported from core modules
 // (extensionSettings, lastGeneratedData, committedTrackerData, etc. are now in src/core/state.js)
@@ -711,64 +712,6 @@ function onMessageSwiped(messageIndex) {
     updateChatThoughts();
 }
 
-/**
- * Automatically imports the HTML cleaning regex script if it doesn't already exist.
- * This regex removes HTML tags from outgoing prompts to prevent formatting issues.
- */
-async function ensureHtmlCleaningRegex() {
-    try {
-        // Check if the HTML cleaning regex already exists
-        const scriptName = 'Clean HTML (From Outgoing Prompt)';
-        const existingScripts = st_extension_settings?.regex || [];
-        const alreadyExists = existingScripts.some(script => script.scriptName === scriptName);
-
-        if (alreadyExists) {
-            console.log('[RPG Companion] HTML cleaning regex already exists, skipping import');
-            return;
-        }
-
-        // Generate a UUID for the script
-        const uuidv4 = () => {
-            return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
-                const r = Math.random() * 16 | 0;
-                const v = c === 'x' ? r : (r & 0x3 | 0x8);
-                return v.toString(16);
-            });
-        };
-
-        // Create the regex script object based on the attached file
-        const regexScript = {
-            id: uuidv4(),
-            scriptName: scriptName,
-            findRegex: '/\\s?<(?!\\!--)(?:\"[^\"]*\"|\'[^\']*\'|[^\'\">])*>/g',
-            replaceString: '',
-            trimStrings: [],
-            placement: [2], // 2 = Input (affects outgoing prompt)
-            disabled: false,
-            markdownOnly: false,
-            promptOnly: true,
-            runOnEdit: true,
-            substituteRegex: 0,
-            minDepth: null,
-            maxDepth: null
-        };
-
-        // Add to global regex scripts
-        if (!Array.isArray(st_extension_settings.regex)) {
-            st_extension_settings.regex = [];
-        }
-
-        st_extension_settings.regex.push(regexScript);
-
-        // Save the changes using the already-imported function
-        saveSettingsDebounced();
-
-        console.log('[RPG Companion] ✅ HTML cleaning regex imported successfully');
-    } catch (error) {
-        console.error('[RPG Companion] Failed to import HTML cleaning regex:', error);
-        // Don't throw - this is a nice-to-have feature
-    }
-}
 
 /**
  * Update the persona avatar image when user switches personas
@@ -817,7 +760,7 @@ jQuery(async () => {
         loadChatData();
 
         // Import the HTML cleaning regex if needed
-        await ensureHtmlCleaningRegex();
+        await ensureHtmlCleaningRegex(st_extension_settings, saveSettingsDebounced);
 
         // Register event listeners
         eventSource.on(event_types.MESSAGE_SENT, onMessageSent);