Add preset switching feature and clean up console logs

- Add 'Use separate preset for tracker generation' setting
- Implement automatic preset switching using /preset slash command
- Import getCurrentPresetName() from SillyTavern's regex engine
- Automatically import 'RPG Companion Trackers' preset on first load
- Comment out non-essential console.log statements
- Keep initialization, error, and migration logs for debugging

src/core/persistence.js

@@ -64,7 +64,7 @@ export function loadSettings() {
 
         if (!power_user.extensions) {
             power_user.extensions = {};
-            console.log('[RPG Companion] Created power_user.extensions object');
+            // console.log('[RPG Companion] Created power_user.extensions object');
         }
 
         if (power_user.extensions[extensionName]) {