style: integrate upstream font-size and layout improvements

Folds in changes from commits 6d97992, cc53c69, 6987c0c:
- Update stat label/value font sizes (clamp 0.9-1vw → 0.5-0.7vw)
- Update inventory items font size (clamp 0.4-0.6vw → 0.7-0.6vw)
- Center dice save button with auto margins
- Add debug console.log for committedTrackerData
- Comment out verbose console logs for plot progression and persona avatar
- Clarify prompt instruction to remove brackets

src/systems/generation/injector.js

@@ -32,6 +32,7 @@ export function onGenerationStarted(type, data) {
     // console.log('[RPG Companion] enabled:', extensionSettings.enabled);
     // console.log('[RPG Companion] generationMode:', extensionSettings.generationMode);
     // console.log('[RPG Companion] ⚡ EVENT: onGenerationStarted - lastActionWasSwipe =', lastActionWasSwipe, '| isGenerating =', isGenerating);
+    // console.log('[RPG Companion] Committed Prompt:', committedTrackerData);
 
     // Skip tracker injection for image generation requests
     if (data?.quietImage) {