feat: add reset button positions to settings

PROBLEM:
- Existing users with saved off-screen FAB positions can't see buttons
- No way to reset positions without clearing all extension settings
- Salixfire and other users on Xiaomi/other devices need safe positions

SOLUTION:
Added "Reset Button Positions" button in Advanced settings section

IMPLEMENTATION:

1. template.html (lines 241-249):
   - Added reset button in Advanced section after Clear Cache button
   - Blue-styled button with rotate icon
   - Help text explains it resets FAB positions to top-left

2. index.js (lines 361-390):
   - Added click handler for reset button
   - Resets all 3 FAB positions to safe top-left defaults:
     * Mobile toggle: top + 20px, left: 12px
     * Refresh: top + 80px, left: 12px
     * Debug: top + 140px, left: 12px
   - Saves settings immediately
   - Applies CSS positions to visible buttons (no page refresh needed)
   - Shows success toast notification

3. style.css (lines 2057-2083, 4123-4125):
   - Added .rpg-btn-reset-fab styles matching clear cache pattern
   - Blue color scheme (vs red for destructive clear cache)
   - Same sizing, padding, transitions as other buttons
   - Mobile responsive font-size with clamp()

USAGE:
Users experiencing off-screen buttons can now:
1. Open RPG Companion settings (gear icon)
2. Scroll to Advanced section
3. Click "Reset Button Positions"
4. All FAB buttons instantly move to safe top-left positions

This fixes the issue for Salixfire and any other users who:
- Have buttons saved in off-screen positions
- Can't scroll to find buttons
- Need to reset without clearing all settings

Works immediately without page refresh or extension reload.

index.js

@@ -358,6 +358,37 @@ async function initUI() {
         }
     });
 
+    // Reset FAB positions button
+    $('#rpg-reset-fab-positions').on('click', function() {
+        console.log('[RPG Companion] Resetting FAB positions to defaults');
+
+        // Reset to defaults (top-left stacked)
+        extensionSettings.mobileFabPosition = {
+            top: 'calc(var(--topBarBlockSize) + 20px)',
+            left: '12px'
+        };
+        extensionSettings.mobileRefreshPosition = {
+            top: 'calc(var(--topBarBlockSize) + 80px)',
+            left: '12px'
+        };
+        extensionSettings.debugFabPosition = {
+            top: 'calc(var(--topBarBlockSize) + 140px)',
+            left: '12px'
+        };
+
+        // Save settings
+        saveSettings();
+
+        // Apply positions immediately to visible buttons
+        $('#rpg-mobile-toggle').css(extensionSettings.mobileFabPosition);
+        $('#rpg-manual-update-mobile').css(extensionSettings.mobileRefreshPosition);
+        $('#rpg-debug-toggle').css(extensionSettings.debugFabPosition);
+
+        // Show success feedback
+        toastr.success('Button positions reset to defaults', 'RPG Companion');
+        console.log('[RPG Companion] FAB positions reset successfully');
+    });
+
     $('#rpg-stat-bar-color-low').on('change', function() {
         extensionSettings.statBarColorLow = String($(this).val());
         saveSettings();