fix: restore proper spinning animation for mobile refresh FAB

Reverted HTML replacement approach and restored the cleaner CSS-based
animation from commit 1855085.

Previous (wrong) approach:
- Replaced button HTML with spinner
- Modified both desktop and mobile buttons in apiClient.js
- Messy and inconsistent

Restored (correct) approach:
- Add/remove .spinning CSS class in click handler
- CSS animates only the icon inside the button
- Button itself stays unchanged
- Much cleaner implementation

Changes:
- Reverted apiClient.js changes from commit 9a49433
- Added .spinning CSS class and @keyframes rpg-spin
- Updated index.js click handler to bind both buttons
- Uses addClass/removeClass for clean animation control
- Includes drag detection to prevent accidental clicks

Now the mobile FAB icon spins smoothly when refreshing!

src/systems/generation/apiClient.js

@@ -97,16 +97,11 @@ export async function updateRPGData(renderUserStats, renderInfoBox, renderThough
     try {
         setIsGenerating(true);
 
-        // Update desktop button to show "Updating..." state
+        // Update button to show "Updating..." state
         const $updateBtn = $('#rpg-manual-update');
         const originalHtml = $updateBtn.html();
         $updateBtn.html('<i class="fa-solid fa-spinner fa-spin"></i> Updating...').prop('disabled', true);
 
-        // Update mobile FAB to show spinner (icon only)
-        const $updateBtnMobile = $('#rpg-manual-update-mobile');
-        const originalHtmlMobile = $updateBtnMobile.html();
-        $updateBtnMobile.html('<i class="fa-solid fa-spinner fa-spin"></i>').prop('disabled', true);
-
         // Save current preset name before switching (if we're going to switch)
         if (extensionSettings.useSeparatePreset) {
             originalPresetName = await getCurrentPresetName();
@@ -224,14 +219,10 @@ export async function updateRPGData(renderUserStats, renderInfoBox, renderThough
 
         setIsGenerating(false);
 
-        // Restore desktop button to original state
+        // Restore button to original state
         const $updateBtn = $('#rpg-manual-update');
         $updateBtn.html('<i class="fa-solid fa-sync"></i> Refresh RPG Info').prop('disabled', false);
 
-        // Restore mobile FAB to original state (icon only)
-        const $updateBtnMobile = $('#rpg-manual-update-mobile');
-        $updateBtnMobile.html('<i class="fa-solid fa-sync"></i>').prop('disabled', false);
-
         // Reset the flag after tracker generation completes
         // This ensures the flag persists through both main generation AND tracker generation
         // console.log('[RPG Companion] 🔄 Tracker generation complete - resetting lastActionWasSwipe to false');