Add fallback handling for missing icon files

Add graceful fallback behavior when icon image files (refresh.png, settings.png, MSMD32.png) are not found. The application now uses Unicode symbols (⟳, ⚙) as button text alternatives, preventing crashes when running without bundled assets.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

.claude/settings.local.json

@@ -6,7 +6,17 @@
       "Bash(pip install:*)",
       "Bash(python:*)",
       "Bash(git init:*)",
-      "Bash(git add:*)"
+      "Bash(git add:*)",
+      "Bash(cat:*)",
+      "Bash(git commit:*)",
+      "Bash(git push:*)",
+      "Bash(ls:*)",
+      "Bash(git tag:*)",
+      "Bash(pyinstaller:*)",
+      "Bash(open:*)",
+      "Bash(osascript:*)",
+      "Bash(killall:*)",
+      "Bash(git fetch:*)"
     ]
   }
 }