build: Update .gitignore and untrack files

Author: hgmzhn

.gitignore

@@ -77,4 +77,10 @@ logs/
 *_translations.json
 *.png
 temp_requirements.txt
-desktop_qt_ui/mypy.ini
+desktop_qt_ui/mypy.ini
+# Ignore tool-specific caches in desktop_qt_ui
+desktop_qt_ui/.ruff_cache/
+desktop_qt_ui/.claude/
+desktop_qt_ui/.mypy_cache/
+desktop_qt_ui/logs/
+.qoder/