feat: enhance white balance interface with expandable help content

- Add comprehensive expandable help section in normal mode with detailed instructions
- Include usage recommendations, adjustment tips, and comparison methods
- Add simplified tooltip in fullscreen mode for quick reference
- Improve user guidance for LED strip color calibration process
- Maintain dual-mode functionality (normal/fullscreen) with appropriate help content

src-tauri/capabilities/default.json

@@ -5,6 +5,8 @@
   "windows": ["main"],
   "permissions": [
     "core:default",
-    "shell:allow-open"
+    "shell:allow-open",
+    "core:window:allow-set-fullscreen",
+    "core:window:allow-is-fullscreen"
   ]
 }