feat: add theme management with light and dark modes

- Implemented a new composable `useTheme` for managing theme state.
- Added functions to read and write theme preference to local storage.
- Applied theme styles to the DOM based on user preference.
- Introduced a toggle function to switch between light and dark themes.

refactor: enhance copilot plugin functionality

- Improved request handling with sequence and document versioning.
- Refactored ghost text handling to improve clarity and efficiency.
- Updated markdown insertion logic to handle parsed content more robustly.
- Enhanced error handling and logging for better debugging.

style: update global styles for light and dark themes

- Defined CSS variables for light and dark themes to streamline styling.
- Improved overall styling consistency and responsiveness.
- Added transitions for smoother theme changes and interactions.

.build-check/assets/vendor-micromark-factory-space-BM4zcA-B.js

@@ -0,0 +1 @@
+import{f as a}from"./vendor-micromark-util-character-Cn8n62xE.js";function p(n,t,i,u){const f=u?u-1:Number.POSITIVE_INFINITY;let m=0;return o;function o(r){return a(r)?(n.enter(i),e(r)):t(r)}function e(r){return a(r)&&m++<f?(n.consume(r),e):(n.exit(i),t(r))}}export{p as f};