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-remark-math--xuta7zy.js

@@ -0,0 +1 @@
+import{m as i}from"./vendor-micromark-extension-math-05RmQtyV.js";import{m as e,a as k}from"./vendor-mdast-util-math-wB-IJCL0.js";const c={};function E(s){const t=this,n=s||c,o=t.data(),r=o.micromarkExtensions||(o.micromarkExtensions=[]),a=o.fromMarkdownExtensions||(o.fromMarkdownExtensions=[]),m=o.toMarkdownExtensions||(o.toMarkdownExtensions=[]);r.push(i(n)),a.push(e()),m.push(k(n))}export{E as r};