Refactor Styles into separate CSS

[SharonStrats]

For ticket SolidOS/solidos#238

• Create CSS files and import them
• Build from one file

Retested importing into solid-panes from local meeting-pane.

[Copilot]

Pull request overview

Refactors Meeting Pane styling out of inline JS styles into standalone CSS, and updates the webpack build to process CSS and produce both normal and minified library bundles.

Changes:

• Added shared moduleRules (JS/TS, CSS, CSS modules, TTL) and wired them into both dev and prod webpack configs.
• Moved various inline styles in src/index.js into src/styles/meetingPane.css and imported the CSS from the entrypoint.
• Updated packaging/build output to write to lib/ and added new typings files (index.d.ts, declarations.d.ts).

Reviewed changes

Copilot reviewed 8 out of 11 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
webpack.module.rules.mjs	New shared webpack loader rules including CSS handling.
webpack.dev.config.mjs	Switched dev build to use shared rules (but currently missing an import).
webpack.config.mjs	Refactored production build into common + normal/min configs; added copying of styles and terser minification.
src/styles/meetingPane.css	New stylesheet replacing several previously inline styles.
src/index.js	Imports CSS and replaces inline styles with class-based styling.
package.json	Changes published entrypoints and published files, and adds CSS/tooling deps.
package-lock.json	Locks new build dependencies (css-loader, style-loader, copy-webpack-plugin, terser-webpack-plugin, etc.).
index.d.ts	New type entry file re-exporting declarations.
declarations.d.ts	Adds PaneDefinition typing and default export declaration for the pane.
dev/index.js	Updates dev entry to import from src/index and loads a dev-global CSS file; changes demo URL.
dev/dev-global.css	Adds local-dev global CSS variables/resets used by the refactored CSS.

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