Setup dev environment

[SharonStrats]

Setup dev environment so I can test when changing styles.

[Copilot]

Pull request overview

Adds a local webpack-based development harness for the folder-pane package, enabling running the pane standalone in a browser with CSS support and Solid login UI.

Changes:

• Introduces webpack dev server config + shared module rules (JS/TS via Babel, CSS + CSS modules, .ttl as source assets).
• Adds a dev/ standalone app (HTML/JS/context stub) and a global CSS file for local styling overrides.
• Adds npm start and required webpack-related dev dependencies.

Reviewed changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
webpack.module.rules.mjs	Defines loader rules for JS/TS, CSS (incl. CSS modules), and .ttl assets.
webpack.dev.config.mjs	Adds a development webpack config using HtmlWebpackPlugin + Node polyfills and module rules.
package.json	Adds start script and webpack-related devDependencies.
dev/index.js	Implements the dev entrypoint rendering folderPane and wiring a minimal outliner adapter + login status UI.
dev/index.html	Provides the dev page template used by HtmlWebpackPlugin.
dev/dev-global.css	Adds dev-only global styling overrides and accessibility-focused base styles.
dev/context.js	Provides a minimal context object and fetcher for the dev harness.

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[timea-solid]

Looks great.