convert to vite, typescript add some tests

[SharonStrats]

Migrate to vite.

There weren't really any tests so I just added a few so that I could setup the vite with the testing.

Also converted the other files that were still js to ts.

[Copilot]

Pull request overview

Migrates the project’s build/dev/test toolchain from Webpack/Jest/Babel to Vite/Vitest, while completing the TypeScript conversion and adding a small Vitest-based unit test suite to validate core chat-creation behavior.

Changes:

• Replace Webpack/Babel/Jest setup with Vite/Vitest configuration and scripts.
• Convert remaining JS usage patterns to TypeScript-friendly code (notably in chat pane implementations).
• Add initial Vitest unit tests for create.ts and longChatPane.mintNew.

Reviewed changes

Copilot reviewed 17 out of 19 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
webpack.dev.config.mjs	Removed legacy Webpack dev configuration as part of the Vite migration.
vite.config.mts	Added Vite/Vitest configuration (build entry + jsdom test environment).
tsconfig.json	Adjusted TS module resolution for bundler/Vite usage and simplified typeRoots.
test/unit/longChatPane.test.ts	Removed placeholder Jest test.
test/longChatPane.test.ts	Added Vitest coverage for longChatPane.mintNew (graph + ACL writes).
test/jest.setup.ts	Removed Jest-specific setup.
test/helpers/setup.ts	Added Vitest global test setup (mock cleanup).
test/create.test.ts	Added Vitest coverage for getChat behavior (existing vs create/invite flows).
src/shortChatPane.ts	Strengthened typing and error handling around message store detection.
src/longChatPane.ts	Added TS types and refactors for side panels/options/thread handling.
src/index.ts	Added default export for local dev environment usage.
src/create.ts	Added return type assertion for mintNew result.
package.json	Updated entrypoints/exports and switched scripts to Vite/Vitest toolchain.
jest.config.mjs	Removed Jest configuration.
dev/index.js	Removed legacy dev harness entrypoint (Webpack-era).
dev/index.html	Removed legacy dev HTML (Webpack-era).
dev/context.ts	Removed legacy dev context wiring (Webpack-era).
babel.config.mjs	Removed Babel configuration (no longer used with Vite build).

Comments suppressed due to low confidence (2)

src/longChatPane.ts:333

• HTMLElement.style is a CSSStyleDeclaration and isn’t meant to be assigned a CSS string. Assigning a string to area.style can throw at runtime (modules are strict mode) and/or silently do nothing; use area.style.cssText = ... or setAttribute('style', ...) instead.
  src/longChatPane.ts:366
• If the user isn’t logged in, this handler returns after participantsArea has already been initialized, so subsequent clicks won’t rebuild the panel even after login (it will just toggle an empty panel). Also, the alert message contains typos. Check me before creating/assigning participantsArea, and set the initial styles via cssText rather than assigning to .style.

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