Migrate to Vite

[NoelDeMartin]

This PR is blocked by:

• Testing helpers + sandbox improvements toolkit#4

[Copilot]

Pull request overview

Migrates the project’s build/dev/test toolchain from Webpack + Jest to Vite + Vitest, aligning the repo with solidos-toolkit’s Vite integration and introducing a Vite-based pane development sandbox.

Changes:

• Remove Webpack/Babel/Jest configuration and legacy dev sandbox assets.
• Add Vite/Vitest configuration (including coverage + setup file) and update unit tests/snapshots accordingly.
• Update package entrypoints/exports and npm scripts to use Vite for build/dev/watch.

Reviewed changes

Copilot reviewed 25 out of 26 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-server configuration.
webpack.config.mjs	Removed legacy Webpack production bundling configuration.
vite.config.mts	Added Vite + Vitest configuration and dev-sandbox aliases/plugins.
tsconfig.test.json	Updated test TS config to include Node types.
tsconfig.dev.json	Removed legacy dev TS config used by Webpack/ts-loader.
test/unit/trustedApplications/trustedApplications.test.ts	Migrated test imports from Jest env to Vitest.
test/unit/trustedApplications/snapshots/trustedApplications.test.ts.snap	Updated snapshot header/keys for Vitest.
test/unit/social/triage.test.ts	Migrated Jest mocking (jest.fn) to Vitest (vi.fn).
test/unit/outline/propertyViews.test.ts	Migrated test imports from Jest env to Vitest.
test/unit/outline/manager.test.ts	Migrated test imports from Jest env to Vitest.
test/setup.ts	Added Vitest setup (jest-dom integration + fetch mocking + globals).
test/helpers/setup.ts	Removed Jest-specific setup.
test/helpers/globals.js	Removed Jest global shims previously needed for UMD/global expectations.
src/outline/manager.js	Switched a global assignment from global to globalThis.
src/dev.ts	Added a Vite dev-sandbox pane entry that initializes the main page.
README.md	Updated development instructions for the Vite dev server/port.
package.json	Switched scripts to Vite/Vitest and updated package entrypoints/exports.
jest.config.mjs	Removed Jest configuration.
dev/pane/index.ts	Removed legacy dev pane loader.
dev/loader.ts	Removed legacy Webpack-based dev loader.
dev/index.html	Removed legacy dev HTML shell for Webpack dev-server.
dev/dev-mash.css	Removed legacy dev-only mash CSS bundle.
dev/dev-mash-utilities.css	Removed legacy dev-only utility CSS bundle.
dev/dev-light.css	Removed legacy dev-only light theme CSS bundle.
babel.config.mjs	Removed Babel configuration previously used for builds/tests.

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[timea-solid]

@NoelDeMartin take a look at copilot feedback.

[NoelDeMartin]

@NoelDeMartin take a look at copilot feedback.

I already did, and replied/resolved the issues it raised :).