[Rush] Add rush-serve plugin dashboard UI and config updates

[mojaza]

Summary

This PR adds a built-in dashboard for the Rush serve plugin so developers can monitor and control watch-mode execution from a browser without creating a separate client.

The change introduces dashboard frontend assets, serves them through the plugin, and documents how to configure and open the dashboard route.

Details

Added a dashboard UI with:

• WebSocket connection and reconnect handling
• Overall status and iteration state visibility
• Table and graph views
• Filtering, search, and selection workflows
• Run controls: run once, pause/resume, abort
• Terminal/log output panel

Other changes:

• Added global routing config to serve dashboard assets from a workspace-level path.
• Added build copy steps so dashboard static assets are emitted with package outputs.
• Added lint configuration for browser globals used by dashboard code.
• Updated plugin documentation with setup and usage instructions.

Design notes

Considered keeping the dashboard as an external sample app.

Chose an in-package dashboard to make onboarding easier and reduce setup friction.

Compatibility and performance

Backward compatibility is preserved; changes are additive.

Existing plugin configuration continues to work.

Runtime impact is expected to be minimal and mostly limited to static asset serving during watch-mode usage.

How it was tested

TBD

Impacted documentation

• Plugin README was updated with dashboard configuration and usage guidance.
• No website documentation updates identified.

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[bmiddha]

remove ts-nocheck, we need this file to be checked.

[mojaza]

Ah, I removed it on a different codespace which hasn't been staged. I just removed it and made the file types safe in this file.

[bmiddha]

split off the dashboard.ts into smaller scoped modules.
try to componentise the web app. for example, the top bar can live in a separate file and have it's own scoped CSS module

[bmiddha]

try to keep the state and mutation logic separate from rendering