phase 3 of 4: a devframe shell as good as Vue and Nuxt DevTools #312

Goal

Vue DevTools v9 and Nuxt DevTools v4 now run as docks inside Vite DevTools, which is built on devframe, our own base. They get a command palette, messages, terminals, settings and a plugin API from it. We use only docks.register, rpc, sharedState and agent, so most of this phase is wiring up what devframe already ships. Rough size: 4 to 6 weeks. Follows #310 and #311.

Shell

• Command palette (Cmd/Ctrl+K) through ctx.commands, with a command for every tab and action (pick, record change detection, clear, dock mode). Use a local palette when there is no hub. Add a global popup shortcut, configurable through popup.hotkey.
• Settings page: theme toggle, hide, pin and reorder tabs, and a passive mode where the popup stays hidden until the shortcut.
• A splitter for the docked popup, and pop-out into its own window.
• Deep links to an item, not just a tab (#tab=&id=&page=), plus an open-in-panel agent tool.
• One timeline with toggleable layers for router, HTTP, NgRx, change detection, forms and signals, instead of five separate timelines.
• Errors inspector: wrap ErrorHandler, error and unhandledrejection, parse NG0xxx codes with a doc link, and link the owning component. Replace the three console patches with one console tap. Add list-errors, explain-error and list-console agent tools.
• A terminals dock (ctx.terminals) for ng build and ng test output.

Setup and distribution

• An ng add schematic that patches main.ts and server.ts, plus a dev-server builder that mounts the hub middleware. This removes the CLI, proxy and one-time-code steps from the client-only setup.
• Publish the extension to the Chrome Web Store and Edge Add-ons, and ship a Firefox build.
• Docs: a one-path quick start, screenshots on every inspector page, and an "Angular DevTools vs Pangular Inspector" FAQ entry.

Performance and scale

• Push deltas instead of full snapshots for the component tree, injectors, change detection and forms. Use MutationObserver dirty flags, throttle to about once a second, and add an activity lease so idle pages stop pushing.
• Virtualize long lists and trees (2,000-row tables), starting with content-visibility.

Done when

• The shell rows in the comparison match Nuxt DevTools v4.
• First-run setup is one command.