Terminal mentions and context

[maskdotdev]

What Changed

Added terminal context mentions to the composer, wired in terminal read snapshots, and fixed stale mention insertion plus carriage-return rendering in terminal tail output.

Why

closes #1042

UI Changes

Composer can now include terminal context mentions, and terminal output/mentions render more cleanly in the chat flow.

t3code-terminal-mentions.mov

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

Note

Add terminal mention support in the chat composer to capture terminal tail snapshots

• Adds a terminal.read API (contracts, WebSocket server, native API) that returns a rendered tail snapshot of terminal history, stripping ANSI sequences and handling carriage-return overwrites.
• Extends the composer @ mention menu to list available terminals alongside files; selecting a terminal fetches the tail snapshot and inserts an inline terminal context pill into the draft.
• Concurrent user edits are preserved during async snapshot resolution via deferred placeholder insertion in ChatView.tsx.
• Terminal items are visually distinguished in ComposerCommandMenu.tsx with a term badge and updated empty-state copy.

^{Macroscope summarized d9876bd.}

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