fix(tui): restore terminal state on crash and release leaked resources

[liruifengv]

Related Issue

No prior issue — this addresses resource leaks and terminal-state corruption found during an internal audit of the TUI.

Problem

The TUI had several resource-management gaps:

• After an uncaught exception, unhandled rejection, or a SIGTERM whose cleanup threw, the terminal was left in raw mode with a hidden cursor, bracketed paste still on, and XON/XOFF flow control disabled — the user's shell looked broken afterwards.
• stty -ixon was set on startup but never restored, so flow control stayed disabled in the user's shell after exit.
• Pasted image bytes were held for the whole session and never released when their transcript entries were trimmed, so memory grew in long, screenshot-heavy sessions.
• Several timers (feedback spinner, activity spinner, transcript components, footer, editor double-Esc) were not stopped during shutdown, leaking intervals on in-process restart.

What changed

• Add a best-effort terminal-restore helper and call it from the uncaughtException / unhandledRejection handlers and the emergency exit path.
• Wrap shutdown so the terminal is restored even when session or harness teardown throws.
• Save the original stty settings on startup and restore them on exit.
• Reclaim pasted image bytes once their owning transcript entries are trimmed.
• Stop feedback, activity, transcript, footer, and editor timers during shutdown; make reverse-RPC panel cleanup idempotent and event-loop re-entry safe.
• Add unit coverage for the new image-store removal API.

Checklist

• I have read the CONTRIBUTING document.
• I have linked a related issue, or explained the problem above.
• I have added tests that prove my feature works.
• Ran gen-changesets skill, or this PR needs no changeset.
• Ran gen-docs skill, or this PR needs no doc update.

[changeset-bot]

🦋 Changeset detected

Latest commit: 98b6978

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@moonshot-ai/kimi-code	Patch

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commit: 98b6978

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