fix(tui): patch @opentui/core to prevent mouse garbling on exit and fragmented input

[agutmanstein-scale]

Issue for this PR

Closes #20458

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

Patches @opentui/core@0.1.95 to fix two separate bugs that cause SGR mouse escape sequences to appear as garbled text in the terminal:

1. Post-exit mouse garbling (new fix)

When the renderer is destroyed, cleanupBeforeDestroy() calls stdin.setRawMode(false) (re-enabling terminal ECHO) before mouse tracking is disabled. Any mouse events arriving during this window get echoed as raw escape sequence bytes like 35;89;19M35;84;20M35....

The correct ordering already exists in suspend(). This patch applies the same pattern to cleanupBeforeDestroy():

1. disableMouse() — mouse off while raw mode is still on (no ECHO)
2. Drain buffered mouse events from stdin
3. setRawMode(false) — raw mode off last

Upstream fix: anomalyco/opentui#905

2. In-session mouse garbling (ported from #19520)

When SGR mouse escape sequences arrive fragmented across multiple stdin chunks (due to event loop pressure from LLM streaming + TUI rendering), the StdinParser's timeout fires mid-sequence and leaks individual bytes as KEY events. Three timeout paths are patched:

• esc_recovery timeout: changed to emitOpaqueResponse + recovery flag
• csi timeout: added recovery flag for subsequent < routing
• esc_less_mouse timeout: changed to deferred wait instead of flush

Also bumps DEFAULT_TIMEOUT_MS from 20 to 25ms for defense-in-depth.

How did you verify your code works?

• bun packages/opencode/test/cli/tui/test-stdin-parser.mjs — StdinParser fragmentation tests (9/9 pass)
• bun packages/opencode/test/cli/tui/test-destroy-mouse-cleanup.mjs — structural tests verifying correct ordering in the patched code (5/5 pass)
• packages/opencode/test/cli/tui/frag-pty.py — PTY wrapper for manual end-to-end testing

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

🤖 Generated with Claude Code

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Related PR found:

• PR fix(tui): patch StdinParser to prevent garbled text from fragmented mouse sequences #19520: "fix(tui): patch StdinParser to prevent garbled text from fragmented mouse sequences"
  • fix(tui): patch StdinParser to prevent garbled text from fragmented mouse sequences #19520
  • Relationship: PR fix(tui): patch @opentui/core to prevent mouse garbling on exit and fragmented input #20462 explicitly ports the in-session mouse garbling fix from this PR and builds upon it with an additional post-exit mouse garbling fix. The current PR is addressing issue bug: mouse escape sequences garbled after TUI exit #20458, which covers both the fragmented input issue (from fix(tui): patch StdinParser to prevent garbled text from fragmented mouse sequences #19520) and a new post-exit cleanup issue.

This is not a duplicate but rather an evolution/enhancement of previous work.

[rekram1-node]

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