[bug] unmount errors are silently swallowed during cleanup

[ZainabTravadi]

Which package?

@termuijs/jsx

What happened?

Errors thrown during app.unmount() are silently swallowed during cleanup.

Currently the cleanup helper wraps app.unmount() in an empty catch block:

try {
    app.unmount();
} catch {}

As a result, cleanup failures are completely hidden from developers, making unmount-related issues difficult to diagnose.

Expected behavior:

• Cleanup should continue even if an individual unmount() call fails.
• The error should be logged so developers can understand why cleanup failed.

Actual behavior:

• Errors are silently ignored with no logging or diagnostics.

Steps to reproduce

const app = {
  unmount() {
    throw new Error('Unmount failed');
  }
};

// Trigger the cleanup path that invokes app.unmount()

Observe that the error is swallowed and no diagnostic output is produced.

Environment

• Bun version: 1.x
• OS: Linux (WSL)
• Terminal emulator: Windows Terminal
• TermUI version: Latest main branch

Screenshots or terminal output

Current behavior:

(no output)

Expected behavior:

[jsx] Error during unmount(): Error: Unmount failed

GSSoC contributor?

• Yes. I contribute under GSSoC 2026.
• No.

[github-actions]

✅ Auto-assigned to @ZainabTravadi (issue opener).

Open your PR by 2026-06-29 (7 days). The bot frees this issue for another contributor after that date.

Reminders:

• ⭐ Star the repo first. The star-check job blocks your merge otherwise.
• PR title: type: short description
• Link this issue in your PR body: Closes #1757

Good luck. 🚀