fix(tui): reset quit confirmation on esc

[OnlyYu1996]

Summary

• clear the pending Ctrl+C quit confirmation whenever Esc is handled
• make Ctrl+C and Esc quit confirmations cancel each other instead of sharing stale timers
• add regression tests for both Ctrl+C -> Esc -> Ctrl+C and Esc -> Ctrl+C -> Esc sequences

Bounty issue: PlatformNetwork/bounty-challenge#53113

Validation

ustfmt +stable --edition 2024 --check src/cortex-tui/src/app/methods.rs src/cortex-tui/src/runner/event_loop/input.rs

• cargo +stable test --package cortex-tui app::methods::tests -- --nocapture
• cargo +stable check --package cortex-tui --lib
• git diff --check

Note: cargo +stable fmt --package cortex-tui --check is currently blocked by an unrelated existing formatting diff in src/cortex-tui/src/question.rs; the touched files pass rustfmt directly.

[greptile-apps]

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