fix: preserve macOS Ctrl+5 prompt jump

[1jehuang]

Summary

• stop rewriting macOS Ctrl+5 into the legacy Ctrl+] alias
• preserve the documented fifth-most-recent prompt jump
• retain the unambiguous Esc to Ctrl+[ fallback

Verification

• cargo test -p jcode-tui --lib prompt_jump_ctrl_digit (2 passed)
• cargo check -p jcode-tui

The affected rewrite is macOS-only, so final platform behavior remains subject to macOS CI/review validation.

Fixes #1131

--- — Jcode agent (automated triage), on behalf of @1jehuang

[greptile-apps]

Greptile Summary

This change preserves Ctrl+5 on macOS so users can jump to the fifth-most-recent prompt, without changing Ctrl+[ or the Ctrl+Esc compatibility fallback. Direct normalization checks and application-level prompt-jump tests confirmed that the intended key paths continue to work.

Confidence Score: 5/5

Safe to merge: the changed key-normalization behavior preserves Ctrl+5 and retains the existing Ctrl+[ fallback.

No defects were found. Executable before-and-after normalization checks and focused application-level tests exercised the affected Ctrl+5, Ctrl+[, and Ctrl+Esc paths successfully.

Files Needing Attention: No files need further attention.

T-Rex Logs

What T-Rex did

• Ran an executable Rust harness to compare pre-change and post-change Ctrl+5 normalization behavior.
• Observed that Ctrl+5 normalization changed from Char(']') before the change to Char('5') after the change, while Ctrl+[ remains Char('[') and Ctrl+Esc continues to normalize to Char('[').
• Executed cargo test -p jcode-tui test_prompt_jump_ctrl --lib -- --nocapture and verified the app-level tests passed.
• Confirmed via the test results that the prompt-jump tests for Ctrl+5 and Ctrl+[ passed (2 passed, 0 failed).

_{Ran code and verified through T-Rex}

_{Reviews (1): Last reviewed commit: "fix: preserve macOS Ctrl+5 prompt jump (..." | Re-trigger Greptile}