fix: recognize kitty CSI-u codepoints for F1 through F12

[ashokDevs]

Summary

kitty_codepoint_to_keycode mapped codepoints for F13-F35 (57376-57398) but had no entries for F1-F12 (57364-57375), so those silently fell through to None. Terminals that send function keys as full kitty CSI-u sequences (e.g. Ghostty, which enables the kitty keyboard protocol by default) had F1-F12 dropped entirely.

Reproduction

Confirmed live against a running herdr session: built the binary, started an isolated dev session with previous_tab/next_tab bound to F3/F4, and injected the raw byte sequences a kitty-protocol terminal sends for those keys (\x1b[57366u for F3, \x1b[57367u for F4) directly into the pane. Before the fix, both did nothing. After the fix, both correctly switched tabs.

I could not reproduce the exact asymmetry in #1809 (reporter says F2/F4 worked but F3 didn't) - in my testing the gap affects F1-F12 uniformly. This fix addresses the confirmed underlying gap either way.

Tests

• just lint
• just ci (3066 tests, 0 failures)
• Added kitty_f1_through_f12_codepoints_are_recognized, replacing unknown_kitty_functional_key_remains_unsupported which had codified the gap as expected behavior

refs #1809

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: ae8fa1e0-6619-4f34-ab5f-68934001622d

📥 Commits

Reviewing files that changed from the base of the PR and between eb93ec8 and b5a7a34.

📒 Files selected for processing (1)

• src/input/parse.rs

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📝 Walkthrough

Walkthrough

The input parser now decodes Kitty functional key codepoints 57364..=57375 as F1–F12. Tests also verify recognition of F13, and the dedicated rejection path for Kitty functional codepoints was removed.

Changes

Kitty functional key parsing

Layer / File(s)	Summary
Function key mapping and validation src/input/parse.rs	The parser maps Kitty codepoints 57364..=57375 to F1–F12, removes the dedicated rejection branch, and tests F1–F13 recognition.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the main change: recognizing Kitty CSI-u codepoints for F1 through F12.
Description check	✅ Passed	The description explains the missing mappings, user impact, implementation, reproduction, tests, and issue reference.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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