fix(keybind): handle sticky leader modifiers

[d-init-d]

What

• Improve keybind decoding for terminals that send Ctrl+letter as ASCII control codes.
• Make leader-chord matching resilient when users keep holding the leader modifier ("sticky" Ctrl/Meta/etc).

Why

Some terminals emit Ctrl combinations as control bytes (e.g. \x07), and users often keep Ctrl held after pressing a leader chord (e.g. ctrl+x then g). This combination can cause the second key to be missed even though the chord intent is clear.

How

• Normalize ASCII control codes in Keybind.fromParsedKey() (1..26 => ctrl+a..z, 0x1F => ctrl+_), while intentionally skipping ambiguous codes (tab/enter/backspace/etc).
• When a leader is active, attempt exact match first; if that fails, retry after stripping the captured leader modifiers from the incoming key event.

Tests

• cd packages/opencode && bun test test/keybind.test.ts
• cd packages/opencode && bun run typecheck

Fixes #10444

[github-actions]

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No duplicate PRs found