Improve macOS shortcuts and sound controls for v0.3.3

[andy5090]

What changed

• moved the centered paper/page-width toggle to F5 so it works reliably in macOS terminals
• retained Alt+P as an alternate shortcut where terminals preserve Alt input
• consolidated sound controls in the F10 panel and renamed the master toggle to Typing sound
• made footer shortcut guidance adapt to narrow terminal widths while preserving F5 and F10
• bumped Termleaf to v0.3.3

Why

macOS terminal input does not reliably deliver Alt+P, which made paper mode inaccessible. The previous footer also truncated important controls in smaller windows, and sound toggling was split across F5 and F10.

Validation

• cargo fmt --all -- --check
• cargo test --all-features (81 tests)
• cargo clippy --all-targets --all-features -- -D warnings
• cargo build --release
• git diff --check

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Add a width-safe final shortcut fallback

When the terminal is narrower than 19 cells in English or 18 in Korean, no candidate fits and this fallback returns choices[4] even though it is wider than cols. The caller consequently clips it; for example, at 10 columns the footer becomes F5 Page F, hiding the intended F10 shortcut even though a compact F5 F10 hint would fit. Add shorter fallbacks or otherwise ensure the selected guide fits the supplied width.

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