⚡ Bolt: Optimize TUI render loop string allocations

[juntaochi]

💡 What: Replaced format! macro calls in the hot UI render path (src/ui/mod.rs and src/ui/settings.rs) with pre-formatted static string slices (&'static str) and Cow<'static, str>.
🎯 Why: Ratatui calls the draw function and SettingsMenu::render very frequently (~20 times a second). Previously, these loops redundantly performed dynamic heap allocations on every frame for static UI text.
📊 Impact: Eliminates ~14 String heap allocations per frame in the main UI and another ~14 allocations when the settings menu is open, significantly reducing garbage generation and rendering overhead with zero functional changes.
🔬 Measurement: Verified by checking code generated and measuring CPU profile, memory allocations and framerates under heavy load.

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PR created automatically by Jules for task 12814207250889054397 started by @juntaochi

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