⚡ Bolt: [performance improvement] Optimize string truncation in TUI render loop

[omsingh02]

💡 What: Replaced the instantiation of rich.text.Text(text) and the subsequent check of len(rich_text.plain) with a direct len(text) check in the _safe_truncate method of src/ui/tui.py.

🎯 Why: The _safe_truncate method is called repeatedly for every cell in the TUI songs table during each render cycle. Instantiating a full Rich Text object solely to get the length of the string introduces significant unnecessary overhead. Since rich_text.plain on a plain string without styling simply returns the original string, len(rich_text.plain) is identical to len(text). Bypassing this object creation removes a noticeable performance bottleneck in the high-frequency render loop.

📊 Impact: Reduces object creation and garbage collection pressure significantly during UI updates. Speeds up rendering, especially when there are many songs in the list, making the TUI snappier and more responsive.

🔬 Measurement: Verify by running the application with python -m src.main and scrolling through the songs list; rendering should be smoother. Tests pass.

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PR created automatically by Jules for task 2319020938481075717 started by @omsingh02

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