⚡ Bolt: Optimize time formatting in PlayerSlider

[LeanBitLab]

💡 What: Replaced String.format with Kotlin string interpolation in formatTime of PlayerSlider.
🎯 Why: String.format is notoriously slow in Android, and this format method is called very frequently during video playback updates (e.g., every 100ms in PlayerSlider). The interpolation string avoids instantiating a Formatter on every update, reducing CPU cycles and garbage collection pressure.
📊 Impact: Decreases allocation and speeds up formatting logic during time slider updates.
🔬 Measurement: Profile the application during video playback and observe reduced time spent and garbage collection in string formatting routines for the PlayerSlider.

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PR created automatically by Jules for task 8989576798891655874 started by @LeanBitLab

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