Restyle past tracks: solid dark blue, dim/focus layers

All past tracks render as solid dark navy (#0B3050) at 45% opacity,
2.5px — no dashes. A second focus layer (#2B8FC4, full opacity, 4px)
paints on top when a track is selected, making it pop without changing
the dim layer's data. Active recording stays red.

The dim layer always contains every past track; the focus layer gets
the selected track's points independently via setFocusedTrackPoints().
Cleared on dismiss so all tracks return to equal dim opacity.

https://claude.ai/code/session_01YUbuZNDAoLea4cf9UGQ9qn

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