Fix Recenter bleed-through; drop noisy speed events; track detail as bottom sheet

Recenter button was reappearing over overlays because the isFollowing
flow kept calling fadeIn(fabRecenter) even when an overlay was visible.
Added overlayShowing flag — the flow skips FAB updates while an overlay
is shown. hideOverlays() now correctly restores fabRecenter visibility
based on the actual following state instead of just resetting alpha.

Speed up/Slow down events fired on every 1.5 kt GPS jitter, flooding
the log with noise. Removed the detection loop entirely — no reliable
motor on/off signal is available from GPS alone.

TrackDetailSheet converted from a full-screen Fragment to a
BottomSheetDialogFragment: opens at half-screen height so the track
route is visible on the map behind it, draggable to full height, 20%
background dim. SavedTracksFragment now calls hideOverlays() then
sheet.show() instead of fragment-replacing the overlay container.

https://claude.ai/code/session_01YUbuZNDAoLea4cf9UGQ9qn

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