feat: polish all screens for round display (gabbro/chalk)

Add a content_rect() helper that computes a safe inset origin and width
for the current display shape:
- Round platforms (chalk 180px, gabbro 260px): inset = display_width/6
  (~30px on chalk, ~43px on gabbro) keeps all text within the circle.
- Rectangular platforms: inset = 0, no change in behavior.

Apply the inset to every window_load function:
- SimpleMenuLayer/MenuLayer windows (menu, presets, history): use
  inset bounds so items are never clipped by the circular frame.
- Menu windows use GColorWhite background on round so the area outside
  the inset menu rectangle blends seamlessly with the menu cells.
- All text-layer windows (timer, goal, edit-running, history-edit,
  stats, settings, detail): offset all GRect positions by (ox, oy) and
  use content width cw instead of bounds.size.w.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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