Refine Primary region cards

[kyleve]

Polishes the RegionSummaryCard styling on the Primary tab so it reads less generic and more like an intentional passport-stamp card.

Changes

• Progress bar — taller on the big Primary cards (progressBarHeight 6 → 10pt; compact Elsewhere cards keep 6 via a new progressBarHeightCompact), and a flat style.tint fill instead of the gradient.
• Day count — shrink the hero number (heroNumberFontSize 46 → 40) and enlarge the "days" unit (.subheadline → .title3 on Primary) so the number and unit read as a balanced pair rather than a huge number next to tiny text.
• Region name header
  • Larger: fixed 38pt serif. Measured against the layout budget (deviceWidth − 188), the common names ("California" ~183pt, "New York" ~173pt) fit fully even on the smallest iPhone; over-long names tighten then scale via minimumScaleFactor(0.7) rather than wrapping or overlapping the stamp.
  • Top-aligned header row so the title hugs the top instead of floating centered against the tall entry stamp (addresses the "too much top spacing" feel).
  • Tinted to match the day count (style.tint) at 0.8 opacity so it picks up a bit of the card behind it.
  • Natural casing instead of forced all-caps, with tightened tracking (-0.5), and kept to one line with allowsTightening.
• Emoji — removed from the card header (still used in the widgets, timeline, and toggle row), freeing horizontal room for the larger title.

Notes

• Pure presentational change in RegionSummaryCard + UIConstants; no logic, public API, or tests touched.
• The Primary header now uses a fixed point size (like the hero number already does), so it no longer grows with Dynamic Type — it does still shrink to fit. Called out in case we'd prefer .largeTitle (which keeps Dynamic Type but makes "California" render noticeably smaller than "New York" between the two stacked cards).
• Verified with ./swiftformat --lint (clean). This is UI-only; the iOS test schemes run in CI.