Add Stadium Progress system and themed loading spinners

Stadium Progress & Achievements:
- Add StadiumVisit and Achievement SwiftData models
- Create Progress tab with interactive map view
- Implement photo-based visit import with GPS/date matching
- Add achievement badges (count-based, regional, journey)
- Create shareable progress cards for social media
- Add canonical data infrastructure (stadium identities, team aliases)
- Implement score resolution from free APIs (MLB, NBA, NHL stats)

UI Improvements:
- Add ThemedSpinner and ThemedSpinnerCompact components
- Replace all ProgressView() with themed spinners throughout app
- Fix sport selection state not persisting when navigating away

Bug Fixes:
- Fix Coast to Coast trips showing only 1 city (validation issue)
- Fix stadium progress showing 0/0 (filtering issue)
- Remove "Stadium Quest" title from progress view

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

SportsTimeTests/ScenarioAPlannerSwiftTests.swift

@@ -21,7 +21,8 @@ struct ScenarioAPlannerSwiftTests {
         id: UUID = UUID(),
         city: String,
         latitude: Double,
-        longitude: Double
+        longitude: Double,
+        sport: Sport = .mlb
     ) -> Stadium {
         Stadium(
             id: id,
@@ -30,7 +31,8 @@ struct ScenarioAPlannerSwiftTests {
             state: "ST",
             latitude: latitude,
             longitude: longitude,
-            capacity: 40000
+            capacity: 40000,
+            sport: sport
         )
     }