Add read-only trip summary widget

[raykellyjr]

Adds a read-only home screen Trip summary widget backed entirely by cached Room summaries. It never sends vehicle commands or polls the car.

Highlights:

• Vehicle selection with reconfigurable 7/30/90-day ranges
• Distance, drives, driving days, energy, efficiency, charging cost, and cost per 100 distance units
• Same-length previous-period distance comparison
• Honest charging-cost coverage labels for missing, partial, and complete price data
• Periodic/offline updates plus refresh after successful data sync
• Trips deep-linking without live car polling
• Cached TeslaMate unit and currency handling
• Localized widget copy in English, Catalan, German, Spanish, Italian, and Chinese
• Formatter and date-range unit coverage

Local verification:

• git diff --check
• ./gradlew :app:testDebugUnitTest :app:lintDebug :app:assembleDebug

Local setup note: Android SDK, Gradle cache, and build output are backed by an APFS sparsebundle on the external SSD to avoid internal disk pressure.