Add light appearance and enhanced status displays

[shenfy]

Summary

• add configurable light and dark appearances across the watchface
• show a normalized current weather condition above the graph, while keeping forecast location as a configuration option
• show a numeric battery percentage beside the compact battery icon on Pebble Time 2 (Emery); smaller displays retain the compact icon only
• add deterministic light-theme fixture coverage and document the new options

Testing

• mise build
• mise build release
• both profiles build successfully for Aplite, Basalt, Diorite, Emery, and Flint
• visually checked light mode on Aplite, Basalt, and Emery
• visually checked condition and location status modes on Emery
• verified condition mappings and fixture JSON
• git diff --check

[mattrossman]

Do you have any screenshots of the new look?

[shenfy]