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feat: scratchpad for precipitation and UV trend improvements - #170

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mattrossman wants to merge 10 commits into
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feat/precip-bar-chart-with-uv
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feat: scratchpad for precipitation and UV trend improvements#170
mattrossman wants to merge 10 commits into
mainfrom
feat/precip-bar-chart-with-uv

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Scratchpad — not intended to merge as-is

This draft is built on top of #167 and is intended as a working branch for iterating on two related areas:

This is deliberately a combined scratchpad PR, not the final merge shape.

Follow-up plan

  1. Backport the precipitation bar graph improvements onto feat: precipitation amount bar chart #167, or create a new draft PR from that work.
  2. Split the UV exposure trend into a separate PR containing only the UV-related changes.

Validation

  • mise build

mattrossman added a commit that referenced this pull request Aug 27, 2026
Adds absolute precipitation amount bars to the weather graph, default
enabled.

Amount is rendered from absolute 0-10 categories, mapped from the
inches-per-hour values from providers. OpenWeatherMap only supports mm/h
so we convert before mapping. Bars are green on color screens w/ tinted
outline, or black with white outline on monochrome screens.

| basalt | emery | flint |
|--------|--------|--------|
| <img width="144" height="168" alt="2026-08-11T00-27-10-basalt"
src="https://github.com/user-attachments/assets/76abfe32-e886-4513-9cac-58851631a361"
/> | <img width="200" height="228" alt="2026-08-11T00-27-58-emery"
src="https://github.com/user-attachments/assets/7f601834-3ff7-4435-bc26-cbe4c13c8ec4"
/> | <img width="144" height="168" alt="2026-08-26T22-50-53-flint"
src="https://github.com/user-attachments/assets/9780352a-4432-40a9-903a-b01c38a18df5"
/> |


Supporting changes:
- Updates Pebble SDK/tool pins to latest.
- Fixes night shading rendering in precipitation regions on B&W watches
- Adds % to the "Free heap" report on `build-preview`

Includes improvements backported from
#170
@mattrossman mattrossman mentioned this pull request Aug 27, 2026
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