v0.2.1 - Dashboard units and refreshed screenshots

The local weather dashboard now coordinates temperature, wind, gusts, and rain units from one selection.

Selection	Temperature	Wind and gusts	Cumulative rain
Fahrenheit	F	mph	inches
Celsius	C	km/h	mm

The browser remembers the selection. Stored readings and CSV field units remain unchanged. Rain is the cumulative sensor total, not daily rainfall.

This release also refreshes the README, repository description, feature summary, documentation links, and screenshot gallery. New images show actual live reception on November 3, 2026; earlier screenshots remain labeled as experiment history.

Dashboard guide and complete screenshot gallery

Validation: both display modes were checked in the running UI. All 37 software tests, native C++ fixture checks, and the firmware build passed in GitHub Actions. Documentation links and image loading were checked. This update does not change the RF acquisition or onboard decoder algorithm introduced in v0.2.0.

Reception remains experimental. Native 915 MHz reception, absolute RF frequency, and useful range remain unverified.