LED-panel polish and sensor fixes.
- Translatable LED panel labels. The memory (LC1), disk (LF11) and clock (LC2) panels and the metric-selection buttons drew their labels from baked artwork (some Chinese, some missing). They're now i18n overlays, so changing the app language changes the panel. The clock's first-day-of-week also fixes an upstream typo (Sunday/Monday, not "Tuesday").
- Segment temperature in your unit. The 7-segment display lit the °F label but printed the raw °C number (26 °C shown as "26°F"); it now converts to the selected °C/°F.
- Brightness previews. The brightness slider only dimmed the device; the on-screen preview now dims too.
- Rotation-interval control restored. Metric-page styles (AX120/AK120/LC1/LF8/LF12/CZ1/LF11/LF15) regain the "Circulate" cycle-speed field; "select all" styles (PA120/LF10) correctly don't show it.
- SSD/disk temperature on Linux (nvme/drivetemp) and Windows (LibreHardwareMonitor); HDD metrics on by default; System-Info disk-temp row fixed.
- Upright preview on rotated non-square panels (wire output unchanged).
- Window raises on relaunch without hanging (#196).
Full notes: doc/CHANGELOG.md