fix: move aura into theme button row — 4th button next to dark/light/auto (#1129)
the aura was incorrectly placed as a separate section below appearance.
now it's a 4th button in the theme selector row where it belongs.
locked state: dashed border, dark circle, "?" label.
active state: solid border, weather orb, "aura" label.
selecting any other theme disables ambient mode.
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
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