v0.20.29

Changed

• Dark mode now uses a blue-tinted color palette (Option B): background #0F1117, surfaces #161A26/#1E2336, sidebar #0B0D14 — creates stronger visual hierarchy and complements the Indigo accent

Fixed

• Defined missing CSS tokens --color-surface-elevated and --color-surface-hover used by More-Sheet items, Search overlay inputs and results (previously transparent/invisible backgrounds)