Vamooses Dye Studio

**Added**
- Live-mode keybindings for Apply and Revert (suggested by ReganB) -- assign
  keys in Options > Keybindings, under a "Vamoose's Dye Studio" section. Each
  presses the matching button, so it only fires when that button is active
  (Apply needs pending, owned changes; Revert needs pending changes). The Apply
  and Revert tooltips show your bound key, or a reminder to set one.

**Changed**
- The live-mode Apply button is now green so it stands out as the primary
  action next to Revert and Snapshot.
- The Colors harmony detail view is tidier: each strategy (Neutral, Mono,
  Analogous, ...) is now a contained card with its label as a header, laid over
  the selected dye's own two-tone gradient wash.
- The Canvas Harmonise menu now describes each strategy on hover -- its effect
  plus the same proportion "area guide" bar as the Colors detail tooltip, so the
  full guidance is where you actually trial harmonies.