feat(poweruser): command/shortcut registries, Buzzbee tokens, palette 2.0

- Command registry with 27 commands across 5 categories
- Shortcut registry with 18 shortcuts + remapping support
- useShortcutManager hook with collision detection
- Command history store (last 20 commands)
- Command palette 2.0: fuzzy search, >/#/@ prefixes, NLP preview
- Interactive shortcut remapping in Settings
- Buzzbee design token migration (light + dark)
- Compact density with real CSS tokens
- Motion duration variables

apps/web/tailwind.config.ts

@@ -53,7 +53,7 @@ export default {
         },
       },
       borderRadius: {
-        lg: "var(--radius)",
+        lg: "10px",
         md: "calc(var(--radius) - 2px)",
         sm: "calc(var(--radius) - 4px)",
       },