feat(KB-072): expand dashboard theme system with Factory tokens

- Add the Factory theme to shared theme types and the dashboard theme selector
- Validate persisted color themes against shared constants in useTheme and the pre-hydration init script
- Introduce reusable design tokens for typography, spacing, radius, shadows, and transitions in dashboard styles
- Add Factory-specific dark and light styling overrides for cards, buttons, columns, and theme swatches
- Strengthen theme tests to cover all supported themes, Factory previews, and stylesheet token contracts

.changeset/add-comprehensive-theme-system.md

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+---
+"@dustinbyrne/kb": minor
+---
+
+Add comprehensive design theme system with Factory theme
+
+- Expanded theme system to support design tokens beyond colors:
+  - Typography (font families)
+  - Spacing scale
+  - Border radius scale
+  - Component-specific styling
+  - Shadow and animation tokens
+- Added new "Factory" design theme with industrial sci-fi aesthetic:
+  - Monospace fonts for terminal feel
+  - Sharp corners and compact spacing
+  - Amber/cyan/green status indicators
+  - Industrial button styling
+- All existing color themes remain compatible