feat: F029 intelligence card system — premium AI-native CRE cards

Gold/Silver/Bronze FIFA-style score badges overlaid on location imagery.
List/grid view toggle on Results and Properties pages (persisted in
localStorage). IntelligenceMatchCard for match results grid view;
PropertyIntelligenceCard for property grid view with warm brown theme.
LocationPreview component with Google Maps link. 10 mock properties
enriched with Unsplash building images.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/components/shared/index.ts

@@ -0,0 +1,4 @@
+export { ViewToggle } from './ViewToggle'
+export { LocationPreview } from './LocationPreview'
+export { getScoreTier, SCORE_THEME } from './scoreTheme'
+export type { ScoreTier } from './scoreTheme'