Wire 18 new standalone components into their pages #313

Commit 09d9036 added 16 new, working, typed components as a components-first pass — none of them are imported or rendered anywhere yet. Each is ready to drop into a real flow; this issue tracks actually doing that.

(Originally 18 - the two maintainer/ components were removed, admin tooling isn't something this project needs.)

map/

• place-detail-drawer.tsx (PlaceDetailDrawer) — a fuller detail view than the pin popup. Natural home: opened from a pin click or a results-list row, alongside/instead of the existing popup.
• compare-places-sheet.tsx (ComparePlacesSheet) — side-by-side compare of 2-3 places. Needs a selection UI (e.g. a "compare" checkbox on results-list rows) to collect the places to compare.
• filter-presets.tsx (FilterPresets) — quick filter-combo buttons. Natural home: map-panel.tsx, near the category chips.
• heatmap-toggle.tsx (HeatmapToggle) — control only, no heatmap rendering yet. Needs map-view.tsx wiring to actually visualize density before this is useful.
• directions-modal.tsx (DirectionsModal) — Google/Apple/geo: deep links. Natural home: pin popup or place-detail-drawer, as a "Directions" action.
• report-issue-dialog.tsx (ReportIssueDialog) — "report a problem with this place". Natural home: pin popup or place-detail-drawer.
• category-icon.tsx (CategoryIcon) — shared type-to-icon mapping. Could replace the duplicated colour-dot-only styling currently in category-chips.tsx, pin-popup.tsx, and results-list.tsx.

pins/

• place-review-badge.tsx (PlaceReviewBadge) — takes rating/reviewCount as explicit props (the Place schema has no such fields). No current caller passes them; needs a decision on whether/where rating data would ever live before this renders anything.
• exam-centre-countdown.tsx (ExamCentreCountdown) — valid_till expiry badge. Natural home: pin popup, next to VerifiedBadge, for sat_centre/foreign_lang_exam_centre places.

home/

• city-switcher.tsx (CitySwitcher) — natural home: navbar or homepage hero.
• city-stats-card.tsx (CityStatsCard) — natural home: /city/[slug] pages.
• recent-additions-feed.tsx (RecentAdditionsFeed) — presentation-only; the schema has no added-on date, so real recency ordering needs that field first (see note in the component's own doc comment).

sharing

• share-place-card.tsx (SharePlaceCard) — natural home: place-detail-drawer or pin popup.
• route-eta-card.tsx (RouteEtaCard) — straight-line distance/ETA from the user's home. Natural home: pin popup or place-detail-drawer, when home is set.

community

• contribution-leaderboard.tsx (ContributionLeaderboard) — natural home: /about, /contribute, or a new /community page.
• place-photo-gallery.tsx (PlacePhotoGallery) — scoped down to a Street View embed, not real photos (no photo field in the schema). Natural home: place-detail-drawer.