feat(maps): refreshed floor plans, expo-hall segment, and location pins

[JacobCoffee]

Summary

• Replaces the four LBCEC floor plans with the marked-up 2026 versions (Concourse, Upper, Arena & Exhibit Halls, Seaside).
• Re-points the Expo Hall menu entry at the conference map page with the Expo Hall segment pre-selected (toolbar title becomes "Expo Hall"). Removes the now-unused `ExpoHallPageModule`.
• Introduces a reusable `LocationMapComponent` + shared `FloorPlanModalModule`. Each location card shows a floor-plan thumbnail with a pulsing PyCon-pink pin and opens a zoomable full floor plan on tap.
• Help & Safety: Info Desk row is now an inline mini-map pinned to the INFO oval on the Concourse Level.
• Venues & Hours: parses the markdown content into sections and drops a mini-map under each known section heading (Registration, Info Desk, Swag Pickup, Quiet Room, Lost & Found at Staff Office). Splitter accepts H1/H2/H3 so it survives CMS heading-level tweaks.

Pin coords live in `src/app/location-map/venue-locations.ts` so they're easy to tune.

Test plan

• Tap Expo Hall in the side menu → conference map opens on the Expo Hall segment, title reads "Expo Hall".
• Tap Conference Map in the side menu → opens on the Floor Plans segment, title reads "Conference Center".
• On Help & Safety, the Info Desk mini-map shows the Concourse Level with the pin on the INFO oval; tapping opens the full floor plan with the same pin.
• On Venues & Hours, each section heading (Registration, Information Desk, Swag Pickup, Attendee Quiet Room, Lost & Found) shows a mini-map below it with the pin landing on the correct floor element. Lost & Found points to Staff Office on the Upper Level.
• Tap any mini-map → modal opens, image is pinch-zoomable, pulsing pin visible.
• Floor plan image swap renders correctly on each card in Conference Map → Floor Plans.

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