Property Photo Integration — Images, blueprints, floor plans

[GareBear99]

Overview

Integrate property photos, blueprints, and floor plans into listing cards and detail views.

Current State

• All source listings have images: [] — municipal assessment APIs don't provide photos
• Listing cards currently show GPS map tile thumbnails (which is a good fallback)
• The thumbnail system already has image-first priority: real photos → map tile → styled placeholder

Scope

• Research photo sources: Google Street View API, MLS photo feeds, satellite imagery
• Integrate property photo URLs into the source data schema
• Gallery view in listing detail modal (carousel or grid)
• Blueprint/floor plan display when available
• Image lazy loading and error fallback handling

Technical Notes

• listingThumbnailHtml() in gps-fallback-map.js already checks for images[0] first
• Need to ensure photo URLs are XSS-safe (already handled via _safeAttr())
• Consider thumbnail caching strategy for performance

Acceptance Criteria

• At least one photo source integrated for BC listings
• Photo carousel in detail modal
• Graceful fallback to map tiles when photos unavailable
• No increase in initial page load time