2D floor-map: kawasan view (All + per-factory focus & dim)

[digtaalfathir]

Bring the 2D floor-map to parity with the 3D kawasan (All + per-factory focus/dim). 2D is SVG, so simpler than 3D (opacity on <g>, viewBox for zoom — no material/async issues).

Tasks

• Merge per-factory 2D layouts into one kawasan layout: offset each factory's coords, tag rooms/walls/pins with factory (+ optional floor), add a factories manifest with per-factory viewBox bounds
• floormap.js: factory selector (All + each factory)
• All = viewBox = whole kawasan; Focus = viewBox = factory bounds + dim other factory <g> groups
• Reuse the same ?factory= deep-link as 3D (stays on the same factory when toggling 3D↔2D)
• Multi-floor in 2D = floor selector swaps the plan (2D is flat; no stacking)

Acceptance: pick Factory N → 2D zooms to it + others dimmed; back to All → everything visible. Depends on the "Builder 2D: tag factory" issue.