Feature/workspace seatmap 1117

[mijinummi]

Description

This PR addresses Issue #1117 [GF-FE-22], delivering an interactive vector SVG floor plan matrix on workspace specification profiles linked directly to date-bound backend availability trackers.

Key Modifications

• Vector Canvas Seating Overlay: Engineered FloorPlanView.tsx utilizing interactive SVG scaling shapes to paint absolute $x/y$ seat nodes cleanly on top of underlying uploaded imagery overlays.
• Color Identity States: Implemented reactive hex coloring mapping out structural definitions (Green $\rightarrow$ Available, Red $\rightarrow$ Occupied, Blue $\rightarrow$ Actively Selected).
• Isomorphic Date Telemetry Sync: Tied date selection state boundaries inside [id]/page.tsx to automatically re-trigger data synchronization pipelines descending from GET /workspaces/:id/seat-map?date=....
• Zero-Layout Fallback Shielding: Provided structured placeholder layers rendering descriptive callouts smoothly whenever workspace objects exhibit blank layout attributes.

Target Branch: main
Closes #1117
Closes #1118
Closes #1119
Closes #1123

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