Align influence lamps 40cm above the tallest hall frame.

Compute the highest allocated frame top per hall and place every influence lamp on that shared rail so markers line up across different canvas sizes.

Co-authored-by: Cursor <cursoragent@cursor.com>

Documentation/basics.md

@@ -301,7 +301,7 @@ Each artist has **exactly one hall**. The hall is a rectangular room sized to fi
 | Floor | Herringbone **parquet** procedural texture (`parquetFloorTexture.ts`) |
 | Wall tint | Gallery walls blend the artist’s **movement colour** into cream plaster tones |
 | Frame finish | **Unchecked** works: black moulding; **Reviewed** (`checkup_checked`): bright gold moulding at **double width** |
-| Influence lamps | A golden picture light appears **above frames** whose work has any influence-graph edge (`has_influence_links` from the API); fixture is mounted **upside down** and is **emissive-only** (no per-frame lights — see light budget below) |
+| Influence lamps | A golden picture light marks works with any influence-graph edge (`has_influence_links` from the API). All lamps in a hall share one rail height: **40 cm above the tallest allocated frame** in that hall (so they line up regardless of canvas size). Fixture is mounted **upside down** and is **emissive-only** (no per-frame lights — see light budget below) |
 | Curator-note plates | A small brass plate hangs **beneath frames** that have non-empty `curator_notes` |
 | Eye-level viewing | Frame centres sit at **eye height (~1.65 m)**; the camera stays **level with the floor** (no pitch up/down) |
 | Open centre | Floor and ceiling only — no freestanding columns or pedestals in the walkway |