Add influence rework, image checkup, debug mode, and fetched paintings.

Support artist and movement influence links with web discovery, a developer checkup table with gallery/detail thumbnails, and debug image search with fix-it workflow.

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

Documentation/basics.md

@@ -9,7 +9,7 @@ The app is organised as a **drill-down hierarchy**:
 1. **Timeline** — historical eras (Ancient → Contemporary) with definite or fuzzy date boundaries.
 2. **Movement flow** — art movements as curved SVG streams on the same year axis; documented predecessor→successor branches; portrait thumbnails placed along each stream.
 3. **3D gallery** — one personal hall per artist; paintings on the walls, open centre, single exit for influence-based navigation.
-4. **Painting detail** — full work in the centre, *Influenced By* on the left, *Influenced* on the right, prev/next catalog browsing, optional fullscreen, link to artist biography.
+4. **Painting detail** — full work in the centre, *Influenced By* on the left, *Influenced* on the right (paintings, artists, or movements), prev/next catalog browsing, optional fullscreen, link to artist biography.
 5. **Artist biography** — portrait, lifespan, movement, and Wikipedia-sourced intro text (`bio_short` / `bio_full`).
 
 All artwork images are stored locally under `data/images/` — the UI never hot-links to Wikipedia or Commons at runtime (except optional on-demand fetch when a file is missing).
@@ -149,7 +149,7 @@ Each artist appears as a **portrait circle** on their movement’s stream row:
 
 Artist portraits stop wheel/drag propagation so zooming over a face does not fight portrait clicks.
 
-**Note:** Movement lineage is **frontend curation** for layout and labels — it is not stored in PostgreSQL. Painting-to-painting influence edges (`painting_influences`) are separate and drive the 3D exit picker and detail panels.
+**Note:** Movement lineage is **frontend curation** for layout and labels — it is not stored in PostgreSQL. Painting influence links (`painting_influence_sources`, plus legacy `painting_influences` for hall navigation) are separate and drive the 3D exit picker and detail panels.
 
 ## Virtual gallery (3D halls)
 
@@ -191,7 +191,7 @@ Opened from the 3D hall (click a frame) or from influence thumbnails on another
 
 | Layer | What you see |
 |-------|----------------|
-| **Detail** | Centre image, *Influenced By* (left) and *Influenced* (right), position in catalog (e.g. `3 of 12`) |
+| **Detail** | Centre image, *Influenced By* (left) and *Influenced* (right) — painting thumbnails, artist portraits, or movement swatches — position in catalog (e.g. `3 of 12`) |
 | **Fullscreen** | Click the centre image; `Escape` or click anywhere to return to detail only |
 
 **Controls:**
@@ -202,6 +202,7 @@ Opened from the 3D hall (click a frame) or from influence thumbnails on another
 | `←` / `→` | Same as prev / next (disabled while fullscreen is open) |
 | Click centre image | Open fullscreen lightbox |
 | Click influence thumbnail | Open that work’s detail (different artist allowed) |
+| Click influence artist portrait | Open that artist’s 3D gallery hall |
 | **← Back to Gallery** | Return to the hall you entered from — **3D camera position is preserved** |
 | **About {artist}** | Open artist biography |
 
@@ -217,9 +218,9 @@ Opened from the 3D hall (click a frame) or from influence thumbnails on another
 - **Movement filtering** on zoom only shows movements that have at least one artist active in the visible year range.
 - **Movement lineage** (`movement-lineage.ts`) documents art-historical predecessor→successor links for the flow diagram; extend that file to add or correct branches.
 - **One hall per artist** keeps navigation predictable: enter from the timeline or bio, leave via the single exit or back button.
-- **Influence-based hall links** connect artists through documented painting-to-painting relationships, grouped by movement at the exit.
+- **Influence-based hall links** connect artists through documented painting relationships, grouped by movement at the exit.
 - **3D gallery images** use locally cached files only; slow remote fetches would break realtime rendering.
-- **Influence data** is stored as directed edges between paintings, with optional citation fields (source author, quote, URL) for art-historical references.
+- **Influence data** is stored as directed links from paintings to sources (another painting, an artist, or a movement), with optional period fields and citation metadata (source author, quote, URL).
 
 ## Related docs