Document Gariff influence workbook and pack timeline lanes by time span.

Add Inputs/gariff_influential_painters_influences.xlsx for curator import, document Inputs/Output conventions, and let non-overlapping movements share horizontal lanes on the timeline.

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

Documentation/basics.md

@@ -76,8 +76,8 @@ Gallery/
 │   ├── painter-palette-lib.js
 │   ├── import-painter-palette.js
 │   └── image-fetcher.js
-├── Inputs/              # External datasets (e.g. PainterPalette.csv)
-├── Output/              # Generated exports (e.g. paintings.csv)
+├── Inputs/              # External datasets & influence workbooks (PainterPalette, book extracts, …)
+├── Output/              # Generated exports (CSV dumps, scratch extracts) — gitignored
 ├── data/images/         # Local portraits and paintings (+ thumbs/)
 ├── db/                  # schema.sql, setup-admin.sql, migrate-*.sql
 ├── server/migrate.js    # npm run dev:migrate — schema + incremental migrations
@@ -246,7 +246,7 @@ Each visible movement is drawn as a **portrait-width curved stream** (~54 px str
 | Feature | Implementation |
 |---------|----------------|
 | Lineage layout | `client/src/data/movement-lineage.ts` — curated predecessor→successor pairs (Met / ArtStory / museum essays); multiple parents allowed |
-| Vertical depth | Successor movements sit on rows below their deepest parent; sibling movements at the same depth are spread into lanes to limit overlap |
+| Vertical lanes | Movements whose time spans do **not** overlap (in the current zoom) share a horizontal lane; only concurrent spans stack into extra rows (`assignTemporalLanes` in `MovementBands.tsx`). Lineage depth still drives branch curves, not exclusive vertical bands |
 | Branch connectors | Smooth curves from the **centre** of a parent stream to the **centre** of each child stream (siblings fan out along the parent’s length) |
 | Visual blending | Path-aligned SVG gradients with transparent fades at stream ends and branch junctions; streams draw on top of branches so overlap brightness stays uniform |
 | Filtering | A movement is drawn when its **span overlaps** the visible year range **and** it has at least one catalogued artist — artists whose lifespan falls outside the window still keep their movement visible (their portraits simply do not render). Filtered client-side after initial load |