Add PainterPalette integration, canonical DB schema, and influence UI fixes.

Integrate Inputs/PainterPalette.csv for artist metadata and influence links, add db/schema.sql with server/migrate.js, letterbox influence panel thumbnails, and refresh Titian/Pontormo images.

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

scripts/export-paintings-csv.js

@@ -0,0 +1,36 @@
+require('dotenv').config();
+const fs = require('fs');
+const path = require('path');
+const pool = require('../server/db');
+
+function csvEscape(value) {
+  const v = value == null ? '' : String(value);
+  if (/[",\n\r]/.test(v)) return `"${v.replace(/"/g, '""')}"`;
+  return v;
+}
+
+async function main() {
+  const { rows } = await pool.query(`
+    SELECT a.name AS artist, p.title AS painting, p.year
+    FROM paintings p
+    JOIN artists a ON a.id = p.artist_id
+    ORDER BY a.name, p.year NULLS LAST, p.title
+  `);
+
+  const outDir = path.join(__dirname, '..', 'Output');
+  fs.mkdirSync(outDir, { recursive: true });
+
+  const header = 'artist,painting,year';
+  const lines = rows.map((r) =>
+    [csvEscape(r.artist), csvEscape(r.painting), csvEscape(r.year ?? '')].join(',')
+  );
+  const file = path.join(outDir, 'paintings.csv');
+  fs.writeFileSync(file, `${[header, ...lines].join('\n')}\n`, 'utf8');
+  console.log(`Wrote ${rows.length} rows to ${file}`);
+  await pool.end();
+}
+
+main().catch((err) => {
+  console.error(err);
+  process.exit(1);
+});