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>

client/src/pages/HomePage.css

@@ -32,6 +32,45 @@
   text-align: center;
   padding: 24px 16px 8px;
   flex-shrink: 0;
+  position: relative;
+}
+
+.site-dev-tools {
+  position: absolute;
+  top: 16px;
+  right: 16px;
+  display: flex;
+  gap: 8px;
+  align-items: center;
+}
+
+.debug-mode-toggle,
+.checkup-link-btn {
+  padding: 6px 12px;
+  border-radius: 6px;
+  border: 1px solid rgba(201, 169, 110, 0.35);
+  background: rgba(15, 15, 26, 0.85);
+  color: rgba(201, 169, 110, 0.75);
+  font-size: 12px;
+  font-family: ui-monospace, 'Cascadia Code', monospace;
+  cursor: pointer;
+  transition: background 0.2s, border-color 0.2s, color 0.2s;
+}
+
+.debug-mode-toggle:hover,
+.checkup-link-btn:hover {
+  border-color: #c9a96e;
+  color: #e8d5b5;
+}
+
+.debug-mode-toggle-active {
+  border-color: #e8a040;
+  background: rgba(232, 160, 64, 0.15);
+  color: #e8a040;
+}
+
+.checkup-link-btn {
+  text-decoration: none;
 }
 
 .site-header h1 {