Add component name formatters and grid-link navigation

Templates section:
- Define JS formatter functions per template (e.g. resistor, capacitor)
- First non-null result from any formatter is used as display name
- Live preview in template editor against first component
- Display names applied in component list, detail view, and inventory rows

Grid navigation:
- Grid-type inventory entries in component detail view show a '⊞' button
  to navigate directly to that grid's viewer

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lib/storage.mjs

@@ -125,6 +125,28 @@ export function delete_source_image(id) {
 	return store.delete(`s:${id}`);
 }
 
+// --- Component templates ---
+
+export function list_component_templates() {
+	const result = [];
+	for (const [key] of store.data.entries()) {
+		if (key.startsWith('ct:')) result.push(store.get(key));
+	}
+	return result.sort((a, b) => a.name.localeCompare(b.name));
+}
+
+export function get_component_template(id) {
+	return store.get(`ct:${id}`) ?? null;
+}
+
+export function set_component_template(tmpl) {
+	store.set(`ct:${tmpl.id}`, tmpl);
+}
+
+export function delete_component_template(id) {
+	return store.delete(`ct:${id}`);
+}
+
 // --- Grid images ---
 
 export function list_grid_images() {