feat: add edit button to collection detail page header (#113)

* feat: add edit button to collection detail page header

Wire up the existing EditCollectionModal to the collection detail page
with a pencil icon button in the header actions bar. Owner-only,
responsive (icon-only on mobile), refreshes page data after saves.

Closes IDEA-494

* fix: navigate to new slug after collection rename in edit modal

When a collection is renamed, the backend regenerates the slug. The
onupdated callback now receives the updated Collection object, so the
collection page can detect a slug change and navigate to the new URL
instead of 404ing on the old slug.

Addresses PR review feedback from #113.

* fix: refresh collectionStore after edit modal update

Ensures the sidebar reflects updated collection name/slug/icon
immediately after editing, matching the settings page behavior.

Addresses P2 review feedback from #113.

web/src/lib/components/collections/EditCollectionModal.svelte

@@ -10,7 +10,7 @@
 		open: boolean;
 		collection: Collection;
 		wsSlug: string;
-		onupdated: () => void;
+		onupdated: (updated?: Collection) => void;
 		onclose: () => void;
 	}
 
@@ -336,9 +336,9 @@
 				data.migrations = migrations;
 			}
 
-			await api.collections.update(wsSlug, collection.slug, data);
+			const updated = await api.collections.update(wsSlug, collection.slug, data);
 			toastStore.show(`Updated ${name.trim()}`, 'success');
-			onupdated();
+			onupdated(updated);
 		} catch (err) {
 			error = err instanceof Error ? err.message : 'Failed to update collection';
 		} finally {

web/src/routes/[username]/[workspace]/[collection]/+page.svelte

@@ -14,7 +14,9 @@
 	import { syncService } from '$lib/services/sync.svelte';
 	import { toastStore } from '$lib/stores/toast.svelte';
 	import ShareDialog from '$lib/components/ShareDialog.svelte';
+	import EditCollectionModal from '$lib/components/collections/EditCollectionModal.svelte';
 	import { authStore } from '$lib/stores/auth.svelte';
+	import { collectionStore } from '$lib/stores/collections.svelte';
 
 	type ViewMode = 'list' | 'board' | 'table';
 
@@ -38,6 +40,7 @@
 	let saveViewInput = $state<HTMLInputElement>();
 
 	let shareDialogOpen = $state(false);
+	let editCollectionOpen = $state(false);
 	let workspaceMembers = $state<{ user_id: string; role: string }[]>([]);
 
 	let wsSlug = $derived(page.params.workspace ?? '');
@@ -803,6 +806,17 @@
 						<QuickActionsMenu actions={quickActions} {collection} scope="collection" />
 					{/if}
 
+					{#if isOwner}
+						<button
+							class="edit-collection-btn"
+							onclick={() => { editCollectionOpen = true; }}
+							title="Edit collection"
+						>
+							<svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M11 4H4a2 2 0 0 0-2 2v14a2 2 0 0 0 2 2h14a2 2 0 0 0 2-2v-7"/><path d="M18.5 2.5a2.121 2.121 0 0 1 3 3L12 15l-4 1 1-4 9.5-9.5z"/></svg>
+							<span class="edit-collection-label">Edit</span>
+						</button>
+					{/if}
+
 					{#if isOwner}
 						<button
 							class="share-btn-header"
@@ -966,6 +980,23 @@
 	/>
 {/if}
 
+{#if isOwner && collection}
+	<EditCollectionModal
+		bind:open={editCollectionOpen}
+		{collection}
+		{wsSlug}
+		onupdated={(updated) => {
+			collectionStore.loadCollections(wsSlug);
+			if (updated && updated.slug !== collSlug) {
+				goto(`/${username}/${wsSlug}/${updated.slug}`);
+			} else {
+				loadCollection(wsSlug, collSlug, showArchived);
+			}
+		}}
+		onclose={() => { editCollectionOpen = false; }}
+	/>
+{/if}
+
 <style>
 	.collection-page {
 		max-width: var(--content-max-width);
@@ -1374,6 +1405,10 @@
 		.share-btn-label {
 			display: none;
 		}
+
+		.edit-collection-label {
+			display: none;
+		}
 	}
 
 	/* Share button */
@@ -1400,4 +1435,25 @@
 	.share-icon {
 		flex-shrink: 0;
 	}
+
+	/* Edit collection button */
+	.edit-collection-btn {
+		display: flex;
+		align-items: center;
+		gap: var(--space-1);
+		background: var(--bg-secondary);
+		border: 1px solid var(--border);
+		border-radius: var(--radius);
+		padding: var(--space-1) var(--space-3);
+		cursor: pointer;
+		font-size: 0.82em;
+		color: var(--text-secondary);
+		white-space: nowrap;
+		transition: border-color 0.15s, color 0.15s;
+	}
+
+	.edit-collection-btn:hover {
+		color: var(--text-primary);
+		border-color: var(--text-muted);
+	}
 </style>