feat(workspaces): archive option + archived-workspaces view

Consume the backend's archive contract (feature/archive-workspaces):

- adapter/http: archive(id)/unarchive(id) (PUT/DELETE /workspaces/:id/archive);
  list(archived?) passes the ?archived= query
- logic/view-model: pure applyArchived(list, id, archived)
- store.svelte: setArchived(id, archived) (optimistic + revert-on-error +
  reconciling refresh); archivedList + refreshArchived() for the archived view
- ui/TileActionBar: new Archive action (the right-click→select action bar)
- ui/HomeHeader: new Archived button opens the archived view
- ui/ArchivedWorkspaces (new): modal listing archived workspaces with
  Unarchive + View (navigates to /<id>)
- ui/WorkspacesHome: wire the Archive action + the Archived modal
- .dispatch/wire.reference.md + backend-handoff.md: record the contract delta

1 files changed, 1 insertions, 0 deletions

diff --git a/src/features/workspaces/ui/HomeHeader.test.ts b/src/features/workspaces/ui/HomeHeader.test.ts
index b4ef6c4..40b060f 100644
--- a/src/features/workspaces/ui/HomeHeader.test.ts
+++ b/src/features/workspaces/ui/HomeHeader.test.ts
@@ -8,6 +8,7 @@ function props() {
     onCreate: vi.fn(async (_slug: string): Promise<{ ok: true }> => ({ ok: true })),
     onOpenPlugins: vi.fn(),
     onSort: vi.fn(),
+    onOpenArchived: vi.fn(),
   };
 }