feat(discover): snooze affordance on Android + web suggestion cards — #2375

Completes the snooze from slice 3 (#2374), so it's now touchable on both
clients (rule #27 — the server side alone was never shippable).

Copy is "Not right now" everywhere, never a dislike (rule #101). The
parked list even says so out loud: "Nothing here counts against your
taste profile."

Both clients flip the card in place to a "Not right now" state with an
Undo, rather than yanking it out of the grid under the cursor. The row
leaves on the next refetch; the persistent way back is a parked-list
section below the deck. That list isn't optional garnish — a snoozed
candidate is by definition absent from the deck, so without it the
DELETE endpoint is unreachable.

Android routes the write through the offline MutationQueue per rule #100,
as ONE toggle kind (SUGGESTION_SNOOZE_TOGGLE) carrying the desired state
rather than two action kinds. That reuses the LIKE_TOGGLE collapse: a
queued snooze the user has since undone is dropped unsent instead of
replaying after the undo and re-hiding an artist they asked to see. The
collapse helper is now a pure top-level function so that rule is unit
tested rather than inferred.

The repository does NOT enqueue on a 4xx — a permanent rejection would
replay to the same failure and would raise a misleading "will sync when
online" hint. The common case is a 404 from un-snoozing a row that
already lapsed, which is the user's intended end state anyway.

Also: an empty deck used to have one meaning (no listening signal yet).
It can now also mean "you parked them all", so the empty copy branches —
telling that user to go listen to something would be wrong advice.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

web/src/lib/api/queries.ts

@@ -58,6 +58,7 @@ export const qk = {
   smtpConfig:             ()              => ['smtpConfig'] as const,
   suggestions:            (limit?: number) =>
     ['suggestions', { limit: limit ?? 12 }] as const,
+  suggestionSnoozes:      ()              => ['suggestionSnoozes'] as const,
   home:         ()                 => ['home'] as const,
   albumsAlpha:  ()                 => ['albumsAlpha'] as const,
   artistTracks: (artistId: string) => ['artistTracks', artistId] as const,

web/src/lib/api/suggestions.test.ts

@@ -1,13 +1,18 @@
 import { afterEach, describe, expect, test, vi } from 'vitest';
 
 vi.mock('./client', () => ({
-  api: { get: vi.fn() }
+  api: { get: vi.fn(), post: vi.fn(), del: vi.fn() }
 }));
 
-import { listSuggestions } from './suggestions';
+import {
+  listSuggestions,
+  listSnoozes,
+  snoozeSuggestion,
+  unsnoozeSuggestion
+} from './suggestions';
 import { qk } from './queries';
 import { api } from './client';
-import type { ArtistSuggestion } from './types';
+import type { ArtistSuggestion, SuggestionSnooze } from './types';
 
 afterEach(() => vi.clearAllMocks());
 
@@ -40,3 +45,56 @@ describe('suggestions client', () => {
     expect(qk.suggestions(20)).toEqual(['suggestions', { limit: 20 }]);
   });
 });
+
+describe('suggestion snoozes (#2375)', () => {
+  test('snoozeSuggestion sends the name — the server 400s without it', async () => {
+    (api.post as ReturnType<typeof vi.fn>).mockResolvedValueOnce(null);
+    await snoozeSuggestion('mb-1', 'Parked Artist');
+    expect(api.post).toHaveBeenCalledWith('/api/discover/suggestions/mb-1/snooze', {
+      name: 'Parked Artist'
+    });
+  });
+
+  test('snoozeSuggestion sends no days, leaving the default to the server', async () => {
+    (api.post as ReturnType<typeof vi.fn>).mockResolvedValueOnce(null);
+    await snoozeSuggestion('mb-1', 'Parked Artist');
+    const body = (api.post as ReturnType<typeof vi.fn>).mock.calls[0][1] as Record<string, unknown>;
+    expect(body).not.toHaveProperty('days');
+  });
+
+  // MBIDs are UUIDs today, but the column is free-text and the value comes
+  // from an external similarity feed, so it goes through encodeURIComponent.
+  test('the mbid is URL-encoded into the path', async () => {
+    (api.post as ReturnType<typeof vi.fn>).mockResolvedValueOnce(null);
+    await snoozeSuggestion('weird/id?x', 'Odd');
+    expect(api.post).toHaveBeenCalledWith(
+      '/api/discover/suggestions/weird%2Fid%3Fx/snooze',
+      { name: 'Odd' }
+    );
+  });
+
+  test('unsnoozeSuggestion DELETEs the same path', async () => {
+    (api.del as ReturnType<typeof vi.fn>).mockResolvedValueOnce(null);
+    await unsnoozeSuggestion('mb-1');
+    expect(api.del).toHaveBeenCalledWith('/api/discover/suggestions/mb-1/snooze');
+  });
+
+  test('listSnoozes hits the snoozes collection', async () => {
+    const fixture: SuggestionSnooze[] = [
+      {
+        mbid: 'mb-1',
+        name: 'Parked Artist',
+        snoozed_until: '2026-11-01T00:00:00Z',
+        created_at: '2026-08-03T00:00:00Z'
+      }
+    ];
+    (api.get as ReturnType<typeof vi.fn>).mockResolvedValueOnce(fixture);
+    const got = await listSnoozes();
+    expect(api.get).toHaveBeenCalledWith('/api/discover/snoozes');
+    expect(got).toEqual(fixture);
+  });
+
+  test('qk.suggestionSnoozes key shape', () => {
+    expect(qk.suggestionSnoozes()).toEqual(['suggestionSnoozes']);
+  });
+});

web/src/lib/api/suggestions.ts

@@ -1,7 +1,7 @@
 import { createQuery } from '@tanstack/svelte-query';
 import { api } from './client';
 import { qk } from './queries';
-import type { ArtistSuggestion } from './types';
+import type { ArtistSuggestion, SuggestionSnooze } from './types';
 
 export async function listSuggestions(limit = 12): Promise<ArtistSuggestion[]> {
   return api.get<ArtistSuggestion[]>(`/api/discover/suggestions?limit=${limit}`);
@@ -14,3 +14,36 @@ export function createSuggestionsQuery(limit = 12) {
     staleTime: 5 * 60_000   // 5 minutes — see M5c spec §5
   });
 }
+
+// Parks a suggestion for the server's default period (90 days). `name` is
+// REQUIRED by the server and is not optional bookkeeping: candidates are
+// out-of-library, so there is no artists row to resolve a display name from
+// and the snooze list would have nothing to render. Omitting it is a 400.
+//
+// No `days` is sent. There is deliberately no duration UI yet — that knob is
+// slice 6 (#2377) — and hardcoding a value here would pin the default to the
+// client instead of the server that owns it.
+export async function snoozeSuggestion(mbid: string, name: string): Promise<void> {
+  await api.post<null>(`/api/discover/suggestions/${encodeURIComponent(mbid)}/snooze`, { name });
+}
+
+// Brings a parked suggestion back immediately. The server 404s an MBID that
+// was never snoozed; callers treat that as already-unsnoozed rather than as a
+// failure, since the end state the user asked for is the one they get.
+export async function unsnoozeSuggestion(mbid: string): Promise<void> {
+  await api.del(`/api/discover/suggestions/${encodeURIComponent(mbid)}/snooze`);
+}
+
+export async function listSnoozes(): Promise<SuggestionSnooze[]> {
+  return api.get<SuggestionSnooze[]>('/api/discover/snoozes');
+}
+
+export function createSnoozesQuery() {
+  return createQuery({
+    queryKey: qk.suggestionSnoozes(),
+    queryFn: listSnoozes
+    // No staleTime, unlike the suggestions query: this list is the only route
+    // back to an un-snooze, so it must reflect a snooze made seconds ago
+    // rather than a cached view of the world.
+  });
+}

web/src/lib/api/types.ts

@@ -334,6 +334,16 @@ export type ArtistSuggestion = {
   image_url?: string; // resolved on-demand from Lidarr; absent → card placeholder
 };
 
+// One parked suggestion — "not right now", not a dislike. The server only
+// ever returns rows whose snoozed_until is still in the future, so the client
+// never has to compare against the clock to decide what to show.
+export type SuggestionSnooze = {
+  mbid: string;
+  name: string;
+  snoozed_until: string; // RFC3339
+  created_at: string;
+};
+
 // Mirrors internal/api/types.go HomePayload. All slices are non-null
 // per the server contract — empty sections render as [].
 export type HomePayload = {