refactor(web/api): errCode + errMessage helpers; 41 sites migrated (W1)

web/src/lib/components/AddToPlaylistMenu.svelte

@@ -3,7 +3,7 @@
   import { useQueryClient } from '@tanstack/svelte-query';
   import { createPlaylistsQuery, appendTracks, createPlaylist } from '$lib/api/playlists';
   import { qk } from '$lib/api/queries';
-  import { copyForCode } from '$lib/api/error-copy';
+  import { errMessage } from '$lib/api/errors';
   import TrackMenuItem from './TrackMenuItem.svelte';
   import TrackMenuDivider from './TrackMenuDivider.svelte';
   import type { TrackRef } from '$lib/api/types';
@@ -37,8 +37,7 @@
       await queryClient.invalidateQueries({ queryKey: qk.playlists() });
       onClose();
     } catch (e: unknown) {
-      const code = (e as { code?: string })?.code ?? 'unknown';
-      error = copyForCode(code);
+      error = errMessage(e);
     } finally {
       busy = false;
     }
@@ -57,8 +56,7 @@
       await queryClient.invalidateQueries({ queryKey: qk.playlists() });
       onClose();
     } catch (e: unknown) {
-      const code = (e as { code?: string })?.code ?? 'unknown';
-      error = copyForCode(code);
+      error = errMessage(e);
     } finally {
       busy = false;
     }

web/src/lib/components/FlagPopover.svelte

@@ -3,6 +3,7 @@
   import { Flag } from 'lucide-svelte';
   import { useQueryClient } from '@tanstack/svelte-query';
   import { flagTrack } from '$lib/api/quarantine';
+  import { errCode } from '$lib/api/errors';
   import { qk } from '$lib/api/queries';
   import type { TrackRef, LidarrQuarantineReason } from '$lib/api/types';
 
@@ -34,7 +35,8 @@
       await client.invalidateQueries({ queryKey: qk.myQuarantine() });
       onClose();
     } catch (e) {
-      error = (e as { code?: string }).code ?? 'flag_failed';
+      const code = errCode(e);
+      error = code === 'unknown' ? 'flag_failed' : code;
     } finally {
       submitting = false;
     }

web/src/lib/components/PlaylistCard.svelte

@@ -4,6 +4,7 @@
   import type { Playlist, PlaylistTrack, TrackRef } from '$lib/api/types';
   import { user } from '$lib/auth/store.svelte';
   import { getPlaylist, refreshDiscover, refreshForYou } from '$lib/api/playlists';
+  import { errCode } from '$lib/api/errors';
   import { qk } from '$lib/api/queries';
   import { playQueue } from '$lib/player/store.svelte';
 
@@ -95,7 +96,7 @@
       await queryClient.invalidateQueries({ queryKey: qk.playlist(playlist.id) });
       await queryClient.invalidateQueries({ queryKey: qk.playlists() });
     } catch (err: unknown) {
-      showToast(`Refresh failed: ${(err as { code?: string })?.code ?? 'unknown'}`);
+      showToast(`Refresh failed: ${errCode(err)}`);
     }
   }
 </script>

web/src/lib/components/RemoveTrackPopover.svelte

@@ -2,7 +2,7 @@
   import { Trash2 } from 'lucide-svelte';
   import { useQueryClient } from '@tanstack/svelte-query';
   import { removeTrack } from '$lib/api/admin/tracks';
-  import { copyForCode } from '$lib/api/error-copy';
+  import { errMessage } from '$lib/api/errors';
   import { qk } from '$lib/api/queries';
   import type { TrackRef } from '$lib/api/types';
 
@@ -45,8 +45,7 @@
       // surface (if any) can pick up the flag.
       onClose();
     } catch (e: unknown) {
-      const code = (e as { code?: string })?.code ?? 'unknown';
-      error = copyForCode(code);
+      error = errMessage(e);
     } finally {
       busy = false;
     }