fix(ui): destructive confirmations, verb labels and provider icons

Confirmations: ConfirmDialogData.confirmLabel is required, so no dialog can
fall back to "Yes"/"No"; the dismiss defaults to "Cancel" and
`tone: 'destructive'` styles the confirm with .app-destructive-button. Every
caller names its action ("Remove playlist", "Clear", "Refresh playlist",
"Cancel download" with a "Close" dismiss). The confirm button has the
confirm-dialog-confirm test id and drops its no-op color="primary".

The no-op `warn` color input becomes .app-destructive-button on the EPG
mapping, playlist item, error view, EPG/reset settings, delete-all and source
cleanup buttons, and on the unsaved-changes dialog's Discard.

Provider icons come from SOURCE_TYPE_ICONS in shared/interfaces (Xtream
cloud, Stalker cast, M3U playlist_play / link / description / subject) in the
add dialog, auto-import, empty state, playlist switcher, playlist rows,
dashboard source rail, command palette, Sources filters and both reset
summaries. Stalker no longer borrows the Dashboard icon, and Xtream no longer
shares a glyph with M3U URL playlists.

The playlist error view removed a playlist through the stale
PlaylistActions.removePlaylist: it dropped the playlist from state before the
delete ran, swallowed failures, skipped the source activity guard and showed
no toast. It now uses PlaylistDeleteActionService like every other removal,
commits only a completed delete, toasts and goes home. The unused action and
its effect are removed.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

libs/workspace/dashboard/feature/src/lib/rails/workspace-dashboard-rails.component.ts

@@ -9,6 +9,7 @@ import {
 import { toSignal } from '@angular/core/rxjs-interop';
 import { startWith } from 'rxjs';
 import {
+    getPlaylistSourceIcon,
     isStalkerAccountPlaylist,
     isXtreamAccountPlaylist,
     normalizeDashboardRailsSettings,
@@ -286,11 +287,7 @@ export class WorkspaceDashboardRailsComponent {
                 playlist.filename ||
                 this.t('WORKSPACE.DASHBOARD.UNTITLED_SOURCE'),
             subtitle: this.data.getPlaylistProvider(playlist),
-            icon: playlist.serverUrl
-                ? 'cloud'
-                : playlist.macAddress
-                  ? 'cast'
-                  : 'folder_open',
+            icon: getPlaylistSourceIcon(playlist),
             link: this.data.getPlaylistLink(playlist),
             actions: buildDashboardSourceActions(
                 playlist,
@@ -675,6 +672,8 @@ export class WorkspaceDashboardRailsComponent {
             message: this.translate.instant(
                 'HOME.PLAYLISTS.REMOVE_DIALOG.MESSAGE'
             ),
+            confirmLabel: this.translate.instant('HOME.PLAYLISTS.REMOVE'),
+            tone: 'destructive',
             onConfirm: () => {
                 void this.removePlaylist(playlist);
             },