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>

apps/web/src/app/settings/settings-reset-section.component.html

@@ -20,7 +20,7 @@
             </div>
             <button
                 mat-button
-                class="danger-zone__button"
+                class="danger-zone__button app-destructive-button"
                 [class.danger-zone__button--busy]="isRemovingAllPlaylists()"
                 [disabled]="!canRemoveAllPlaylists()"
                 [attr.aria-busy]="isRemovingAllPlaylists()"
@@ -29,7 +29,6 @@
                     $event.stopPropagation();
                     removeAll.emit()
                 "
-                color="warn"
             >
                 @if (isRemovingAllPlaylists()) {
                     <mat-progress-spinner
@@ -49,9 +48,9 @@
         </div>
         <div class="danger-zone__summary" aria-live="polite">
             <span class="danger-zone__summary-pill">
-                <mat-icon class="danger-zone__summary-icon"
-                    >folder_open</mat-icon
-                >
+                <mat-icon class="danger-zone__summary-icon">{{
+                    sourceIcons.m3u
+                }}</mat-icon>
                 <span class="danger-zone__summary-label">{{
                     'HOME.PLAYLIST_TYPES.M3U' | translate
                 }}</span>
@@ -60,7 +59,9 @@
                 }}</span>
             </span>
             <span class="danger-zone__summary-pill">
-                <mat-icon class="danger-zone__summary-icon">cloud</mat-icon>
+                <mat-icon class="danger-zone__summary-icon">{{
+                    sourceIcons.xtream
+                }}</mat-icon>
                 <span class="danger-zone__summary-label">{{
                     'HOME.PLAYLIST_TYPES.XTREAM' | translate
                 }}</span>
@@ -69,7 +70,9 @@
                 }}</span>
             </span>
             <span class="danger-zone__summary-pill">
-                <mat-icon class="danger-zone__summary-icon">cast</mat-icon>
+                <mat-icon class="danger-zone__summary-icon">{{
+                    sourceIcons.stalker
+                }}</mat-icon>
                 <span class="danger-zone__summary-label">{{
                     'HOME.PLAYLIST_TYPES.STALKER' | translate
                 }}</span>