Notify board members about moved cards according to their Deck setting

Replaces the yes/no notify_email flag with notify_mode:
- off:   no mail
- owner: only the board owner, as before (migrated from notify_email=1)
- board: everyone with access to the board, filtered by their own Deck
         "Notifications" setting for it (board:<id>:notify-due: off /
         assigned / all), mirroring Deck's NotificationHelper rules

Recipients are resolved via PermissionService::findUsers() (owner, ACL,
groups and circles expanded), AssignmentMapper::isUserAssigned() and
IConfig, none of which reads Deck's frozen $userId. If they cannot be
resolved, no mail is sent rather than one to the wrong people.

Moved cards are collected over the whole run and each recipient gets a
single digest mail afterwards, in their own language.

Bumps to 35.2.0 so the migrations run.

src/PersonalSettings.vue

@@ -34,7 +34,7 @@
 						</td>
 						<td>{{ stackLabel(workflow.boardId, workflow.sourceStackId) }}</td>
 						<td>{{ stackLabel(workflow.boardId, workflow.targetStackId) }}</td>
-						<td>{{ yesNo(workflow.notifyEmail) }}</td>
+						<td>{{ notifyLabel(workflow.notifyMode) }}</td>
 						<td>{{ yesNo(workflow.enabled) }}</td>
 						<td class="wfda-actions">
 							<NcButton variant="tertiary" @click="editWorkflow(workflow)">
@@ -88,9 +88,24 @@
 					:disabled="!form.boardId"
 					placeholder="Ziel-Stapel wählen" />
 
-				<NcCheckboxRadioSwitch v-model="form.notifyEmail">
-					Benachrichtigungs-E-Mail an mich senden
-				</NcCheckboxRadioSwitch>
+				<fieldset class="wfda-notify">
+					<legend>E-Mail bei verschobenen Karten</legend>
+					<NcCheckboxRadioSwitch
+						v-for="option in notifyOptions"
+						:key="option.value"
+						v-model="form.notifyMode"
+						type="radio"
+						name="wfda-notify-mode"
+						:value="option.value">
+						{{ option.label }}
+					</NcCheckboxRadioSwitch>
+					<p v-if="form.notifyMode === 'board'" class="wfda-hint">
+						Jedes Board-Mitglied bekommt die E-Mail entsprechend seiner eigenen
+						Deck-Einstellung „Benachrichtigungen“ für dieses Board: bei „Alle Karten“ immer,
+						bei „Zugewiesene Karten“ nur für Karten, denen es zugewiesen ist, bei „Keine“ nie.
+						Mehrere Karten eines Laufs werden zu einer E-Mail zusammengefasst.
+					</p>
+				</fieldset>
 
 				<NcCheckboxRadioSwitch v-model="form.enabled">
 					Workflow aktiv
@@ -166,7 +181,7 @@ const sortedWorkflows = computed(() => {
 		workflow.title,
 		stackLabel(workflow.boardId, workflow.sourceStackId),
 		stackLabel(workflow.boardId, workflow.targetStackId),
-		yesNo(workflow.notifyEmail),
+		notifyLabel(workflow.notifyMode),
 		yesNo(workflow.enabled),
 	]
 	return workflows.value
@@ -229,11 +244,22 @@ function emptyForm() {
 		boardId: null,
 		sourceStackId: null,
 		targetStackId: null,
-		notifyEmail: false,
+		notifyMode: 'off',
 		enabled: true,
 	}
 }
 
+// Values match NotificationPolicy::MODES on the server.
+const notifyOptions = [
+	{ value: 'off', label: 'Keine E-Mail', short: 'Keine' },
+	{ value: 'owner', label: 'Nur an mich', short: 'Nur ich' },
+	{ value: 'board', label: 'An Board-Mitglieder laut ihrer Deck-Einstellung', short: 'Board-Mitglieder' },
+]
+
+function notifyLabel(mode) {
+	return notifyOptions.find((option) => option.value === mode)?.short ?? mode
+}
+
 function boardLabel(boardId) {
 	const board = boards.value.find((entry) => entry.id === boardId)
 	return board ? board.title : `#${boardId}`
@@ -329,7 +355,7 @@ async function editWorkflow(workflow) {
 		boardId: workflow.boardId,
 		sourceStackId: workflow.sourceStackId,
 		targetStackId: workflow.targetStackId,
-		notifyEmail: workflow.notifyEmail,
+		notifyMode: workflow.notifyMode,
 		enabled: workflow.enabled,
 	})
 	editingId.value = workflow.id
@@ -437,6 +463,22 @@ onMounted(loadAll)
 	border-radius: var(--border-radius-large);
 }
 
+.wfda-notify {
+	display: flex;
+	flex-direction: column;
+	gap: 4px;
+}
+
+.wfda-notify legend {
+	font-weight: bold;
+	margin-bottom: 4px;
+}
+
+.wfda-hint {
+	color: var(--color-text-maxcontrast);
+	font-size: 0.9em;
+}
+
 .wfda-form-actions {
 	display: flex;
 	gap: 8px;