Implement leave announcement for banned members and enhance moderation notifications

- Added a `leaveAnnounceBan` field to the `WelcomeConfig` model, allowing for optional announcements in the leave channel when a member is banned.
- Updated the leave handling logic to check for bans and send a notice in the leave channel if the `leaveAnnounceBan` toggle is enabled.
- Enhanced moderation actions (kick and ban) to notify the affected user via DM with the reason for the action.
- Introduced a new `notifyModerationTargetDm` function to streamline DM notifications for moderation actions.
- Updated the WebUI to include a toggle for the `leaveAnnounceBan` feature, improving user configurability.
- Improved localization for new messages related to moderation notifications and leave announcements in both English and German.
- Documented changes in phase tracking to reflect the new leave announcement feature and moderation notification enhancements.

apps/webui/src/components/modules/welcome-form.tsx

@@ -252,6 +252,22 @@ export function WelcomeForm({ guildId, initialValue, previewVars }: WelcomeFormP
                 />
               </div>
               </FieldAnchor>
+              <FieldAnchor id="field-leave-announce-ban">
+              <div className="flex items-center justify-between gap-4 rounded-md border border-border p-4">
+                <div className="space-y-1">
+                  <Label>{t('modulePages.welcome.leaveAnnounceBanLabel')}</Label>
+                  <p className="text-sm text-muted-foreground">
+                    {t('modulePages.welcome.leaveAnnounceBanHint')}
+                  </p>
+                </div>
+                <Switch
+                  checked={value.leaveAnnounceBan}
+                  onCheckedChange={(checked) =>
+                    setValue((prev) => ({ ...prev, leaveAnnounceBan: checked }))
+                  }
+                />
+              </div>
+              </FieldAnchor>
               <FieldAnchor id="field-leave-channel">
               <div className="space-y-2">
                 <Label>{t('modulePages.welcome.leaveChannelId')}</Label>

apps/webui/src/lib/dashboard-search-index.ts

@@ -309,6 +309,14 @@ export const SETTINGS_SEARCH_FIELDS: SearchIndexEntry[] = [
     href: 'welcome',
     hash: 'field-leave-enabled'
   },
+  {
+    id: 'setting-leave-announce-ban',
+    kind: 'setting',
+    labelKey: 'modulePages.welcome.leaveAnnounceBanLabel',
+    href: 'welcome',
+    hash: 'field-leave-announce-ban',
+    keywords: ['ban', 'leave', 'moderation']
+  },
   {
     id: 'setting-leave-channel',
     kind: 'setting',

apps/webui/src/lib/module-configs/welcome.ts

@@ -42,6 +42,7 @@ function toDashboard(config: Awaited<ReturnType<typeof ensureWelcomeConfig>>): W
     leaveContent: config.leaveContent,
     leaveEmbed: parseEmbed(config.leaveEmbed),
     leaveComponents: parseComponents(config.leaveComponents),
+    leaveAnnounceBan: config.leaveAnnounceBan,
     welcomeDmEnabled: config.welcomeDmEnabled,
     welcomeDmContent: config.welcomeDmContent,
     userAutoroleIds: config.userAutoroleIds,

apps/webui/src/messages/de.json

@@ -549,6 +549,9 @@
       "leaveTitle": "Abschied",
       "leaveDescription": "Nachricht und Kanal, wenn ein Mitglied den Server verlässt.",
       "leaveEnabledLabel": "Abschiedsnachricht aktiviert",
+      "leaveAnnounceBanLabel": "Ban im Abschieds-Kanal melden",
+      "leaveAnnounceBanHint":
+        "Zusätzlich zur Abschiedsnachricht anzeigen, wenn das Mitglied gebannt wurde (inkl. Grund).",
       "leaveChannelId": "Abschieds-Kanal-ID",
       "leaveType": "Nachrichtentyp",
       "leaveTypes": {

apps/webui/src/messages/en.json

@@ -549,6 +549,9 @@
       "leaveTitle": "Leave",
       "leaveDescription": "Message and channel when a member leaves the server.",
       "leaveEnabledLabel": "Leave message enabled",
+      "leaveAnnounceBanLabel": "Announce bans in leave channel",
+      "leaveAnnounceBanHint":
+        "Also post in the leave channel when the member was banned (including reason).",
       "leaveChannelId": "Leave channel ID",
       "leaveType": "Message type",
       "leaveTypes": {