improve dashboard usability and fix backend TS build errors

Frontend: fix HeroUI Switch usage across the whole app (Content/Control/
Thumb composition was missing, so no toggle ever rendered visibly),
replace raw channel/role ID text fields with proper name-based dropdowns
(ChannelSelect/RoleSelect) backed by the existing /guild/resources
endpoint, redesign Automod's filters as inline toggle rows, turn the
Ticket Pipeline tab into a drag-and-drop Kanban board, narrow the
sidebar further and rework its collapse toggle and profile footer, and
add a Discord-style message preview for Welcome/Support Login.

Backend: fix the ~50 TypeScript build errors blocking `npm run build`
(SlashCommandBuilder typing, discord.js v14 channel-union guards,
Prisma JSON null handling, logger.warn signature, and related type
narrowing) so the project compiles cleanly again.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

frontend/src/components/shared/AppSwitch.tsx

@@ -0,0 +1,32 @@
+import { Switch } from '@heroui/react';
+import type { ReactNode } from 'react';
+
+type Props = {
+  isSelected: boolean;
+  onChange: (value: boolean) => void;
+  label?: ReactNode;
+  description?: ReactNode;
+  isDisabled?: boolean;
+  size?: 'sm' | 'md' | 'lg';
+  'aria-label'?: string;
+};
+
+export function AppSwitch({ isSelected, onChange, label, description, isDisabled, size, ...rest }: Props) {
+  return (
+    <Switch
+      isSelected={isSelected}
+      onChange={onChange}
+      isDisabled={isDisabled}
+      size={size}
+      aria-label={!label ? rest['aria-label'] || 'Umschalten' : undefined}
+    >
+      <Switch.Content>
+        <Switch.Control>
+          <Switch.Thumb />
+        </Switch.Control>
+        {label && <span>{label}</span>}
+      </Switch.Content>
+      {description && <p data-slot="description" className="text-xs text-muted">{description}</p>}
+    </Switch>
+  );
+}