Enhance dashboard guild access with owner bypass functionality

- Introduced `resolveDashboardGuild` to handle guild resolution for both managed and owner-panel bypass scenarios.
- Updated `GuildLayout` and `WelcomePage` components to utilize the new guild resolution logic, improving access handling.
- Enhanced `DashboardShell` to display an informational banner for users accessing guilds via the owner-panel bypass.
- Added localization support for owner bypass messages in English and German.
- Updated authentication logic to allow owner-panel users to access guilds without Discord Manage Guild permission.

apps/webui/src/app/dashboard/[guildId]/layout.tsx

@@ -2,7 +2,7 @@ import { notFound } from 'next/navigation';
 import type { ReactNode } from 'react';
 import { DashboardShell } from '@/components/layout/dashboard-shell';
 import { requireGuildAccessOrRedirect } from '@/lib/auth';
-import { getManageableGuilds } from '@/lib/guilds';
+import { getManageableGuilds, resolveDashboardGuild } from '@/lib/guilds';
 import { isOwnerUser } from '@/lib/owner-auth';
 
 interface GuildLayoutProps {
@@ -13,23 +13,26 @@ interface GuildLayoutProps {
 export default async function GuildLayout({ children, params }: GuildLayoutProps) {
   const { guildId } = await params;
   const session = await requireGuildAccessOrRedirect(guildId);
-  const guilds = await getManageableGuilds(session);
-  const currentGuild = guilds.find((guild) => guild.id === guildId);
+  const [resolved, guilds, showOwnerLink] = await Promise.all([
+    resolveDashboardGuild(session, guildId),
+    getManageableGuilds(session),
+    isOwnerUser(session.user.id)
+  ]);
 
-  if (!currentGuild) {
+  if (!resolved) {
     notFound();
   }
 
   const otherGuilds = guilds.filter((guild) => guild.id !== guildId);
-  const showOwnerLink = await isOwnerUser(session.user.id);
 
   return (
     <DashboardShell
       guildId={guildId}
-      currentGuild={currentGuild}
+      currentGuild={resolved.guild}
       otherGuilds={otherGuilds}
       user={session.user}
       showOwnerLink={showOwnerLink}
+      ownerBypass={resolved.ownerBypass}
     >
       {children}
     </DashboardShell>