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/components/layout/dashboard-shell.tsx

@@ -18,6 +18,8 @@ interface DashboardShellProps {
   otherGuilds: DashboardGuild[];
   user: SessionUser;
   showOwnerLink?: boolean;
+  /** True when an Owner-panel user opened a guild they do not manage on Discord. */
+  ownerBypass?: boolean;
   children: ReactNode;
 }
 
@@ -27,6 +29,7 @@ export function DashboardShell({
   otherGuilds,
   user,
   showOwnerLink = false,
+  ownerBypass = false,
   children
 }: DashboardShellProps) {
   const t = useTranslations();
@@ -59,7 +62,21 @@ export function DashboardShell({
           </div>
         </header>
         <main className="flex-1 px-4 py-6 sm:px-6 sm:py-8">
-          <div className="mx-auto w-full max-w-[1200px]">{children}</div>
+          <div className="mx-auto w-full max-w-[1200px] space-y-4">
+            {ownerBypass ? (
+              <div className="rounded-md border border-amber-500/40 bg-amber-500/10 px-4 py-3 text-sm text-amber-100">
+                <p className="font-medium">{t('dashboard.ownerBypass.title')}</p>
+                <p className="mt-1 text-amber-100/80">{t('dashboard.ownerBypass.description')}</p>
+                <a
+                  href="/owner/guilds"
+                  className="mt-2 inline-block text-sm font-medium text-amber-50 underline underline-offset-4 hover:text-white"
+                >
+                  {t('dashboard.ownerBypass.backToOwner')}
+                </a>
+              </div>
+            ) : null}
+            {children}
+          </div>
         </main>
       </div>
     </div>

apps/webui/src/components/owner/owner-forms.tsx

@@ -1,5 +1,6 @@
 'use client';
 
+import Link from 'next/link';
 import { useRouter } from 'next/navigation';
 import { useMemo, useState, useTransition } from 'react';
 import { toast } from 'sonner';
@@ -165,6 +166,9 @@ export function GuildsManager({
                     </div>
                   </div>
                   <div className="flex flex-wrap gap-2">
+                    <Button size="sm" variant="default" asChild>
+                      <Link href={`/dashboard/${guild.id}`}>{t('owner.guilds.openDashboard')}</Link>
+                    </Button>
                     <Button
                       size="sm"
                       variant="outline"