auth: route tenant-less sign-in to onboarding instead of erroring out

Previously, signing in with a kind toggle when the account had no
tenant_settings row in the lab database returned 'Bu hesap için kayıt
bulunamadı'. For a freshly-imported isletmem user that has never opened
DLS, the right behaviour is onboarding — not a dead end.

resolveTenantOnLogin now distinguishes three states:
  - no_tenants  → redirect /onboarding?kind=<pill>  (session stays)
  - mismatch    → real error naming the existing kind, session rolled back
  - matched     → existing tenant set as active, /dashboard

Onboarding page accepts ?kind= and the workspace form pre-selects it, so
the user keeps their login pill choice without re-picking. Also fixed the
'teams.total > 0' redirect — it now requires a tenant_settings row before
sending users off to /dashboard, otherwise users with cross-app teams but
no DLS workspace would bounce.

src/app/onboarding/components/create-workspace-form.tsx

@@ -17,10 +17,15 @@ type Kind = "lab" | "clinic";
 interface Props {
   userName?: string;
   crossAppTeams?: Array<{ $id: string; name: string }>;
+  initialKind?: Kind | null;
 }
 
-export function CreateWorkspaceForm({ userName, crossAppTeams = [] }: Props) {
-  const [kind, setKind] = useState<Kind | null>(null);
+export function CreateWorkspaceForm({
+  userName,
+  crossAppTeams = [],
+  initialKind = null,
+}: Props) {
+  const [kind, setKind] = useState<Kind | null>(initialKind);
   const [state, formAction, isPending] = useActionState(
     createWorkspaceAction,
     initialWorkspaceState,

src/app/onboarding/page.tsx

@@ -1,7 +1,9 @@
 import type { Metadata } from "next";
 import { redirect } from "next/navigation";
+import { Query } from "node-appwrite";
 
-import { getCurrentUser } from "@/lib/appwrite/server";
+import { createAdminClient, getCurrentUser } from "@/lib/appwrite/server";
+import { DATABASE_ID, TABLES, type TenantKind } from "@/lib/appwrite/schema";
 import { getUserTeams, getCrossAppTeams } from "@/lib/appwrite/tenant";
 import { CreateWorkspaceForm } from "./components/create-workspace-form";
 
@@ -10,21 +12,43 @@ export const metadata: Metadata = {
   description: "DLS için ilk çalışma alanınızı kurun.",
 };
 
-export default async function OnboardingPage() {
+export default async function OnboardingPage({
+  searchParams,
+}: {
+  searchParams: Promise<{ kind?: string }>;
+}) {
   const user = await getCurrentUser();
   if (!user) redirect("/sign-in");
 
+  // Already has a DLS tenant? Send to dashboard. Cross-app teams without a
+  // tenant_settings row in `lab` still belong on onboarding.
   const teams = await getUserTeams();
-  if (teams && teams.total > 0) redirect("/dashboard");
+  if (teams && teams.total > 0) {
+    const { tablesDB } = createAdminClient();
+    const existing = await tablesDB.listRows({
+      databaseId: DATABASE_ID,
+      tableId: TABLES.tenantSettings,
+      queries: [
+        Query.equal("tenantId", teams.teams.map((t) => t.$id)),
+        Query.limit(1),
+      ],
+    });
+    if (existing.total > 0) redirect("/dashboard");
+  }
 
   const crossAppTeams = await getCrossAppTeams();
 
+  const { kind: rawKind } = await searchParams;
+  const initialKind: TenantKind | null =
+    rawKind === "lab" || rawKind === "clinic" ? rawKind : null;
+
   return (
     <div className="bg-muted flex min-h-svh flex-col items-center justify-center p-6 md:p-10">
       <div className="w-full max-w-md">
         <CreateWorkspaceForm
           userName={user.name?.split(" ")[0]}
           crossAppTeams={crossAppTeams}
+          initialKind={initialKind}
         />
       </div>
     </div>

src/lib/appwrite/auth-actions.ts

@@ -53,23 +53,33 @@ async function setActiveTenantCookie(tenantId: string) {
   });
 }
 
-async function pickTenantIdByKind(userId: string, kind: TenantKind): Promise<string | null> {
+type LoginResolution =
+  | { state: "no_tenants" }
+  | { state: "mismatch"; existingKinds: TenantKind[] }
+  | { state: "matched"; tenantId: string };
+
+async function resolveTenantOnLogin(
+  userId: string,
+  kind: TenantKind,
+): Promise<LoginResolution> {
   const { users, tablesDB } = createAdminClient();
-  const memberships = await users.listMemberships(userId);
+  const memberships = await users.listMemberships({ userId });
   const teamIds = memberships.memberships.map((m) => m.teamId);
-  if (teamIds.length === 0) return null;
+  if (teamIds.length === 0) return { state: "no_tenants" };
 
   const result = await tablesDB.listRows({
     databaseId: DATABASE_ID,
     tableId: TABLES.tenantSettings,
-    queries: [
-      Query.equal("tenantId", teamIds),
-      Query.equal("kind", kind),
-      Query.limit(1),
-    ],
+    queries: [Query.equal("tenantId", teamIds), Query.limit(50)],
   });
-  const row = result.rows[0] as unknown as TenantSettings | undefined;
-  return row?.tenantId ?? null;
+  const rows = result.rows as unknown as TenantSettings[];
+  if (rows.length === 0) return { state: "no_tenants" };
+
+  const match = rows.find((r) => r.kind === kind);
+  if (match) return { state: "matched", tenantId: match.tenantId };
+
+  const existingKinds = Array.from(new Set(rows.map((r) => r.kind)));
+  return { state: "mismatch", existingKinds };
 }
 
 export async function signInAction(_prev: AuthState, formData: FormData): Promise<AuthState> {
@@ -98,37 +108,62 @@ export async function signInAction(_prev: AuthState, formData: FormData): Promis
   }
 
   // Invite flow short-circuits the kind check — invite code drives team membership
-  if (!inviteCode && kind && sessionUserId) {
-    const matchedTenantId = await pickTenantIdByKind(sessionUserId, kind);
-    if (!matchedTenantId) {
-      // Roll back session: user has no tenant of the requested kind
+  if (inviteCode) {
+    redirect(`/d/${inviteCode}`);
+  }
+
+  if (kind && sessionUserId) {
+    let resolution: LoginResolution;
+    try {
+      resolution = await resolveTenantOnLogin(sessionUserId, kind);
+    } catch (e) {
+      console.error("[signInAction] resolveTenantOnLogin", e);
+      // Tenant resolution failed: keep the session, send user to onboarding
+      // so they can recover instead of getting locked out.
+      redirect("/onboarding");
+    }
+
+    if (resolution.state === "no_tenants") {
+      // Authenticated user with no workspace yet — carry the kind into onboarding
+      redirect(`/onboarding?kind=${kind}`);
+    }
+
+    if (resolution.state === "mismatch") {
       try {
         const { users } = createAdminClient();
-        if (sessionId) await users.deleteSession(sessionUserId, sessionId);
+        if (sessionId) await users.deleteSession({ userId: sessionUserId, sessionId });
       } catch {
         /* best-effort */
       }
       (await cookies()).delete(APPWRITE_SESSION_COOKIE);
-      const label = kind === "lab" ? "laboratuvar" : "klinik";
+      const requested = kind === "lab" ? "laboratuvar" : "klinik";
+      const existingLabel = resolution.existingKinds
+        .map((k) => (k === "lab" ? "laboratuvar" : "klinik"))
+        .join(" / ");
       return {
         ok: false,
-        error: `Bu hesap için ${label} kaydı bulunamadı. Diğer hesap türünü seçin veya yeni çalışma alanı oluşturun.`,
+        error: `Bu hesap ${existingLabel} olarak kayıtlı. ${requested} sekmesinden değil, ${existingLabel} sekmesinden giriş yapın.`,
       };
     }
-    await setActiveTenantCookie(matchedTenantId);
+
+    // matched
+    await setActiveTenantCookie(resolution.tenantId);
     try {
       const { users } = createAdminClient();
-      const user = await users.get(sessionUserId);
-      await users.updatePrefs(sessionUserId, {
-        ...(user.prefs ?? {}),
-        activeTenant: matchedTenantId,
+      const user = await users.get({ userId: sessionUserId });
+      await users.updatePrefs({
+        userId: sessionUserId,
+        prefs: {
+          ...(user.prefs ?? {}),
+          activeTenant: resolution.tenantId,
+        },
       });
     } catch {
       /* best-effort */
     }
   }
 
-  redirect(inviteCode ? `/d/${inviteCode}` : "/dashboard");
+  redirect("/dashboard");
 }
 
 export async function signUpAction(_prev: AuthState, formData: FormData): Promise<AuthState> {