diff --git a/patches/node-fetch-native-with-agent@1.7.2.patch b/patches/node-fetch-native-with-agent@1.7.2.patch
new file mode 100644
index 0000000..2351509
--- /dev/null
+++ b/patches/node-fetch-native-with-agent@1.7.2.patch
@@ -0,0 +1,34 @@
+diff --git a/dist/agent.cjs b/dist/agent.cjs
+index c623b82a03edb5e2c3423c36c9ee235f6ae74325..d2a0dcac815310b72fba4726f5b9023ff498f1af 100644
+--- a/dist/agent.cjs
++++ b/dist/agent.cjs
+@@ -1 +1,13 @@
+-"use strict";var u=Object.defineProperty;var o=(e,t)=>u(e,"name",{value:t,configurable:!0});const http=require("node:http"),https=require("node:https"),index=require("./shared/node-fetch-native-with-agent.df7e6bd6.cjs"),nodeFetchNativeWithAgent=require("node-fetch-native-with-agent");require("node:assert"),require("node:net"),require("node:stream"),require("node:buffer"),require("node:util"),require("node:querystring"),require("node:diagnostics_channel"),require("node:events"),require("./shared/node-fetch-native-with-agent.61758d11.cjs"),require("node:tls"),require("node:zlib"),require("node:perf_hooks"),require("node:util/types"),require("node:os"),require("node:url"),require("node:async_hooks"),require("node:console"),require("string_decoder"),require("node:worker_threads");var i=Object.defineProperty,r=o((e,t)=>i(e,"name",{value:t,configurable:!0}),"r");function createAgent(e,t={}){const n={rejectUnauthorized:t.rejectUnauthorized},c=e?.startsWith("https:")?new https.Agent(n):new http.Agent,s=new index.Agent_1({connect:n});return{agent:c,dispatcher:s}}o(createAgent,"createAgent"),r(createAgent,"createAgent");function createFetch(e={}){const t=createAgent(void 0,e);return(n,c)=>nodeFetchNativeWithAgent.fetch(n,{...t,...c})}o(createFetch,"createFetch"),r(createFetch,"createFetch");const fetch=createFetch({});exports.createAgent=createAgent,exports.createFetch=createFetch,exports.fetch=fetch;
++"use strict";
++// Patched: bypass bundled undici Agent that crashes on Node 26 (UND_ERR_INVALID_ARG).
++// node-appwrite calls createFetch()(url, opts); route to native global fetch.
++function createAgent() {
++  return {};
++}
++function createFetch() {
++  return (input, init) => globalThis.fetch(input, init);
++}
++const fetch = (input, init) => globalThis.fetch(input, init);
++exports.createAgent = createAgent;
++exports.createFetch = createFetch;
++exports.fetch = fetch;
+diff --git a/dist/agent.mjs b/dist/agent.mjs
+index ef96ec1e9791791736856775a81383dd02d52e40..a5e381da653086facdaec519a84de065a4bbf1aa 100644
+--- a/dist/agent.mjs
++++ b/dist/agent.mjs
+@@ -1 +1,9 @@
+-var a=Object.defineProperty;var o=(t,r)=>a(t,"name",{value:r,configurable:!0});import{Agent as f}from"node:http";import{Agent as h}from"node:https";import{A as s}from"./shared/node-fetch-native-with-agent.56860586.mjs";import{fetch as g}from"node-fetch-native-with-agent";import"node:assert";import"node:net";import"node:stream";import"node:buffer";import"node:util";import"node:querystring";import"node:diagnostics_channel";import"node:events";import"./shared/node-fetch-native-with-agent.1a4a356d.mjs";import"node:tls";import"node:zlib";import"node:perf_hooks";import"node:util/types";import"node:os";import"node:url";import"node:async_hooks";import"node:console";import"string_decoder";import"node:worker_threads";var u=Object.defineProperty,p=o((t,r)=>u(t,"name",{value:r,configurable:!0}),"r");function m(t,r={}){const e={rejectUnauthorized:r.rejectUnauthorized},i=t?.startsWith("https:")?new h(e):new f,c=new s({connect:e});return{agent:i,dispatcher:c}}o(m,"createAgent"),p(m,"createAgent");function n(t={}){const r=m(void 0,t);return(e,i)=>g(e,{...r,...i})}o(n,"createFetch"),p(n,"createFetch");const A=n({});export{m as createAgent,n as createFetch,A as fetch};
++// Patched: bypass bundled undici Agent that crashes on Node 26 (UND_ERR_INVALID_ARG).
++function createAgent() {
++  return {};
++}
++function createFetch() {
++  return (input, init) => globalThis.fetch(input, init);
++}
++const fetch = (input, init) => globalThis.fetch(input, init);
++export { createAgent, createFetch, fetch };
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 0722f22..cb3f944 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -4,6 +4,9 @@ settings:
   autoInstallPeers: true
   excludeLinksFromLockfile: false
 
+patchedDependencies:
+  node-fetch-native-with-agent@1.7.2: cd358d4fe49343db480f143ab35ddda3c2c50e5009876fca55e5e823ae72ceed
+
 importers:
 
   .:
@@ -5424,9 +5427,9 @@ snapshots:
   node-appwrite@23.1.0:
     dependencies:
       json-bigint: 1.0.0
-      node-fetch-native-with-agent: 1.7.2
+      node-fetch-native-with-agent: 1.7.2(patch_hash=cd358d4fe49343db480f143ab35ddda3c2c50e5009876fca55e5e823ae72ceed)
 
-  node-fetch-native-with-agent@1.7.2: {}
+  node-fetch-native-with-agent@1.7.2(patch_hash=cd358d4fe49343db480f143ab35ddda3c2c50e5009876fca55e5e823ae72ceed): {}
 
   node-releases@2.0.27: {}
 
diff --git a/pnpm-workspace.yaml b/pnpm-workspace.yaml
index dd1b4fd..3c5a43d 100644
--- a/pnpm-workspace.yaml
+++ b/pnpm-workspace.yaml
@@ -1,3 +1,5 @@
 allowBuilds:
   sharp: true
   unrs-resolver: true
+patchedDependencies:
+  node-fetch-native-with-agent@1.7.2: patches/node-fetch-native-with-agent@1.7.2.patch
diff --git a/src/lib/appwrite/auth-actions.ts b/src/lib/appwrite/auth-actions.ts
index bbdd5a9..3fb5631 100644
--- a/src/lib/appwrite/auth-actions.ts
+++ b/src/lib/appwrite/auth-actions.ts
@@ -27,6 +27,9 @@ function appwriteError(e: unknown): string {
         return e.message || "Beklenmeyen bir hata oluştu.";
     }
   }
+  if (process.env.NODE_ENV !== "production" && e instanceof Error) {
+    return `Bağlantı hatası: ${e.message}`;
+  }
   return "Bağlantı hatası. Tekrar deneyin.";
 }
 
@@ -90,6 +93,7 @@ export async function signInAction(_prev: AuthState, formData: FormData): Promis
     sessionId = session.$id;
     await setSessionCookie(session.secret, session.expire);
   } catch (e) {
+    console.error("[signInAction] createEmailPasswordSession", e);
     return { ok: false, error: appwriteError(e) };
   }