feat(auth): base available login methods off GoTrue providers (#1869)

* feat(auth): base login fields on GoTrue providers

Signed-off-by: Goostaf <gasplund2@gmail.com>

# Conflicts:
#	app/(auth)/login/login-client.tsx
#	app/(auth)/register/page.tsx

* fix: address feedback

Signed-off-by: Goostaf <gasplund2@gmail.com>

* chore: remove hardcoded Google enabled checks

Signed-off-by: Goostaf <gasplund2@gmail.com>

# Conflicts:
#	.env.example

* feat: show label when password login is disabled

Signed-off-by: Goostaf <gasplund2@gmail.com>

* feat: use MicrosoftMark, correct comment

Signed-off-by: Goostaf <gasplund2@gmail.com>

* feat: display custom providers

Signed-off-by: Goostaf <gasplund2@gmail.com>

* feat: show when no methods are available

Signed-off-by: Goostaf <gasplund2@gmail.com>

* feat: display custom provider labels

Signed-off-by: Goostaf <gasplund2@gmail.com>

* feat: add SAML login path

Signed-off-by: Goostaf <gasplund2@gmail.com>

* feat: show when no methods are available

Signed-off-by: Goostaf <gasplund2@gmail.com>

* fix: display SAML button when enabled

Signed-off-by: Goostaf <gasplund2@gmail.com>

* fix: preserve nextPath and broken key

Signed-off-by: Goostaf <gasplund2@gmail.com>

* fix: redirect test to client

Signed-off-by: Goostaf <gasplund2@gmail.com>

* fix: expose registerEnabled

Signed-off-by: Goostaf <gasplund2@gmail.com>

* feat: provider allowlist and request timeout

Signed-off-by: Goostaf <gasplund2@gmail.com>

* fix: restore compact labels

Signed-off-by: Goostaf <gasplund2@gmail.com>

* refactor: move withTimeout implementation to utils

Signed-off-by: Goostaf <gasplund2@gmail.com>

* fix: include nextPath

Signed-off-by: Goostaf <gasplund2@gmail.com>

* fix: export function and test case

Signed-off-by: Goostaf <gasplund2@gmail.com>

* feat: only show SAML button if vars configured

Signed-off-by: Goostaf <gasplund2@gmail.com>

* fix(auth): map SAML sign-in error through getErrorMessage

The antipattern ratchet (check:guards, raw-user-error) rejects a raw
error.message reaching a user-visible sink. Route the signInWithSSO
error through getErrorMessage like the other auth error paths.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013BAzJjXQBa9F5L1U42wUMj
Signed-off-by: Jakob Wennberg <311770904+jakobwennberg-oss@users.noreply.github.com>

* feat(auth): GitHub brand mark on the provider button; decision log

GitHub allows its invertocat in solid black/white, so currentColor is
correct; custom OIDC providers keep the generic key icon.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013BAzJjXQBa9F5L1U42wUMj
Signed-off-by: Jakob Wennberg <311770904+jakobwennberg-oss@users.noreply.github.com>

---------

Signed-off-by: Goostaf <gasplund2@gmail.com>
Signed-off-by: Jakob Wennberg <311770904+jakobwennberg-oss@users.noreply.github.com>
Co-authored-by: Jakob Wennberg <311770904+jakobwennberg-oss@users.noreply.github.com>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

lib/utils.ts

@@ -198,3 +198,23 @@ export function generateInvoiceNumber(): string {
 export function isValidExchangeRate(rate: number | null | undefined): rate is number {
   return rate != null && rate > 0 && rate < 100000
 }
+
+// Run a promise against a wall-clock budget. The underlying work continues to
+// completion on the server when the budget elapses: we just stop waiting for
+// it. For Anthropic calls that's fine: a slow Opus turn finishing later still
+// warms its own cache.
+export function withTimeout<T>(promise: Promise<T>, ms: number): Promise<T> {
+  return new Promise<T>((resolve, reject) => {
+    const timer = setTimeout(() => reject(new Error(`Timeout after ${ms}ms`)), ms)
+    promise.then(
+      (v) => {
+        clearTimeout(timer)
+        resolve(v)
+      },
+      (e) => {
+        clearTimeout(timer)
+        reject(e)
+      },
+    )
+  })
+}