fix(zed-hosted): add connection test support for Zed Hosted Models (#10810)

Adds Zed Hosted Models to OAUTH_TEST_CONFIG so the dashboard connection test no longer reports "Provider test not supported" for that provider.

Validated in an isolated worktree boarded onto origin/release/v3.8.50 (0 conflicts, 1 file):
- tests/unit/oauth-test-config-8408.test.ts (including its "every OAuth provider ID has an OAUTH_TEST_CONFIG entry" check) — 3/3 pass.
- check-file-size, check-changelog-integrity: OK.
- typecheck:core: clean.
- check-complexity / check-cognitive-complexity: OK, both under baseline.

Co-authored-by: Hsia97 <Hsia97@users.noreply.github.com>

src/app/api/providers/[id]/test/oauthTestConfig.ts

@@ -213,6 +213,12 @@ export const OAUTH_TEST_CONFIG: Record<string, OAuthTestConfigEntry> = {
     // Test Connection persists testStatus="error" on a healthy account (#8408).
     checkExpiry: true,
   },
+  "zed-hosted": {
+    // Zed Hosted Models uses a long-lived native-app access token with no
+    // expiry or refresh token. Validate presence here; real connectivity is
+    // exercised by chat requests through the ZedHostedExecutor.
+    checkExpiry: true,
+  },
   cline: CLINE_OAUTH_TEST_CONFIG,
   // ClinePass reuses the same WorkOS OAuth flow and token lifecycle as Cline.
   clinepass: CLINE_OAUTH_TEST_CONFIG,