feat(auth): enable password login on OAuth-only accounts, with disable control

Admins can now reset the password of an OAuth-only user, which creates
their credentials and enables password login; the new 'Disable password
login' row action removes those credentials again. Resetting a password
revokes all existing sessions.

- add users.password_login_enabled column (migration 0005)
- admin reset: set password, enable login, revoke sessions
- disable action: clear password, disable login (only on OAuth-linked rows)
- account endpoint: refuse password updates on OAuth-linked users
- e2e: wipe the test DB before the webServer starts (Playwright starts
  the server before globalSetup, so wiping there orphaned the DB file)
- row-actions strip test: five square actions, wrap on phone widths

drizzle/0005_green_raider.sql

@@ -0,0 +1,2 @@
+ALTER TABLE `users` ADD `password_login_enabled` integer DEFAULT false NOT NULL;--> statement-breakpoint
+UPDATE `users` SET `password_login_enabled` = 1 WHERE `auth_provider` = 'password';

drizzle/meta/_journal.json

@@ -36,6 +36,13 @@
       "when": 1785824271578,
       "tag": "0004_violet_nicolaos",
       "breakpoints": true
+    },
+    {
+      "idx": 5,
+      "version": "6",
+      "when": 1787064677945,
+      "tag": "0005_green_raider",
+      "breakpoints": true
     }
   ]
 }