Fix Mantine v9 CI failures for typecheck, lint, and e2e.

Align form generics with v9 TransformedValues typing, merge element-size refs for gridstack, and tighten selectors and lint fixes from the migration.

e2e/lldap.spec.ts

@@ -45,7 +45,7 @@ describe("LLDAP authorization", () => {
     // Act
     await page.goto(`http://${homarrContainer.getHost()}:${homarrContainer.getMappedPort(7575)}/auth/login`);
     await page.getByLabel("Username").fill(defaultCredentials.username);
-    await page.getByLabel("Password").fill(defaultCredentials.password);
+    await page.locator("#password").fill(defaultCredentials.password);
     await page.locator("css=button[type='submit']").click();
 
     // Assert