e2e: register and repair the settings/explore/social specs

settings.test.ts, explore.test.ts, and social.test.ts weren't matched
by any Playwright project, so they had silently never run — which is
how they rotted. Register them (one project each) and repair the
selectors against the current UI:

- settings: the page was split into sibling sections
  (/settings/{profile,security,account}); the spec assumed one page.
  Navigate to the right sub-page per test, use the stable section-nav
  links + #id input locators (the Vite dev server transiently
  double-renders the profile form during hydration, breaking
  getByLabel), and wait for hydration before interacting with
  fetcher-backed forms and the avatar dropdown.
- explore: setProfileVisibility now targets /settings/profile and
  waits for hydration so the visibility save uses the fetcher.
- social: already green once registered.

Also fixes an app bug the specs surfaced: deleting a passkey redirected
to /settings#security, a stale anchor that now resolves to
/settings/profile — so you'd land on the wrong section. It now
redirects to /settings/security.

Verified locally against Postgres/BRouter: green under CI-style
retries (the residual registration flake is the same cold-start class
the rest of the suite has, which is why CI runs retries=2).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

playwright.config.ts

@@ -16,7 +16,7 @@ export default defineConfig({
   },
   // NOTE: specs only run if a project below matches them — a new
   // e2e/*.test.ts file MUST be registered here or it silently never
-  // executes (settings/explore/social sat unregistered for months).
+  // executes.
   projects: [
     {
       name: "journal",
@@ -90,6 +90,30 @@ export default defineConfig({
         baseURL: "http://localhost:3000",
       },
     },
+    {
+      name: "settings",
+      testMatch: "settings.test.ts",
+      use: {
+        ...devices["Desktop Chrome"],
+        baseURL: "http://localhost:3000",
+      },
+    },
+    {
+      name: "explore",
+      testMatch: "explore.test.ts",
+      use: {
+        ...devices["Desktop Chrome"],
+        baseURL: "http://localhost:3000",
+      },
+    },
+    {
+      name: "social",
+      testMatch: "social.test.ts",
+      use: {
+        ...devices["Desktop Chrome"],
+        baseURL: "http://localhost:3000",
+      },
+    },
   ],
   webServer: process.env.CI
     ? [