feat: Sign in with OTM styled as the one primary action (v0.6.1)

names has no local accounts, so OTM sign-in is the only door — style
it like the house's primary button instead of a plain text link, with
a muted line underneath about Face ID/Touch ID/passkeys, matching the
shared first-party sign-in standard. No "other ways to sign in" toggle
since there's nothing else to switch to.

Also syncs package-lock.json's stale root version and picks up the
already-declared tailwindcss/postcss/autoprefixer entries it was
missing.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014LCQmFvKshyAJsE8C3B5ET

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "names-poweredbyotm",
-  "version": "0.1.0",
+  "version": "0.6.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "names-poweredbyotm",
-      "version": "0.1.0",
+      "version": "0.6.1",
       "dependencies": {
         "@otm/account-panel": "0.32.0",
         "next": "^15.1.0",