v0.30.2: header nav label "Philosophy" -> "About"

Revert the §14.3 persistent chrome link's display text from "Philosophy"
back to "About" (relabeled in v0.21.0). Display text only — route
/philosophy, the header-about class, and the page are unchanged. Patch
per SPEC §20.2: cosmetic, no deployment action beyond a frontend rebuild.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend/package.json

@@ -1,7 +1,7 @@
 {
   "name": "rfc-app-frontend",
   "private": true,
-  "version": "0.30.1",
+  "version": "0.30.2",
   "type": "module",
   "scripts": {
     "dev": "vite",