feat(arcrun): mira wiki page with tag filter + accumulated WIP

- landing/app/mira/wiki: tag=mira-wiki list now shows all wiki paragraphs
  (depends on KBDB tag filter exposed in matrix/kbdb commit, separate repo)
- landing: app/mira hub + feed split + various WIP from prior sessions
- registry/components: claude_api / kbdb_create_block / kbdb_get / km_writer /
  platform_crypto / auth_oauth2 contracts + main.go (accumulated)
- .component-builds: pkg-lock updates + index.ts adjustments (WIP)
- .agents/specs/arcrun/frontend-redesign: design notes
- docs/test_credentials, docs/user_requirements/arcrun-landing-page: WIP docs
- cypher-executor: auth-dispatcher / wasi-shim adjustments (WIP)

Includes accumulated work from prior sessions plus the wiki UI tag-filter
update that surfaces the AI-generated wiki paragraphs at /mira/wiki.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

landing/app/dashboard/page.tsx

@@ -2,6 +2,7 @@
 
 import { useEffect, useState, useCallback } from 'react';
 import Link from 'next/link';
+import SiteNav from '../components/SiteNav';
 
 const API_BASE = process.env.NEXT_PUBLIC_API_BASE ?? 'https://cypher.arcrun.dev';
 
@@ -89,11 +90,6 @@ export default function DashboardPage() {
     }
   };
 
-  const logout = async () => {
-    await fetch(`${API_BASE}/auth/logout`, { method: 'POST', credentials: 'include' });
-    window.location.href = '/';
-  };
-
   if (loading) {
     return (
       <div className="min-h-screen bg-[#0a0a0a] flex items-center justify-center">
@@ -115,22 +111,7 @@ export default function DashboardPage() {
 
   return (
     <div className="min-h-screen bg-[#0a0a0a] text-[#ededed]">
-      {/* Nav */}
-      <nav className="flex items-center justify-between px-6 py-4 border-b border-[#1a1a1a]">
-        <Link href="/" className="text-white font-bold text-lg tracking-tight hover:opacity-80 transition-opacity">
-          arcrun
-        </Link>
-        <div className="flex items-center gap-4">
-          {user.avatar_url && (
-            // eslint-disable-next-line @next/next/no-img-element
-            <img src={user.avatar_url} alt="" width={28} height={28} className="rounded-full" />
-          )}
-          <span className="text-[#666] text-sm">{user.email}</span>
-          <button onClick={logout} className="text-[#555] hover:text-[#888] text-sm transition-colors cursor-pointer">
-            登出
-          </button>
-        </div>
-      </nav>
+      <SiteNav currentPath="/dashboard" />
 
       <main className="max-w-2xl mx-auto px-6 py-12">
         <h1 className="text-2xl font-bold text-white mb-1">歡迎，{user.display_name}</h1>