Wire up frontend: git status, history, sharing, AI verify

- Git sync button (green/red indicator) in toolbar
- History panel: view commits, click to restore
- Share dialog: share files with other users by username
- AI Verify button: sends spec to LiteLLM for review
- AI response panel with rendered markdown
- Auto-refresh git status on file open/save
- Watch for history panel open to load commits

frontend/src/App.vue

@@ -47,6 +47,12 @@
         <div class="toolbar-right">
           <span class="file-name">{{ currentFile || 'No file open' }}</span>
           <span class="file-meta" v-if="fileMeta">{{ fileMeta }}</span>
+          <button v-if="currentFile" class="toolbar-btn" @click="showHistory = !showHistory" title="History">📜</button>
+          <button v-if="currentFile" class="toolbar-btn" @click="showShareDialog = !showShareDialog" title="Share">🤝</button>
+          <button v-if="currentFile" class="toolbar-btn" @click="aiVerify" title="Verify with AI">🤖 Verify</button>
+          <button class="git-btn" :class="{dirty: gitDirty > 0}" @click="gitSync" :title="gitDirty > 0 ? gitDirty + ' uncommitted changes' : 'All synced'">
+            {{ gitDirty > 0 ? '🔴' : '🟢' }} Git
+          </button>
           <div class="export-actions" v-if="currentFile">
             <button @click="exportPDF" title="Export PDF">PDF</button>
             <button @click="exportHTML" title="Export HTML">HTML</button>
@@ -79,8 +85,46 @@
           <p v-else style="color:#6c7086;font-style:italic">Preview will appear here...</p>
         </div>
       </div>
+      <!-- History Panel -->
+      <div class="history-panel" v-if="showHistory">
+        <div class="panel-header">
+          <h3>History: {{ currentFile }}</h3>
+          <button @click="showHistory = false">✕</button>
+        </div>
+        <div class="history-list">
+          <div v-for="c in history" :key="c.hash" class="history-item" @click="restoreVersion(c.hash)">
+            <span class="history-hash">{{ c.hash.slice(0, 7) }}</span>
+            <span class="history-msg">{{ c.message }}</span>
+            <span class="history-date">{{ c.date }}</span>
+          </div>
+          <p v-if="!history.length" style="color:var(--text-muted);padding:12px">No history yet</p>
+        </div>
+      </div>
+      <!-- Share Dialog -->
+      <div class="share-dialog" v-if="showShareDialog">
+        <div class="panel-header">
+          <h3>Share: {{ currentFile }}</h3>
+          <button @click="showShareDialog = false">✕</button>
+        </div>
+        <form @submit.prevent="shareFile" class="share-form">
+          <input v-model="shareUsername" placeholder="Username to share with" />
+          <select v-model="shareLevel">
+            <option value="ro">Read only</option>
+            <option value="rw">Read & Write</option>
+          </select>
+          <button type="submit">Share</button>
+        </form>
+        <p v-if="shareMsg" class="share-msg">{{ shareMsg }}</p>
+      </div>
+      <!-- AI Panel -->
+      <div class="ai-panel" v-if="aiResult">
+        <div class="panel-header">
+          <h3>AI Response</h3>
+          <button @click="aiResult = ''">✕</button>
+        </div>
+        <div class="ai-content" v-html="renderMarkdown(aiResult)"></div>
+      </div>
     </main>
-    <!-- Preferences Panel -->
     <main class="panel" v-if="view === 'prefs'">
       <h2>Preferences</h2>
       <div class="panel-section">
@@ -147,7 +191,7 @@
 </template>
 
 <script setup>
-import { ref, computed } from 'vue'
+import { ref, computed, watch } from 'vue'
 import FileTree from './components/FileTree.vue'
 import MilkdownEditor from './components/MilkdownEditor.vue'
 import { api, setToken } from './lib/api.js'
@@ -172,6 +216,14 @@ const view = ref('files')
 const isAdmin = ref(false)
 const fileMeta = ref('')
 const sharedFiles = ref([])
+const showHistory = ref(false)
+const history = ref([])
+const showShareDialog = ref(false)
+const shareUsername = ref('')
+const shareLevel = ref('ro')
+const shareMsg = ref('')
+const gitDirty = ref(0)
+const aiResult = ref('')
 
 // Preferences
 const prefs = ref({ timezone: Intl.DateTimeFormat().resolvedOptions().timeZone, defaultMode: 'split', theme: 'dark' })
@@ -184,6 +236,8 @@ const adminMsg = ref('')
 
 const rendered = computed(() => renderMarkdown(content.value))
 
+watch(showHistory, (val) => { if (val) loadHistory() })
+
 function toggleTheme() {
   dark.value = !dark.value
   document.documentElement.setAttribute('data-theme', dark.value ? 'dark' : 'light')
@@ -246,12 +300,18 @@ async function openFile(path) {
   fileMeta.value = res.created ? `Created: ${formatDate(res.created)}` : ''
   isDirty.value = false
   view.value = 'files'
+  showHistory.value = false
+  showShareDialog.value = false
+  aiResult.value = ''
+  loadHistory()
+  checkGitStatus()
 }
 
 async function saveFile() {
   if (!currentFile.value) return
   await api('/api/files/write', { path: currentFile.value, content: content.value })
   isDirty.value = false
+  setTimeout(checkGitStatus, 1000)
 }
 
 async function createFile() {
@@ -335,6 +395,64 @@ function formatDate(d) {
   } catch { return d }
 }
 
+// ─── Git ─────────────────────────────────────────────────────────────────────
+
+async function checkGitStatus() {
+  try {
+    const res = await api('/api/git/status', {})
+    gitDirty.value = res.dirty || 0
+  } catch { gitDirty.value = 0 }
+}
+
+async function gitSync() {
+  await api('/api/git/commit', { message: 'Manual sync' })
+  await checkGitStatus()
+}
+
+// ─── History ─────────────────────────────────────────────────────────────────
+
+async function loadHistory() {
+  if (!currentFile.value) return
+  try {
+    history.value = await api('/api/git/log', { path: currentFile.value, limit: 20 })
+  } catch { history.value = [] }
+}
+
+async function restoreVersion(hash) {
+  if (!confirm(`Restore ${currentFile.value} to commit ${hash.slice(0, 7)}?`)) return
+  await api('/api/git/restore', { path: currentFile.value, hash })
+  const res = await api('/api/files/read', { path: currentFile.value })
+  content.value = res.content
+  isDirty.value = false
+  showHistory.value = false
+}
+
+// ─── Sharing ─────────────────────────────────────────────────────────────────
+
+async function shareFile() {
+  if (!shareUsername.value) return
+  try {
+    await api('/api/share', { path: currentFile.value, username: shareUsername.value, level: shareLevel.value })
+    shareMsg.value = `Shared with ${shareUsername.value} (${shareLevel.value})`
+    shareUsername.value = ''
+  } catch (e) {
+    shareMsg.value = 'Failed to share'
+  }
+}
+
+// ─── AI ──────────────────────────────────────────────────────────────────────
+
+async function aiVerify() {
+  if (!currentFile.value) return
+  aiResult.value = 'Verifying...'
+  try {
+    const res = await api('/api/ai/verify', { path: currentFile.value })
+    aiResult.value = res.feedback || 'No response'
+  } catch (e) {
+    aiResult.value = 'AI verification failed. Check MH_AI_ENDPOINT configuration.'
+  }
+}
+
 // ─── Formatting ──────────────────────────────────────────────────────────────
 
 function insertFormat(before, after) {
@@ -548,6 +666,7 @@ body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; }
   flex: 1;
   display: flex;
   flex-direction: column;
+  position: relative;
 }
 
 .toolbar {
@@ -803,6 +922,97 @@ body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; }
 
 .file-meta { color: var(--text-muted); font-size: 11px; }
 
+.toolbar-btn {
+  background: transparent;
+  color: var(--text);
+  border: 1px solid var(--border);
+  padding: 4px 10px;
+  border-radius: 4px;
+  cursor: pointer;
+  font-size: 12px;
+}
+.toolbar-btn:hover { background: var(--bg-hover); }
+
+.git-btn {
+  background: transparent;
+  color: var(--text);
+  border: 1px solid var(--border);
+  padding: 4px 10px;
+  border-radius: 4px;
+  cursor: pointer;
+  font-size: 12px;
+}
+.git-btn.dirty { border-color: var(--danger); }
+
+.history-panel, .share-dialog, .ai-panel {
+  position: absolute;
+  right: 0;
+  top: 50px;
+  width: 360px;
+  max-height: calc(100vh - 60px);
+  overflow-y: auto;
+  background: var(--bg-primary);
+  border-left: 1px solid var(--border);
+  border-bottom: 1px solid var(--border);
+  z-index: 20;
+  box-shadow: -2px 2px 8px rgba(0,0,0,0.3);
+}
+
+.panel-header {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  padding: 12px 16px;
+  border-bottom: 1px solid var(--border);
+}
+.panel-header h3 { font-size: 14px; }
+.panel-header button { background: none; border: none; color: var(--text-muted); cursor: pointer; font-size: 18px; }
+
+.history-list { padding: 8px; }
+.history-item {
+  display: flex;
+  gap: 8px;
+  padding: 8px;
+  border-radius: 4px;
+  cursor: pointer;
+  font-size: 12px;
+  align-items: center;
+}
+.history-item:hover { background: var(--bg-hover); }
+.history-hash { color: var(--accent); font-family: monospace; }
+.history-msg { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+.history-date { color: var(--text-muted); font-size: 11px; white-space: nowrap; }
+
+.share-form {
+  display: flex;
+  gap: 8px;
+  padding: 12px 16px;
+  align-items: center;
+}
+.share-form input, .share-form select {
+  padding: 6px 10px;
+  background: var(--bg-hover);
+  border: 1px solid var(--border);
+  border-radius: 4px;
+  color: var(--text);
+  font-size: 13px;
+}
+.share-form button {
+  padding: 6px 12px;
+  background: var(--accent);
+  color: var(--bg-primary);
+  border: none;
+  border-radius: 4px;
+  cursor: pointer;
+}
+.share-msg { padding: 0 16px 12px; font-size: 12px; color: var(--success); }
+
+.ai-content { padding: 16px; font-size: 14px; line-height: 1.6; }
+.ai-content h1, .ai-content h2, .ai-content h3 { margin: 12px 0 6px; }
+.ai-content p { margin: 0 0 12px; }
+.ai-content code { background: var(--code-bg); padding: 2px 6px; border-radius: 3px; }
+.ai-content ul, .ai-content ol { padding-left: 2em; margin: 0 0 12px; }
+
 /* ─── Responsive ──────────────────────────────────────────────────────────── */
 
 @media (max-width: 768px) {