feat: move seed loading to admin profile page, add password change

- 'Load Seed Protocols' button now appears on the admin's own profile
  page instead of the About page. Can be repeated to re-import seeds.
- After loading, the profile refreshes to show updated protocol list.
- 'Change Password' button also appears on own profile page for all
  users (not just admin), opening a modal with current/new/confirm fields.
- Password modal added to HTML.
- README updated: seed loading instructions point to profile page,
  mentions 100 protocols, notes repeat seeding is supported.

frontend/app.js

@@ -63,7 +63,6 @@ async function init() {
 }
 
 function route() {
-  isRouting = true;
   const hash = location.hash.slice(1) || 'library';
   if (hash.startsWith('protocols/')) {
     showDetail(hash.split('/')[1]);
@@ -82,15 +81,14 @@ function route() {
   } else {
     navigate('library');
   }
-  isRouting = false;
 }
 
 let searchTimer = null;
 let currentRoute = '';
-let isRouting = false;
 
 function navigate(view) {
-  if (currentRoute === view && view !== 'library') return;
+  // Prevent double navigation from hashchange
+  if (currentRoute === view) return;
   currentRoute = view;
   document.querySelectorAll('.view').forEach(v => v.style.display = 'none');
   document.getElementById('view-' + view).style.display = 'block';
@@ -98,17 +96,11 @@ function navigate(view) {
   document.querySelectorAll('.mobile-panel a').forEach(a => a.classList.toggle('active', a.dataset.view === view));
   closeMenu();
   updateBreadcrumb(view);
-  if (!isRouting) {
-    if (view === 'library') { location.hash = 'protocols'; }
-    if (view === 'collections') { location.hash = 'collections'; }
-    if (view === 'about') { location.hash = 'about'; }
-    if (view === 'terms') { location.hash = 'terms'; }
-  }
-  if (view === 'library') loadProtocols();
-  if (view === 'collections') loadCollections();
+  if (view === 'library') { location.hash = 'library'; loadProtocols(); }
+  if (view === 'collections') { location.hash = 'collections'; loadCollections(); }
   if (view === 'create') { editingSlug = null; resetForm(); }
   if (view === 'create-collection') { editingCollectionSlug = null; resetCollectionForm(); }
-  if (view === 'about') updateAboutPage();
+  if (view === 'about') { location.hash = 'about'; }
   window.scrollTo(0, 0);
 }
 
@@ -823,12 +815,59 @@ async function showUser(username) {
           '<div class="info"><h3>' + escapeHtml(col.title) + '</h3><p>' + escapeHtml(col.description||'') + '</p></div></div>';
         }).join('') +
         '</div>' : '');
-    document.getElementById('detailActions').innerHTML = '';
+    // Add actions if viewing own profile
+    var actionsHtml = '';
+    if (currentUser && currentUser.username === username) {
+      actionsHtml = '<button class="btn" onclick="showChangePassword()">Change Password</button>';
+      if (currentUser.role === 'admin') {
+        actionsHtml += '<button class="btn primary" id="seedBtn" onclick="loadSeedProtocols()">Load Seed Protocols</button>';
+      }
+    }
+    document.getElementById('detailActions').innerHTML = actionsHtml;
   } catch (e) {
     document.getElementById('detailContent').innerHTML = '<div class="empty">User not found</div>';
   }
 }
 
+// --- Password change ---
+function showChangePassword() {
+  document.getElementById('pwModal').style.display = 'flex';
+}
+function closePwModal() { document.getElementById('pwModal').style.display = 'none'; }
+
+async function handleChangePassword(e) {
+  e.preventDefault();
+  var current = document.getElementById('pwCurrent').value;
+  var newPassword = document.getElementById('pwNew').value;
+  var confirmPw = document.getElementById('pwConfirm').value;
+  if (newPassword !== confirmPw) { toast('Passwords do not match', true); return; }
+  if (newPassword.length < 8) { toast('Password must be at least 8 characters', true); return; }
+  try {
+    await api('/auth/password', { method: 'POST', body: JSON.stringify({ current_password: current, new_password: newPassword }) });
+    toast('Password changed');
+    closePwModal();
+    document.getElementById('pwForm').reset();
+  } catch (err) {
+    toast(err.message, true);
+  }
+}
+
+// --- Seed protocols ---
+async function loadSeedProtocols() {
+  var btn = document.getElementById('seedBtn');
+  if (btn) { btn.disabled = true; btn.textContent = 'Loading...'; }
+  try {
+    var result = await api('/seed', { method: 'POST' });
+    toast('Loaded ' + result.imported + ' seed protocols');
+    if (btn) { btn.textContent = 'Load Seed Protocols'; btn.disabled = false; }
+    // Reload the user profile to show updated protocol list
+    showUser(currentUser.username);
+  } catch (e) {
+    toast(e.message, true);
+    if (btn) { btn.textContent = 'Load Seed Protocols'; btn.disabled = false; }
+  }
+}
+
 // --- Toast ---
 let toastTimer = null;
 function toast(msg, isError) {