fix: Gitea sidebar tree + header actions inline with title

Gitea workspace sidebar:
- loadSidebarTree() now uses innerHTML replacement instead of DOM
  manipulation (avoids Alpine reactivity overwrites)
- Ensures workspace section is visible when tree loads
- Shows error message when Gitea API fails (no token/gateway)
- Better error handling with console.error catch

Header actions inline:
- page_editor: moved Edited/Share/Copy/Favorite/More buttons into
  the unified header (right_actions), accessible via window.E
  (editorState global reference set in init)
- Removed duplicate page-topbar div from content area
- Share dialog, More menu, and Activity popover stay in content
  area (triggered by header buttons via window.E references)
- Gitea workspace: header now uses page-action-btn for consistency

app/templates/page_editor.html

@@ -2,35 +2,11 @@
 page_title %}{{ page.title }}{% endblock %} {% block topbar %}
 {% set page_icon = "📄" %}
 {% set page_title = page.title %}
+{% set right_actions = '<span class="topbar-edited" style="cursor:pointer;" @click="window.E && (window.E.activityOpen = !window.E.activityOpen)">Edited <span x-text="window.E && window.E.timeAgo || \'\'"></span> ▾</span><button class="topbar-btn share-btn" @click="window.E && (window.E.shareOpen = !window.E.shareOpen)">🔒 Share ▾</button><button class="topbar-btn" @click="window.E && window.E.copyPageLink()" title="Copy link">🔗</button><button class="topbar-btn star-btn" @click="window.E && window.E.toggleFavorite()">⭐</button><button class="topbar-btn" @click="window.E && (window.E.moreOpen = !window.E.moreOpen)" style="position:relative">⋯</button>' %}
 {% include '_header.html' %}
 {% endblock %} {% block content %}
 <div class="page-editor-wrapper" x-data="editorState()">
-    <!-- ═══════════ Action Bar (Share, Copy, Favorite, More) ═══════════ -->
-    <div class="page-topbar">
-        <div class="page-topbar-right" style="position: relative">
-            <span class="topbar-edited" style="cursor:pointer;" @click="activityOpen = !activityOpen">Edited <span x-text="timeAgo"></span> ▾</span>
-            <button
-                class="page-action-btn share-btn"
-                @click="shareOpen = !shareOpen"
-            >
-                🔒 Share <span class="chevron-down">▾</span>
-            </button>
-            <button
-                class="page-action-btn"
-                @click="copyPageLink"
-                title="Copy link"
-            >
-                🔗
-            </button>
-            <button class="page-action-btn star-btn" @click="toggleFavorite">
-                <span
-                    x-text="favorited ? '⭐' : '☆'"
-                    :class="{ starred: favorited }"
-                ></span>
-            </button>
-            <button class="page-action-btn" @click="moreOpen = !moreOpen">
-                ⋮
-            </button>
+    <!-- Share/More dialogs (in content area, triggered by header buttons) -->
 
             <!-- ═══════════ Share / Publish Dialog ═══════════ -->
             <div
@@ -410,8 +386,6 @@ page_title %}{{ page.title }}{% endblock %} {% block topbar %}
                     </div>
                 </div>
             </div>
-        </div>
-    </div>
 
     <!-- ═══════════ Page Content ═══════════ -->
     <div class="page-cover-area">