feat: sidebar arborescence Gitea + tab user repos avec vrai username

1. Tab user repos: fetch username via /auth/user → affiche 'bruno' au lieu de 'Personal'
2. Sidebar: ws_cookie='gitea:owner:repo' → _sidebar_data() fetch le tree depuis Gitea API
3. base.html: data-gitea-path/type/sha sur les items workspace pour les projets Gitea
4. gitea_workspace.html: refonte sans tree panel → navigation via sidebar
   - Clic fichier → ouvre dans le contenu (lecture + edit + commit)
   - Clic dossier → lazy-load les enfants dans le sidebar
5. openGitea(): set cookie flowdeck_workspace avant navigation

app/templates/workspaces.html

@@ -285,6 +285,17 @@ function workspacesPage() {
         // Fetch repos: user repos + org repos
         const groups = [];
 
+        // Get username for the "personal" tab
+        let myLogin = 'Me';
+        try {
+          const meRes = await fetch('/auth/user');
+          if (meRes.ok) {
+            const meData = await meRes.json();
+            myLogin = meData.user?.login || 'Me';
+            if (myLogin.includes('_')) myLogin = myLogin.split('_').pop(); // strip gitea_ prefix if present
+          }
+        } catch(e) {}
+
         // User repos (no org filter)
         try {
           const userRes = await fetch('/api/gitea/projects');
@@ -292,7 +303,7 @@ function workspacesPage() {
             const d = await userRes.json();
             const repos = d.projects || [];
             if (repos.length) {
-              groups.push({org: 'Personal', avatar: '', projects: repos.map(r => ({...r, owner: r.owner || {login: '~'}}))});
+              groups.push({org: myLogin, avatar: '', projects: repos.map(r => ({...r, owner: r.owner || {login: myLogin}}))});
             }
           }
         } catch(e) {}
@@ -322,6 +333,8 @@ function workspacesPage() {
       const owner = proj.owner?.login || proj.owner?.username || proj.full_name?.split('/')[0] || '';
       const repo = proj.name;
       if (owner && repo) {
+        // Set workspace cookie so sidebar shows tree
+        document.cookie = 'flowdeck_workspace=gitea:' + owner + ':' + repo + ';path=/;SameSite=Lax';
         window.location = `/gitea-workspace?owner=${encodeURIComponent(owner)}&repo=${encodeURIComponent(repo)}`;
       }
     }