DECK Frontend v4.4 - Tree from tree_* relational tables

- Added API.getTree() to query tree_{base} tables
- TreeView now builds real 1:N hierarchy from tree_* data
- Recursive rendering with proper parent-child relationships
- Library filter still works (filters tags before building tree)
- Updated CSS for hierarchical tree display with depth indicators

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

deck-frontend/deck-v4.4.html

@@ -7,13 +7,13 @@
   <meta name="description" content="DECK Tag Management System">
 
 <!--
-  DECK FRONTEND v4.3 - Portable single-file
+  DECK FRONTEND v4.4 - Tree from tree_* tables
   Extract: ./extract.sh deck.html [output_dir]
 -->
 
 <style>
 /* =============================================================================
- * DECK STYLES v4.3
+ * DECK STYLES v4.4
  * ============================================================================= */
 
 /* -----------------------------------------------------------------------------
@@ -444,31 +444,21 @@ body {
 }
 
 /* Tree View */
-.content-area--tree { display: flex; flex-direction: column; gap: 8px; }
-.tree-group { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: var(--border-radius-lg); overflow: hidden; }
+.content-area--tree { display: flex; flex-direction: column; gap: 2px; }
+.tree-node { border-left: 1px solid var(--border-color); margin-left: 10px; }
+.tree-node[data-depth="0"] { border-left: none; margin-left: 0; }
+.tree-children { display: none; }
+.tree-children--expanded { display: block; }
 
-.tree-header {
-  padding: 12px 16px;
-  display: flex;
-  align-items: center;
-  gap: 10px;
-  cursor: pointer;
-  transition: background var(--transition-fast);
-}
-
-.tree-header:hover { background: var(--bg-hover); }
-.tree-header:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }
-.tree-toggle { width: 20px; font-weight: bold; color: var(--accent); text-align: center; user-select: none; }
-.tree-group-name { flex: 1; font-weight: 500; }
-.tree-count { color: var(--text-muted); font-size: 0.85em; }
-.tree-items { display: none; padding: 0 16px 12px; flex-direction: column; gap: 4px; }
-.tree-items--expanded { display: flex; }
+.tree-toggle { width: 20px; font-weight: bold; color: var(--accent); text-align: center; user-select: none; cursor: pointer; flex-shrink: 0; }
+.tree-toggle--empty { visibility: hidden; }
+.tree-count { color: var(--text-muted); font-size: 0.75em; margin-left: auto; }
 
 .tree-item {
   display: flex;
   align-items: center;
-  gap: 10px;
-  padding: 8px 12px;
+  gap: 8px;
+  padding: 6px 12px;
   border-radius: var(--border-radius-md);
   cursor: pointer;
   transition: background var(--transition-fast);
@@ -476,23 +466,24 @@ body {
 
 .tree-item:hover { background: var(--bg-hover); }
 .tree-item:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }
-.tree-item__img { width: 32px; height: 32px; object-fit: cover; border-radius: var(--border-radius-sm); flex-shrink: 0; }
+.tree-item--parent .tree-toggle:hover { color: var(--accent-hover); }
+.tree-item__img { width: 28px; height: 28px; object-fit: cover; border-radius: var(--border-radius-sm); flex-shrink: 0; }
 
 .tree-item__placeholder {
-  width: 32px;
-  height: 32px;
+  width: 28px;
+  height: 28px;
   background: var(--bg-hover);
   border-radius: var(--border-radius-sm);
   display: flex;
   align-items: center;
   justify-content: center;
   font-weight: 600;
-  font-size: 0.8em;
+  font-size: 0.75em;
   color: var(--accent);
   flex-shrink: 0;
 }
 
-.tree-item__name { flex: 1; font-size: 0.9em; }
+.tree-item__name { font-size: 0.85em; }
 
 /* Graph View */
 .content-area--graph { position: relative; padding: 0; overflow: hidden; }
@@ -730,8 +721,8 @@ body {
 
 <script>
 /**
- * DECK Frontend v4.3
- * Portable single-file with trivial extraction
+ * DECK Frontend v4.4
+ * Tree view from tree_* relational tables
  */
 
 // =============================================================================
@@ -782,7 +773,7 @@ const State = {
     base: "hst", view: "grid", lang: "es",
     search: "", group: "all", library: "all", libraryMembers: new Set(),
     selectionMode: false, selected: new Set(), selectedTag: null,
-    tags: [], hstTags: [], groups: [], libraries: [], edges: [],
+    tags: [], hstTags: [], groups: [], libraries: [], edges: [], treeData: [],
     graphFilters: { categories: new Set(Object.keys(CONFIG.CATEGORIES)), edgeTypes: new Set(Object.keys(CONFIG.EDGE_TYPES)) },
     graphSettings: { ...CONFIG.GRAPH_DEFAULTS }
   },
@@ -922,6 +913,12 @@ const API = {
     return this.fetch(`/graph_${base}`, config.schema, { fallback: [] });
   },
 
+  getTree(base) {
+    const config = CONFIG.BASES[base];
+    if (!config) return Promise.resolve([]);
+    return this.fetch(`/tree_${base}`, config.schema, { fallback: [] });
+  },
+
   getChildren(mrf, base) {
     const config = CONFIG.BASES[base];
     if (!config) return Promise.resolve([]);
@@ -1125,53 +1122,74 @@ const TreeView = {
 
     if (!tags.length) { area.innerHTML = '<div class="empty">Sin resultados</div>'; return; }
 
-    const { lang, hstTags } = State.get();
-    const grouped = {};
-    tags.forEach(tag => {
-      const key = tag.set_hst || "_ungrouped";
-      if (!grouped[key]) grouped[key] = [];
-      grouped[key].push(tag);
+    const { lang, treeData } = State.get();
+
+    // Create tag lookup map
+    const tagMap = new Map();
+    tags.forEach(tag => tagMap.set(tag.mrf, tag));
+
+    // Create children map from tree_* data
+    const childrenMap = new Map(); // parent_mrf → [child_mrfs]
+    const hasParent = new Set();   // mrfs that have a parent
+
+    treeData.forEach(rel => {
+      if (tagMap.has(rel.mrf_child)) { // Only if child is in filtered tags
+        if (!childrenMap.has(rel.mrf_parent)) childrenMap.set(rel.mrf_parent, []);
+        childrenMap.get(rel.mrf_parent).push(rel.mrf_child);
+        hasParent.add(rel.mrf_child);
+      }
     });
 
-    const groupNames = {};
-    hstTags.forEach(h => { groupNames[h.mrf] = Utils.getName(h, lang); });
+    // Find root nodes: tags that don't have a parent (or parent not in tagMap)
+    const roots = tags.filter(tag => !hasParent.has(tag.mrf));
+
+    // Recursive render function
+    const renderNode = (mrf, depth = 0) => {
+      const tag = tagMap.get(mrf);
+      if (!tag) return "";
 
-    area.innerHTML = Object.entries(grouped).map(([key, items]) => {
-      const groupName = Utils.escapeHtml(groupNames[key] || key);
-      return `
-        <div class="tree-group">
-          <div class="tree-header" tabindex="0" role="button" aria-expanded="false">
-            <span class="tree-toggle" aria-hidden="true">+</span>
-            <span class="tree-group-name">${groupName}</span>
-            <span class="tree-count">${items.length}</span>
-          </div>
-          <div class="tree-items" role="group">
-            ${items.map(tag => {
       const name = Utils.escapeHtml(Utils.getName(tag, lang));
       const img = Utils.resolveImage(tag.img_thumb_url);
       const ref = Utils.escapeHtml(tag.ref || "");
-              const mrf = Utils.escapeHtml(tag.mrf);
+      const safeMrf = Utils.escapeHtml(mrf);
+      const children = childrenMap.get(mrf) || [];
+      const hasChildren = children.length > 0;
+
       return `
-                <div class="tree-item" data-mrf="${mrf}" tabindex="0" role="button">
+        <div class="tree-node" data-depth="${depth}">
+          <div class="tree-item ${hasChildren ? 'tree-item--parent' : ''}" data-mrf="${safeMrf}" tabindex="0" role="button" style="padding-left: ${12 + depth * 20}px">
+            ${hasChildren ? '<span class="tree-toggle" aria-hidden="true">+</span>' : '<span class="tree-toggle tree-toggle--empty"></span>'}
             ${img ? `<img class="tree-item__img" src="${img}" alt="${name}">` : `<div class="tree-item__placeholder">${ref.slice(0, 1) || "?"}</div>`}
             <span class="tree-item__name">${name}</span>
+            ${hasChildren ? `<span class="tree-count">${children.length}</span>` : ''}
+          </div>
+          ${hasChildren ? `<div class="tree-children" role="group">${children.map(c => renderNode(c, depth + 1)).join("")}</div>` : ''}
         </div>
       `;
-            }).join("")}
-          </div>
-        </div>
-      `;
-    }).join("");
+    };
 
-    area.querySelectorAll(".tree-header").forEach(header => {
-      header.onclick = header.onkeydown = (e) => {
+    if (!roots.length) {
+      area.innerHTML = '<div class="empty">Sin jerarquía definida</div>';
+      return;
+    }
+
+    area.innerHTML = roots.map(tag => renderNode(tag.mrf, 0)).join("");
+
+    // Bind toggle events
+    area.querySelectorAll(".tree-item--parent").forEach(item => {
+      const toggle = item.querySelector(".tree-toggle");
+      const children = item.nextElementSibling;
+
+      item.onclick = item.onkeydown = (e) => {
+        // Don't toggle if clicking to select (will be handled by content-area click)
+        if (e.target.closest(".tree-item__img, .tree-item__name, .tree-item__placeholder")) return;
         if (e.type === "keydown" && e.key !== "Enter" && e.key !== " ") return;
         if (e.type === "keydown") e.preventDefault();
-        const items = header.nextElementSibling;
-        const toggle = header.querySelector(".tree-toggle");
-        const isExpanded = items.classList.toggle("tree-items--expanded");
+
+        if (children) {
+          const isExpanded = children.classList.toggle("tree-children--expanded");
           toggle.textContent = isExpanded ? "−" : "+";
-        header.setAttribute("aria-expanded", isExpanded);
+        }
       };
     });
   }
@@ -1494,10 +1512,10 @@ const App = {
   async loadData(base) {
     Utils.$("#content-area").innerHTML = '<div class="loading">Cargando...</div>';
     try {
-      const [tags, hstTags, groups, libraries, edges] = await Promise.all([
-        API.getTags(base), API.getHstTags(), API.getGroups(), API.getLibraries(base), API.getEdges(base)
+      const [tags, hstTags, groups, libraries, edges, treeData] = await Promise.all([
+        API.getTags(base), API.getHstTags(), API.getGroups(), API.getLibraries(base), API.getEdges(base), API.getTree(base)
       ]);
-      State.set({ tags, hstTags, groups, libraries, edges });
+      State.set({ tags, hstTags, groups, libraries, edges, treeData });
       GroupsBar.render();
       LibrariesPanel.render();
     } catch (error) {