style: hide agent config panel by default and add edit toggle button

src/sidebarProvider.ts

@@ -999,6 +999,7 @@ export class SidebarChatProvider implements vscode.WebviewViewProvider, BridgeIn
             <select id="modelSel" title="Select Model"></select>
             <select id="brainSel" title="Select Brain"></select>
             <select id="agentSel" title="Select Agentic Skill"></select>
+            <button class="icon-btn" id="editAgentBtn" title="Edit Agent Skill">📝</button>
             <button class="icon-btn" id="addAgentBtn" title="Create Agent">+</button>
             <button class="icon-btn" id="internetBtn" title="Internet Access">🌐</button>
             <button class="icon-btn" id="brainBtn" title="Sync Knowledge">🧠</button>
@@ -1064,6 +1065,7 @@ export class SidebarChatProvider implements vscode.WebviewViewProvider, BridgeIn
         const fileInput = document.getElementById('fileInput');
         const attachPreview = document.getElementById('attachPreview');
         const agentSel = document.getElementById('agentSel');
+        const editAgentBtn = document.getElementById('editAgentBtn');
         const addAgentBtn = document.getElementById('addAgentBtn');
         const agentConfigPanel = document.getElementById('agentConfigPanel');
         const agentPrompt = document.getElementById('agentPrompt');
@@ -1073,6 +1075,7 @@ export class SidebarChatProvider implements vscode.WebviewViewProvider, BridgeIn
         let streamBody = null;
         let internetEnabled = false;
         let pendingFiles = [];
+        let editMode = false;
 
         function fmt(text) { return marked.parse(text || ''); }
 
@@ -1277,15 +1280,24 @@ export class SidebarChatProvider implements vscode.WebviewViewProvider, BridgeIn
 
         agentSel.onchange = () => {
             if (agentSel.value !== 'none') {
-                agentConfigPanel.style.display = 'flex';
                 vscode.postMessage({ type: 'getAgentContent', path: agentSel.value });
+                if (editMode) agentConfigPanel.style.display = 'flex';
             } else {
                 agentConfigPanel.style.display = 'none';
+                editMode = false;
+                editAgentBtn.classList.remove('active');
                 agentPrompt.value = '';
                 negativePrompt.value = '';
             }
         };
 
+        editAgentBtn.onclick = () => {
+            if (agentSel.value === 'none') return;
+            editMode = !editMode;
+            editAgentBtn.classList.toggle('active', editMode);
+            agentConfigPanel.style.display = editMode ? 'flex' : 'none';
+        };
+
         updateAgentBtn.onclick = () => {
             if (agentSel.value !== 'none') {
                 vscode.postMessage({