refactor: remove Agent preset system, fix run_command enable bug

- Delete preset-manager.ts and preset-bar.ts
- Clean up all preset references from main.ts, types.d.ts, state.ts
- Remove preset modal HTML and CSS, rename temp-slider/modal-actions classes
- Fix run_command tool not being enabled (missing setToolEnabled call)

src/renderer/index.html

@@ -190,7 +190,7 @@
                 </div>
                 <p class="text-muted" style="margin-top:4px;font-size:11px;">常见值：2048 / 4096 / 8192 / 32768。值越大上下文越长，显存占用越高。</p>
                 <label class="setting-label" style="margin-top:12px;">温度（Temperature）：<span id="tempValue">0.7</span></label>
-                <input type="range" id="inputTemperature" class="preset-temp-slider" min="0" max="2" step="0.1" value="0.7">
+                <input type="range" id="inputTemperature" class="temp-slider" min="0" max="2" step="0.1" value="0.7">
                 <p class="text-muted" style="margin-top:4px;font-size:11px;">低值更精确稳定，高值更有创意多样（0 = 确定性，2 = 最大随机）</p>
             </div>
             <div class="setting-group">
@@ -356,57 +356,7 @@
     </div>
 </div>
 
-<!-- ═══════════════ 预设管理模态框 ═══════════════ -->
-<div class="modal-overlay" id="presetModal" style="display:none;">
-    <div class="modal">
-        <div class="modal-header">
-            <h3 id="presetModalTitle">✨ 新建预设</h3>
-            <button class="icon-btn" id="btnClosePresetModal">
-                <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
-                    <line x1="18" y1="6" x2="6" y2="18"/><line x1="6" y1="6" x2="18" y2="18"/>
-                </svg>
-            </button>
-        </div>
-        <div class="modal-body">
-            <div class="setting-group">
-                <label class="setting-label">名称</label>
-                <div class="preset-name-row">
-                    <input class="setting-input preset-icon-input" id="inputPresetIcon" type="text" maxlength="4" placeholder="🤖">
-                    <input class="setting-input" id="inputPresetName" type="text" placeholder="例如：翻译官" style="flex:1;">
-                </div>
-            </div>
-            <div class="setting-group">
-                <label class="setting-label">系统提示词（System Prompt）</label>
-                <textarea class="setting-input" id="inputPresetSystemPrompt" rows="6" placeholder="定义这个角色的行为、能力和回答风格..." style="resize:vertical;min-height:120px;"></textarea>
-            </div>
-            <div class="setting-group">
-                <label class="setting-label">温度（Temperature）：<span id="presetTempValue">0.7</span></label>
-                <input type="range" id="inputPresetTemp" class="preset-temp-slider" min="0" max="2" step="0.1" value="0.7">
-            </div>
-            <div class="setting-group">
-                <label class="setting-label">上下文长度（num_ctx）</label>
-                <div style="display:flex;gap:8px;align-items:center;">
-                    <input class="setting-input" id="inputPresetNumCtx" type="number" min="512" max="131072" step="512" value="24576" style="margin-bottom:0;">
-                    <span class="text-muted" style="white-space:nowrap;">tokens</span>
-                </div>
-            </div>
-            <div class="setting-group">
-                <label class="setting-label">Think 深度推理</label>
-                <label class="toggle-label" style="display:inline-flex;align-items:center;gap:8px;">
-                    <input type="checkbox" id="togglePresetThink">
-                    <span class="toggle-slider"></span>
-                    <span class="text-muted" style="font-size:12px;">需要模型支持</span>
-                </label>
-            </div>
-            <div class="preset-modal-actions">
-                <button class="btn btn-danger" id="btnDeletePreset" style="display:none;">🗑️ 删除</button>
-                <div style="flex:1;"></div>
-                <button class="btn btn-outline" id="btnClosePresetModal2" onclick="document.querySelector('#presetModal').style.display='none';">取消</button>
-                <button class="btn btn-primary" id="btnSavePreset">创建</button>
-            </div>
-        </div>
-    </div>
-</div>
+
 
 <!-- ═══════════════ 图片预览 Lightbox ═══════════════ -->
 <div class="lightbox-overlay" id="lightbox" style="display:none;">
@@ -423,7 +373,7 @@
         <div class="modal-body" id="toolConfirmBody">
             <p>AI 请求执行一个需要确认的操作。</p>
         </div>
-        <div class="preset-modal-actions" style="padding:12px 20px 16px;">
+        <div class="modal-actions" style="padding:12px 20px 16px;">
             <div style="flex:1;"></div>
             <button class="btn btn-outline" id="toolCancelBtn">❌ 取消</button>
             <button class="btn btn-primary" id="toolConfirmBtn">✅ 确认执行</button>