feat(sidebar): 统一Git和终端侧边栏空状态样式

- Git空状态改为图标+大字，与终端风格一致
- 终端空状态去掉小字，文字改为当前没有开启的终端
- 统一头部栏高度为38px
- 统一空状态图标颜色为var(--text-tertiary) + 整体opacity
- 统一空tab文字为13px/600字重/左对齐
- 新增folder-git-2.svg图标

static/icons/folder-git-2.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" width="24" height="24" fill="none" stroke="#000000" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" style="opacity:1;"><path d="M9 20H4a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h3.9a2 2 0 0 1 1.69.9l.81 1.2a2 2 0 0 0 1.67.9H20a2 2 0 0 1 2 2v5"/><circle cx="13" cy="12" r="2"/><path d="M18 19c-2.8 0-5-2.2-5-5v8"/><circle cx="20" cy="19" r="2"/></svg>

static/src/components/panels/GitChangesPanel.vue

@@ -18,7 +18,15 @@
     <div class="git-changes-panel__body">
       <div v-if="loading && !diff" class="git-changes-panel__empty">正在加载 Git 变更…</div>
       <div v-else-if="error && !files.length" class="git-changes-panel__empty git-changes-panel__empty--error">{{ error }}</div>
-      <div v-else-if="!files.length" class="git-changes-panel__empty">当前没有未提交变更</div>
+      <div v-else-if="!files.length" class="git-changes-panel__empty">
+        <svg class="git-changes-panel__empty-svg" viewBox="0 0 24 24" fill="none" aria-hidden="true">
+          <path d="M9 20H4a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h3.9a2 2 0 0 1 1.69.9l.81 1.2a2 2 0 0 0 1.67.9H20a2 2 0 0 1 2 2v5" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
+          <circle cx="13" cy="12" r="2" stroke="currentColor" stroke-width="2"/>
+          <path d="M18 19c-2.8 0-5-2.2-5-5v8" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
+          <circle cx="20" cy="19" r="2" stroke="currentColor" stroke-width="2"/>
+        </svg>
+        <span>当前没有未提交变更</span>
+      </div>
       <section v-for="file in files" v-else :key="file.path" class="git-change-file">
         <div class="git-change-file__header">
           <span class="git-change-file__title">

static/src/components/panels/TerminalPanel.vue

@@ -33,8 +33,7 @@
           <rect x="2" y="3" width="20" height="16" rx="2" stroke="currentColor" stroke-width="1.5"/>
           <path d="M6 7h12M6 10h8" stroke="currentColor" stroke-width="1.5" stroke-linecap="round"/>
         </svg>
-        <span>暂无活动终端</span>
-        <span class="terminal-panel__idle-hint">AI 使用终端时将自动显示</span>
+        <span>当前没有开启的终端</span>
       </div>
     </div>
   </aside>
@@ -466,9 +465,9 @@ onBeforeUnmount(() => {
 .terminal-panel__empty-tab {
   display: flex;
   align-items: center;
-  padding: 4px 10px;
-  font-size: 12px;
-  color: var(--text-muted);
+  font-size: 13px;
+  font-weight: 600;
+  color: var(--text-primary);
 }
 
 .terminal-panel__tab {
@@ -552,11 +551,7 @@ onBeforeUnmount(() => {
 .terminal-panel__idle-svg {
   width: 36px;
   height: 36px;
-  opacity: 0.35;
-}
-
-.terminal-panel__idle-hint {
-  font-size: 11px;
+  color: var(--text-tertiary);
   opacity: 0.55;
 }
 

static/src/styles/components/panels/_right-panel.scss

@@ -77,8 +77,8 @@
 
 .git-changes-panel__header {
     flex: 0 0 auto;
-    min-height: 54px;
-    padding: 10px 14px 8px 16px;
+    min-height: 38px;
+    padding: 0 8px;
     display: flex;
     align-items: center;
     justify-content: space-between;
@@ -182,10 +182,21 @@
 }
 
 .git-changes-panel__empty {
-    padding: 48px 12px;
-    color: var(--claude-text-secondary);
-    text-align: center;
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    justify-content: center;
+    height: 100%;
+    gap: 8px;
+    color: var(--text-muted);
     font-size: 13px;
+
+    &-svg {
+        width: 36px;
+        height: 36px;
+        color: var(--text-tertiary);
+        opacity: 0.55;
+    }
 }
 
 .git-changes-panel__empty--error {