新增: 文件浏览器收尾(滚动条/阶段进度条/空状态/骨架屏/工程下拉)

- 提交之前未提交的滚动条与布局修复
- 移除阶段进度条死代码(模板+CSS+常量)
- 文件预览空状态加图标引导
- 变更视图加载骨架屏
- 工程选择器改为自定义下拉(显示工程路径)

src/components/project/FileExplorer.vue

@@ -9,14 +9,24 @@
     <div class="explorer-toolbar">
       <div class="toolbar-left">
         <!-- 多工程下拉(单工程隐藏) -->
-        <select
-          v-if="modules.length > 1"
-          class="module-select"
-          :value="currentModuleId"
-          @change="onModuleChange"
-        >
-          <option v-for="m in modules" :key="m.id" :value="m.id">{{ m.name }}</option>
-        </select>
+        <div v-if="modules.length > 1" class="module-dropdown">
+          <button class="module-select" @click="moduleDropdownOpen = !moduleDropdownOpen">
+            <span class="module-select-name">{{ currentModule?.name ?? '...' }}</span>
+            <span class="module-select-arrow" :class="{ open: moduleDropdownOpen }">▾</span>
+          </button>
+          <div v-if="moduleDropdownOpen" class="module-dropdown-menu" @click.stop>
+            <div
+              v-for="m in modules"
+              :key="m.id"
+              class="module-dropdown-item"
+              :class="{ active: m.id === currentModuleId }"
+              @click="onModuleSelect(m.id)"
+            >
+              <span class="module-dropdown-name">{{ m.name }}</span>
+              <span v-if="m.path" class="module-dropdown-path" :title="m.path">{{ m.path }}</span>
+            </div>
+          </div>
+        </div>
 
         <!-- 路径面包屑 -->
         <nav class="breadcrumb">
@@ -160,6 +170,7 @@ const { t } = useI18n()
 const modules = ref<ProjectModuleRecord[]>([])
 const currentModuleId = ref<string>('')
 const refreshing = ref(false)
+const moduleDropdownOpen = ref(false)
 
 // 新增工程弹窗
 const showAddModule = ref(false)
@@ -216,10 +227,10 @@ function resetTreeState() {
   selectedFileGitStatus.value = undefined
 }
 
-/** 切换工程(下拉变更)。 */
-function onModuleChange(e: Event) {
-  const target = e.target as HTMLSelectElement
-  currentModuleId.value = target.value
+/** 自定义下拉选择工程。 */
+function onModuleSelect(id: string) {
+  currentModuleId.value = id
+  moduleDropdownOpen.value = false
   resetTreeState()
 }
 
@@ -310,6 +321,9 @@ function onChangeFileSelect(path: string) {
 
 watch(() => props.projectId, loadModules, { immediate: true })
 
+// 点击外部关闭工程下拉
+document.addEventListener('click', () => { moduleDropdownOpen.value = false })
+
 /** 提交新增工程。 */
 async function onAddModule() {
   if (addingModule.value) return
@@ -340,6 +354,7 @@ async function onAddModule() {
   display: flex;
   flex-direction: column;
   height: 100%;
+  max-height: 100%;
   background: var(--df-bg);
   border: 0.5px solid var(--df-border);
   border-radius: var(--df-radius-lg, 8px);
@@ -367,6 +382,9 @@ async function onAddModule() {
 }
 
 .module-select {
+  display: inline-flex;
+  align-items: center;
+  gap: 6px;
   padding: 5px 10px;
   background: var(--df-bg);
   border: 0.5px solid var(--df-border);
@@ -377,9 +395,54 @@ async function onAddModule() {
   max-width: 180px;
 }
 
-.module-select:focus {
-  outline: none;
-  border-color: var(--df-accent);
+.module-select:hover { border-color: var(--df-accent); }
+.module-select-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+.module-select-arrow {
+  font-size: 10px;
+  color: var(--df-text-dim);
+  transition: transform 0.15s;
+}
+.module-select-arrow.open { transform: rotate(180deg); }
+
+.module-dropdown { position: relative; flex-shrink: 0; }
+
+.module-dropdown-menu {
+  position: absolute;
+  top: calc(100% + 4px);
+  left: 0;
+  min-width: 220px;
+  max-width: 320px;
+  background: var(--df-bg-card);
+  border: 0.5px solid var(--df-border);
+  border-radius: var(--df-radius-sm, 4px);
+  box-shadow: 0 6px 16px rgba(0,0,0,0.25);
+  z-index: 20;
+  max-height: 280px;
+  overflow-y: auto;
+  scrollbar-width: thin;
+}
+
+.module-dropdown-item {
+  display: flex;
+  flex-direction: column;
+  gap: 2px;
+  padding: 8px 12px;
+  cursor: pointer;
+  border-bottom: 0.5px solid rgba(255,255,255,0.04);
+}
+.module-dropdown-item:last-child { border-bottom: none; }
+.module-dropdown-item:hover { background: rgba(255,255,255,0.04); }
+.module-dropdown-item.active {
+  background: rgba(255,255,255,0.06);
+  border-left: 2px solid var(--df-accent);
+}
+.module-dropdown-name { font-size: 12px; color: var(--df-text); }
+.module-dropdown-path {
+  font-size: 10px;
+  color: var(--df-text-dim);
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
 }
 
 /* 面包屑 */
@@ -458,6 +521,7 @@ async function onAddModule() {
   flex: 1;
   display: flex;
   overflow: hidden;
+  min-height: 0;
 }
 
 /* 左侧边栏(视图切换 + 内容) */
@@ -564,8 +628,8 @@ async function onAddModule() {
 .explorer-preview {
   flex: 1;
   min-width: 0;
+  min-height: 0;
   overflow: hidden;
-  scrollbar-width: thin;
 }
 
 .preview-placeholder-inline {

src/components/project/FilePreview.vue

@@ -35,7 +35,8 @@
     <div class="preview-body">
       <!-- 未选文件占位 -->
       <div v-if="!filePath" class="preview-placeholder">
-        {{ $t('fileExplorer.selectFileHint') }}
+        <div class="preview-placeholder-icon">📄</div>
+        <div class="preview-placeholder-text">{{ $t('fileExplorer.selectFileHint') }}</div>
       </div>
 
       <!-- 加载中 -->
@@ -75,9 +76,9 @@
       </div>
 
       <!-- 文本/代码(highlight.js 语法高亮 + 行号;非 diff 模式时显示) -->
-      <div v-else class="preview-code-wrap">
-        <div class="preview-line-numbers" ref="lineNumRef">
-          <div v-for="n in lineCount" :key="n" class="preview-line-num" :class="{ 'is-active': n === activeLine }">{{ n }}</div>
+      <div v-else class="preview-code-scroll">
+        <div class="preview-line-numbers" aria-hidden="true">
+          <div v-for="n in lineCount" :key="n" class="preview-line-num">{{ n }}</div>
         </div>
         <pre class="preview-code"><code :class="hljsClass" v-html="htmlContent"></code></pre>
       </div>
@@ -116,10 +117,6 @@ const lineCount = computed(() => {
   return lines.length
 })
 
-/** 当前激活行(预留:后续可点击行号跳转/选中高亮)。 */
-const activeLine = ref<number | null>(null)
-const lineNumRef = ref<HTMLElement | null>(null)
-
 /** Diff 显示控制 */
 const showDiff = ref(false)
 const diffContent = ref('')
@@ -398,6 +395,15 @@ onUnmounted(() => {
   min-height: 200px;
 }
 
+.preview-placeholder-icon {
+  font-size: 48px;
+  opacity: 0.4;
+}
+
+.preview-placeholder-text {
+  font-size: 13px;
+}
+
 .preview-error { color: #e05050; }
 .binary-icon { font-size: 32px; opacity: 0.5; }
 
@@ -423,24 +429,22 @@ onUnmounted(() => {
   font-size: 12.5px;
   line-height: 1.55;
   white-space: pre;
-  overflow: auto;
+  overflow: visible;
   tab-size: 2;
-  flex: 1;
   min-width: 0;
-  min-height: 0;
 }
 
 .preview-code code { font-family: inherit; }
 
-/* 行号 + 代码并排容器 */
-.preview-code-wrap {
+/* 行号 + 代码共享同一个滚动容器 */
+.preview-code-scroll {
   display: flex;
-  overflow: hidden;
+  flex: 1;
   min-height: 0;
-  flex: 1 1 0;
+  overflow: auto;
 }
 
-/* 行号列 */
+/* 行号列 — sticky 固定在左侧,跟随滚动容器一起滚 */
 .preview-line-numbers {
   flex-shrink: 0;
   padding: 14px 0;
@@ -449,13 +453,16 @@ onUnmounted(() => {
   background: rgba(255, 255, 255, 0.03);
   border-right: 0.5px solid var(--df-border);
   user-select: none;
-  overflow: hidden;
+  position: sticky;
+  left: 0;
+  z-index: 1;
+  align-self: flex-start;
 }
 
 .preview-line-num {
   padding: 0 10px 0 8px;
   font-family: var(--df-font-mono, 'Cascadia Code', Consolas, monospace);
-  font-size: 12px;
+  font-size: 12.5px;
   line-height: 1.55;
   color: var(--df-text-dim);
   opacity: 0.5;

src/components/project/GitChanges.vue

@@ -7,7 +7,9 @@
       <span v-if="!showHistory" class="branch-count">{{ gitStatus?.changed_files.length ?? 0 }} {{ $t('gitChanges.changedFiles') }}</span>
     </div>
 
-    <div v-if="loading && !gitStatus" class="gc-loading"><span class="spinner"></span></div>
+    <div v-if="loading && !gitStatus" class="gc-skeleton">
+      <div class="gc-skeleton-row" v-for="i in 6" :key="i"></div>
+    </div>
 
     <!-- 非 Git 仓库 -->
     <div v-else-if="gitStatus && !gitStatus.is_git_repo" class="gc-empty">
@@ -474,6 +476,25 @@ watch(() => props.moduleId, loadStatus, { immediate: true })
 }
 .gc-load-more:hover { background: rgba(255,255,255,0.04); }
 
+/* 骨架屏 */
+.gc-skeleton {
+  padding: 14px;
+  display: flex;
+  flex-direction: column;
+  gap: 10px;
+}
+.gc-skeleton-row {
+  height: 24px;
+  border-radius: 4px;
+  background: linear-gradient(90deg, rgba(255,255,255,0.04) 0%, rgba(255,255,255,0.08) 50%, rgba(255,255,255,0.04) 100%);
+  background-size: 200% 100%;
+  animation: gc-shimmer 1.5s infinite linear;
+}
+@keyframes gc-shimmer {
+  0% { background-position: 200% 0; }
+  100% { background-position: -200% 0; }
+}
+
 /* 通用 */
 .gc-loading, .gc-empty {
   display: flex; justify-content: center; align-items: center;