feat: 工作目录支持页面内目录浏览器

frontend/src/App.css

@@ -767,6 +767,24 @@ code {
   color: var(--danger);
 }
 
+.field-with-action {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+}
+
+.field-with-action .field-input {
+  min-width: 0;
+  flex: 1;
+}
+
+.pick-directory-button {
+  flex-shrink: 0;
+  min-height: 38px;
+  padding: 8px 14px;
+  white-space: nowrap;
+}
+
 .env-detector-bar {
   display: flex;
   flex-wrap: wrap;
@@ -986,6 +1004,108 @@ code {
   margin-top: 24px;
 }
 
+.directory-picker {
+  display: flex;
+  width: min(760px, 100%);
+  flex-direction: column;
+}
+
+.directory-picker-toolbar {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  border-bottom: 1px solid var(--border);
+  padding: 14px 24px;
+}
+
+.directory-path-form {
+  display: flex;
+  min-width: 0;
+  flex: 1;
+}
+
+.directory-picker-body {
+  max-height: 46vh;
+  min-height: 220px;
+  flex: 1;
+  overflow-y: auto;
+  padding: 12px 16px 16px;
+}
+
+.directory-list {
+  display: flex;
+  margin: 0;
+  padding: 0;
+  flex-direction: column;
+  gap: 2px;
+  list-style: none;
+}
+
+.directory-row {
+  display: flex;
+  width: 100%;
+  align-items: center;
+  gap: 10px;
+  border: 0;
+  border-radius: 8px;
+  padding: 8px 10px;
+  background: transparent;
+  color: var(--text);
+  cursor: pointer;
+  font-size: 13px;
+  text-align: left;
+}
+
+.directory-row:hover {
+  background: var(--surface-muted);
+}
+
+.directory-row:focus-visible {
+  outline: 2px solid var(--primary);
+  outline-offset: 1px;
+}
+
+.directory-icon {
+  flex-shrink: 0;
+  font-size: 13px;
+}
+
+.directory-name {
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.directory-picker-footer {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 16px;
+  border-top: 1px solid var(--border);
+  padding: 14px 24px;
+  background: #fafafb;
+}
+
+.directory-picker-summary {
+  display: flex;
+  min-width: 0;
+  flex-direction: column;
+  gap: 4px;
+}
+
+.directory-picker-summary code {
+  overflow: hidden;
+  color: var(--text-secondary);
+  font-family: var(--font-mono);
+  font-size: 12px;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.directory-picker-actions {
+  margin-top: 0;
+}
+
 .drawer-overlay {
   align-items: center;
   justify-content: center;