fix: surface hash-duplicate warning and add manual refresh

Three issues fixed:

1. **Skipped-commit warning not visible** — When the user commits
   unchanged content (hash matches most recent version), the backend
   correctly returns {skipped: true, reason: "unchanged", message: ...}
   but the frontend Notification.warning was easy to miss (default
   4-5s autoClose, small toast at top-right). Now uses {autoClose: false}
   so the warning stays until manually dismissed, plus a console.log
   of the raw commit response for debugging. Added a fallback branch
   that warns clearly if the response shape is unexpected.

2. **No manual refresh on the panel** — In S3 setups the list call
   can occasionally lag the just-committed entry (manifest strong
   consistency is a per-implementation property). Added a "刷新"
   button at the top of the sidebar that calls model.refresh(), letting
   the user force a re-fetch when the auto-refresh misses.

3. **S3 addressing_style** — user-side config addition: S3Storage
   now uses path-style addressing (endpoint/bucket/key) which is the
   format required by MinIO and several other S3-compatible services.

Co-Authored-By: Claude <noreply@anthropic.com>

snapshot/storage/s3.py

@@ -82,7 +82,10 @@ class S3Storage(StorageAdapter):
             aws_access_key_id=access_key,
             aws_secret_access_key=secret_key,
             region_name="us-east-1",
-            config=BotoConfig(signature_version="s3v4"),
+            config=BotoConfig(
+                signature_version='s3v4',
+                s3={'addressing_style': 'path'},
+            ),
         )
         self._ClientError = ClientError
         self._connect_and_ensure_bucket()

src/commands.ts

@@ -64,12 +64,27 @@ export function registerCommands(
           name,
           description
         );
-        if (result.skipped) {
-          // Content hash matches the most recent version — nothing to save.
-          Notification.warning(result.message ?? '内容未变更，已跳过保存');
-        } else if (result.entry) {
+        // eslint-disable-next-line no-console
+        console.log('[snapshot] commit response:', result);
+        if (result && result.skipped) {
+          // Hash matched the most recent version — nothing to save. Use
+          // autoClose:false so the warning stays visible until the user
+          // dismisses it (the default 4-5s timeout is easy to miss).
+          Notification.warning(
+            result.message ?? '内容未变更，已跳过保存',
+            { autoClose: false }
+          );
+        } else if (result && result.entry) {
           await model.refresh();
           Notification.success(`已保存快照：${name}`);
+        } else {
+          // Unexpected response shape — surface clearly so the user is not
+          // left wondering whether the save happened.
+          // eslint-disable-next-line no-console
+          console.warn('[snapshot] unexpected commit response shape:', result);
+          Notification.warning('保存响应格式异常，请查看浏览器控制台', {
+            autoClose: false
+          });
         }
       } catch (e) {
         Notification.error(`保存快照失败：${(e as Error).message}`);

src/widgets/SnapshotPanel.tsx

@@ -46,18 +46,30 @@ const Panel: React.FC<PanelProps> = ({ model, app, tracker, serverSettings, onOp
   if (!model.path) {
     return <div className="jp-snapshot-panel-empty">未选中 notebook</div>;
   }
-  if (model.loading && model.versions.length === 0) {
-    return <div className="jp-snapshot-panel-empty">加载中…</div>;
-  }
-  if (model.versions.length === 0) {
   return (
+    <div className="jp-snapshot-panel-container">
+      <div className="jp-snapshot-panel-toolbar">
+        <button
+          className="jp-snapshot-panel-refresh-button"
+          onClick={() => {
+            void model.refresh();
+          }}
+          disabled={model.loading}
+          title="重新拉取版本列表"
+        >
+          {model.loading ? '刷新中…' : '刷新'}
+        </button>
+      </div>
+      {model.loading && model.versions.length === 0 ? (
+        <div className="jp-snapshot-panel-empty">加载中…</div>
+      ) : model.versions.length === 0 ? (
         <div className="jp-snapshot-panel-empty">
           <div>暂无快照</div>
-        <div className="jp-snapshot-panel-hint">点击工具栏「保存快照」按钮创建</div>
+          <div className="jp-snapshot-panel-hint">
+            点击工具栏「保存快照」按钮创建
           </div>
-    );
-  }
-  return (
+        </div>
+      ) : (
         <ul className="jp-snapshot-panel-list">
           {model.versions.map(v => (
             <li key={v.id} className="jp-snapshot-panel-item">
@@ -110,6 +122,8 @@ const Panel: React.FC<PanelProps> = ({ model, app, tracker, serverSettings, onOp
             </li>
           ))}
         </ul>
+      )}
+    </div>
   );
 };
 

style/base.css

@@ -13,6 +13,37 @@
   box-sizing: border-box;
 }
 
+.jp-snapshot-panel-container {
+  display: flex;
+  flex-direction: column;
+  height: 100%;
+}
+
+.jp-snapshot-panel-toolbar {
+  display: flex;
+  justify-content: flex-end;
+  margin-bottom: 6px;
+}
+
+.jp-snapshot-panel-refresh-button {
+  font-size: 0.8em;
+  padding: 2px 8px;
+  border: 1px solid var(--jp-border-color2, #ccc);
+  border-radius: 3px;
+  background: var(--jp-layout-color2, #f5f5f5);
+  color: var(--jp-ui-font-color1, #333);
+  cursor: pointer;
+}
+
+.jp-snapshot-panel-refresh-button:hover:not(:disabled) {
+  background: var(--jp-layout-color3, #e8e8e8);
+}
+
+.jp-snapshot-panel-refresh-button:disabled {
+  opacity: 0.6;
+  cursor: not-allowed;
+}
+
 .jp-snapshot-panel-empty {
   color: var(--jp-ui-font-color2, #555);
   padding: 12px;