feat: optimize file content resolution and enhance loading state handling

- Added a fast path in FileContentResolver to skip history lookup for files created by the agent with empty original content.
- Improved loading state in FileSectionDiff to display a loading message and snippet preview when applicable.
- Adjusted header content class names in ClaudeLogsSection and button styles in CollapsibleTeamSection for better UI consistency.
- Refactored ContinuousScrollView to streamline rendering logic for file sections based on content availability.

src/main/services/team/FileContentResolver.ts

@@ -74,6 +74,19 @@ export class FileContentResolver {
       logger.debug(`Файл недоступен на диске: ${filePath}`);
     }
 
+    // Fast path: if the agent created the file and it still exists on disk,
+    // the original content is definitely empty, so skip expensive history lookup.
+    const hasWriteNew = snippets.some((s) => !s.isError && s.type === 'write-new');
+    if (hasWriteNew && currentContent !== null) {
+      const result = {
+        original: '',
+        modified: currentContent,
+        source: 'snippet-reconstruction' as const,
+      };
+      this.cacheResult(cacheKey, result);
+      return result;
+    }
+
     // Strategy 1: Try file-history backup
     const historyResult = await this.tryFileHistoryBackup(teamName, memberName, filePath);
     if (historyResult) {

src/renderer/components/team/ClaudeLogsSection.tsx

@@ -123,7 +123,7 @@ export const ClaudeLogsSection = ({
             </Tooltip>
           ) : undefined
         }
-        headerContentClassName={isSidebar ? 'flex-wrap items-center gap-y-1 py-1 pr-3' : 'pr-3'}
+        headerContentClassName={isSidebar ? 'flex-wrap items-center gap-y-1 py-1 pr-1' : 'pr-1'}
         headerExtra={sectionHeaderExtra}
         defaultOpen={false}
         contentClassName="pt-0 [overflow-anchor:none]"

src/renderer/components/team/CollapsibleTeamSection.tsx

@@ -85,7 +85,7 @@ export const CollapsibleTeamSection = ({
       >
         <button
           type="button"
-          className={`absolute inset-0 z-0 cursor-pointer transition-colors ${isOpen ? 'rounded-t-md bg-[var(--color-section-bg-open)] hover:bg-[var(--color-section-hover-open)]' : 'rounded-md bg-[var(--color-section-bg)] hover:bg-[var(--color-section-hover)]'}`}
+          className={`absolute inset-0 z-0 cursor-pointer transition-colors ${isOpen ? 'rounded-t-xl bg-[var(--color-section-bg-open)] hover:bg-[var(--color-section-hover-open)]' : 'rounded-xl bg-[var(--color-section-bg)] hover:bg-[var(--color-section-hover)]'}`}
           onClick={() =>
             setOpen((prev) => {
               const next = !prev;

src/renderer/components/team/review/ContinuousScrollView.tsx

@@ -12,7 +12,6 @@ import {
 } from './CodeMirrorDiffUtils';
 import { FileSectionDiff } from './FileSectionDiff';
 import { FileSectionHeader } from './FileSectionHeader';
-import { FileSectionPlaceholder } from './FileSectionPlaceholder';
 
 import type { EditorView } from '@codemirror/view';
 import type { FileChangeWithContent, HunkDecision } from '@shared/types';
@@ -256,28 +255,25 @@ export const ContinuousScrollView = ({
               onRestoreMissingFile={onRestoreMissingFile}
             />
 
-            {!isCollapsed &&
-              (hasContent ? (
-                <FileSectionDiff
-                  file={file}
-                  fileContent={content}
-                  isLoading={false}
-                  collapseUnchanged={collapseUnchanged}
-                  onHunkAccepted={onHunkAccepted}
-                  onHunkRejected={onHunkRejected}
-                  onFullyViewed={onFullyViewed}
-                  onContentChanged={onContentChanged}
-                  onEditorViewReady={handleEditorViewReady}
-                  discardCounter={discardCounters[filePath] ?? 0}
-                  autoViewed={autoViewed}
-                  isViewed={isViewed}
-                  onSelectionChange={onSelectionChange}
-                  globalHunkOffset={globalHunkOffsets?.[filePath] ?? 0}
-                  totalReviewHunks={totalReviewHunks}
-                />
-              ) : (
-                <FileSectionPlaceholder fileName={file.relativePath} />
-              ))}
+            {!isCollapsed && (
+              <FileSectionDiff
+                file={file}
+                fileContent={content}
+                isLoading={!hasContent}
+                collapseUnchanged={collapseUnchanged}
+                onHunkAccepted={onHunkAccepted}
+                onHunkRejected={onHunkRejected}
+                onFullyViewed={onFullyViewed}
+                onContentChanged={onContentChanged}
+                onEditorViewReady={handleEditorViewReady}
+                discardCounter={discardCounters[filePath] ?? 0}
+                autoViewed={autoViewed}
+                isViewed={isViewed}
+                onSelectionChange={onSelectionChange}
+                globalHunkOffset={globalHunkOffsets?.[filePath] ?? 0}
+                totalReviewHunks={totalReviewHunks}
+              />
+            )}
           </div>
         );
       })}

src/renderer/components/team/review/FileSectionDiff.tsx

@@ -80,7 +80,20 @@ export const FileSectionDiff = ({
 
   // Loading state
   if (isLoading) {
-    return <FileSectionPlaceholder fileName={file.relativePath} />;
+    const hasSnippetPreview = file.snippets.some((snippet) => !snippet.isError);
+    if (!hasSnippetPreview) {
+      return <FileSectionPlaceholder fileName={file.relativePath} />;
+    }
+
+    return (
+      <div className="overflow-auto">
+        <div className="bg-surface-raised/40 border-b border-border px-4 py-2 text-xs text-text-muted">
+          Loading full diff...
+        </div>
+        <ReviewDiffContent file={file} />
+        <div ref={sentinelRef} className="h-1 shrink-0" />
+      </div>
+    );
   }
 
   // Resolve modified content: prefer full content, fall back to write-type snippet