feat(sessions): add API endpoints for hiding and unhiding sessions

- Implemented new POST endpoints for hiding and unhiding individual and bulk sessions in the configuration.
- Added error handling and validation for project and session IDs in the new API routes.
- Enhanced the existing session management functionality in the ConfigManager to support these operations.

src/main/http/config.ts

@@ -382,6 +382,94 @@ export function registerConfigRoutes(app: FastifyInstance): void {
     }
   );
 
+  // Hide session
+  app.post<{ Body: { projectId: string; sessionId: string } }>(
+    '/api/config/hide-session',
+    async (request) => {
+      try {
+        const { projectId, sessionId } = request.body;
+        if (!projectId || typeof projectId !== 'string') {
+          return { success: false, error: 'Project ID is required and must be a string' };
+        }
+        if (!sessionId || typeof sessionId !== 'string') {
+          return { success: false, error: 'Session ID is required and must be a string' };
+        }
+
+        configManager.hideSession(projectId, sessionId);
+        return { success: true };
+      } catch (error) {
+        logger.error('Error in POST /api/config/hide-session:', error);
+        return { success: false, error: getErrorMessage(error) };
+      }
+    }
+  );
+
+  // Unhide session
+  app.post<{ Body: { projectId: string; sessionId: string } }>(
+    '/api/config/unhide-session',
+    async (request) => {
+      try {
+        const { projectId, sessionId } = request.body;
+        if (!projectId || typeof projectId !== 'string') {
+          return { success: false, error: 'Project ID is required and must be a string' };
+        }
+        if (!sessionId || typeof sessionId !== 'string') {
+          return { success: false, error: 'Session ID is required and must be a string' };
+        }
+
+        configManager.unhideSession(projectId, sessionId);
+        return { success: true };
+      } catch (error) {
+        logger.error('Error in POST /api/config/unhide-session:', error);
+        return { success: false, error: getErrorMessage(error) };
+      }
+    }
+  );
+
+  // Bulk hide sessions
+  app.post<{ Body: { projectId: string; sessionIds: string[] } }>(
+    '/api/config/hide-sessions',
+    async (request) => {
+      try {
+        const { projectId, sessionIds } = request.body;
+        if (!projectId || typeof projectId !== 'string') {
+          return { success: false, error: 'Project ID is required and must be a string' };
+        }
+        if (!Array.isArray(sessionIds) || sessionIds.some((id) => typeof id !== 'string')) {
+          return { success: false, error: 'Session IDs must be an array of strings' };
+        }
+
+        configManager.hideSessions(projectId, sessionIds);
+        return { success: true };
+      } catch (error) {
+        logger.error('Error in POST /api/config/hide-sessions:', error);
+        return { success: false, error: getErrorMessage(error) };
+      }
+    }
+  );
+
+  // Bulk unhide sessions
+  app.post<{ Body: { projectId: string; sessionIds: string[] } }>(
+    '/api/config/unhide-sessions',
+    async (request) => {
+      try {
+        const { projectId, sessionIds } = request.body;
+        if (!projectId || typeof projectId !== 'string') {
+          return { success: false, error: 'Project ID is required and must be a string' };
+        }
+        if (!Array.isArray(sessionIds) || sessionIds.some((id) => typeof id !== 'string')) {
+          return { success: false, error: 'Session IDs must be an array of strings' };
+        }
+
+        configManager.unhideSessions(projectId, sessionIds);
+        return { success: true };
+      } catch (error) {
+        logger.error('Error in POST /api/config/unhide-sessions:', error);
+        return { success: false, error: getErrorMessage(error) };
+      }
+    }
+  );
+
   // Select folders - no-op in browser mode
   app.post('/api/config/select-folders', async (): Promise<ConfigResult<string[]>> => {
     return { success: true, data: [] };

src/main/utils/jsonl.ts

@@ -562,14 +562,18 @@ export async function analyzeSessionFileMetadata(
       }
 
       // Last phase: final tokens - last post-compaction
+      // Guard: if the last compaction had no subsequent assistant message, post is 0.
+      // In that case, skip the final phase to avoid double-counting.
       const lastPhase = compactionPhases[compactionPhases.length - 1];
-      const lastContribution = lastMainAssistantInputTokens - lastPhase.post;
-      total += lastContribution;
-      phaseBreakdown.push({
-        phaseNumber: compactionPhases.length + 1,
-        contribution: lastContribution,
-        peakTokens: lastMainAssistantInputTokens,
-      });
+      if (lastPhase.post > 0) {
+        const lastContribution = lastMainAssistantInputTokens - lastPhase.post;
+        total += lastContribution;
+        phaseBreakdown.push({
+          phaseNumber: compactionPhases.length + 1,
+          contribution: lastContribution,
+          peakTokens: lastMainAssistantInputTokens,
+        });
+      }
 
       contextConsumption = total;
     }

src/renderer/components/chat/ChatHistory.tsx

@@ -413,23 +413,27 @@ export const ChatHistory = ({ tabId }: ChatHistoryProps): JSX.Element => {
       const prevItem = aiItemIndex > 0 ? conversation.items[aiItemIndex - 1] : null;
       if (prevItem?.type !== 'user') return;
 
-      const groupId = prevItem.group.id;
-      const element = chatItemRefs.current.get(groupId);
-      if (!element) return;
+      const run = async (): Promise<void> => {
+        const groupId = prevItem.group.id;
+        await ensureGroupVisible(groupId);
+        const element = chatItemRefs.current.get(groupId);
+        if (!element) return;
 
-      element.scrollIntoView({ behavior: 'smooth', block: 'center' });
-      setHighlightedGroupId(groupId);
-      setIsNavigationHighlight(true);
-      if (navigationHighlightTimerRef.current) {
-        clearTimeout(navigationHighlightTimerRef.current);
-      }
-      navigationHighlightTimerRef.current = setTimeout(() => {
-        setHighlightedGroupId(null);
-        setIsNavigationHighlight(false);
-        navigationHighlightTimerRef.current = null;
-      }, 2000);
+        element.scrollIntoView({ behavior: 'smooth', block: 'center' });
+        setHighlightedGroupId(groupId);
+        setIsNavigationHighlight(true);
+        if (navigationHighlightTimerRef.current) {
+          clearTimeout(navigationHighlightTimerRef.current);
+        }
+        navigationHighlightTimerRef.current = setTimeout(() => {
+          setHighlightedGroupId(null);
+          setIsNavigationHighlight(false);
+          navigationHighlightTimerRef.current = null;
+        }, 2000);
+      };
+      void run();
     },
-    [conversation, setHighlightedGroupId]
+    [conversation, ensureGroupVisible, setHighlightedGroupId]
   );
 
   // Handler to navigate to a specific tool within a turn from context panel