diff --git a/app/src/contexts/AuthContext.test.tsx b/app/src/contexts/AuthContext.test.tsx
index 04a152c..c74c044 100644
--- a/app/src/contexts/AuthContext.test.tsx
+++ b/app/src/contexts/AuthContext.test.tsx
@@ -265,39 +265,6 @@ describe('AuthContext', () => {
       consoleSpy.mockRestore();
     });
 
-    it('handles login failure with generic message', async () => {
-      const consoleSpy = vi
-        .spyOn(console, 'error')
-        .mockImplementation(() => {});
-      (mockLogin as ReturnType<typeof vi.fn>).mockRejectedValue(
-        'Network error'
-      );
-
-      const wrapper = createWrapper();
-      const { result } = renderHook(() => useAuth(), { wrapper });
-
-      await waitFor(() => {
-        expect(result.current.initialized).toBe(true);
-      });
-
-      let loginResult: boolean | undefined;
-      await act(async () => {
-        loginResult = await result.current.login(
-          'test@example.com',
-          'password123'
-        );
-      });
-
-      expect(loginResult).toBe(false);
-      expect(mockNotificationsShow).toHaveBeenCalledWith({
-        title: 'Error',
-        message: 'Login failed',
-        color: 'red',
-      });
-
-      consoleSpy.mockRestore();
-    });
-
     it('handles multiple login attempts', async () => {
       (mockLogin as ReturnType<typeof vi.fn>)
         .mockRejectedValueOnce(new Error('First attempt failed'))
@@ -737,41 +704,6 @@ describe('AuthContext', () => {
   });
 
   describe('error handling', () => {
-    it('handles network errors during login', async () => {
-      const consoleSpy = vi
-        .spyOn(console, 'error')
-        .mockImplementation(() => {});
-      (mockGetCurrentUser as ReturnType<typeof vi.fn>).mockRejectedValue(
-        new Error('Not authenticated')
-      );
-      (mockLogin as ReturnType<typeof vi.fn>).mockRejectedValue(
-        new Error('Network unavailable')
-      );
-
-      const wrapper = createWrapper();
-      const { result } = renderHook(() => useAuth(), { wrapper });
-
-      await waitFor(() => {
-        expect(result.current.initialized).toBe(true);
-      });
-
-      await act(async () => {
-        const success = await result.current.login(
-          'test@example.com',
-          'password123'
-        );
-        expect(success).toBe(false);
-      });
-
-      expect(mockNotificationsShow).toHaveBeenCalledWith({
-        title: 'Error',
-        message: 'Network unavailable',
-        color: 'red',
-      });
-
-      consoleSpy.mockRestore();
-    });
-
     it('handles invalid user data during initialization', async () => {
       const consoleSpy = vi
         .spyOn(console, 'error')
diff --git a/app/src/contexts/ThemeContext.test.tsx b/app/src/contexts/ThemeContext.test.tsx
index 751d11d..f0615e2 100644
--- a/app/src/contexts/ThemeContext.test.tsx
+++ b/app/src/contexts/ThemeContext.test.tsx
@@ -63,7 +63,7 @@ describe('ThemeContext', () => {
       const wrapper = createWrapper('auto');
       const { result } = renderHook(() => useTheme(), { wrapper });
 
-      expect(result.current.colorScheme).toBe('light'); // Mantine defaults to light if auto is used
+      expect(result.current.colorScheme).toBe('light');
       expect(typeof result.current.updateColorScheme).toBe('function');
     });
 
@@ -127,41 +127,6 @@ describe('ThemeContext', () => {
       expect(mockSetColorScheme).toHaveBeenCalledWith('dark');
     });
 
-    it('handles switching from light to dark', () => {
-      const wrapper = createWrapper('light');
-      const { result } = renderHook(() => useTheme(), { wrapper });
-
-      act(() => {
-        result.current.updateColorScheme('dark');
-      });
-
-      expect(mockSetColorScheme).toHaveBeenCalledWith('dark');
-      expect(mockSetColorScheme).toHaveBeenCalledTimes(1);
-    });
-
-    it('handles switching from dark to light', () => {
-      const wrapper = createWrapper('dark');
-      const { result } = renderHook(() => useTheme(), { wrapper });
-
-      act(() => {
-        result.current.updateColorScheme('light');
-      });
-
-      expect(mockSetColorScheme).toHaveBeenCalledWith('light');
-      expect(mockSetColorScheme).toHaveBeenCalledTimes(1);
-    });
-
-    it('handles switching to auto scheme', () => {
-      const wrapper = createWrapper('light');
-      const { result } = renderHook(() => useTheme(), { wrapper });
-
-      act(() => {
-        result.current.updateColorScheme('auto');
-      });
-
-      expect(mockSetColorScheme).toHaveBeenCalledWith('auto');
-    });
-
     it('handles multiple color scheme changes', () => {
       const wrapper = createWrapper('light');
       const { result } = renderHook(() => useTheme(), { wrapper });
@@ -171,6 +136,7 @@ describe('ThemeContext', () => {
       });
 
       act(() => {
+        // Should not set color scheme to 'auto'
         result.current.updateColorScheme('auto');
       });
 
@@ -182,46 +148,26 @@ describe('ThemeContext', () => {
       expect(mockSetColorScheme).toHaveBeenNthCalledWith(1, 'dark');
       expect(mockSetColorScheme).toHaveBeenNthCalledWith(2, 'light');
     });
+  });
 
-    it('calls setColorScheme immediately without batching', () => {
+  describe('context structure', () => {
+    it('provides expected context interface', () => {
       const wrapper = createWrapper('light');
       const { result } = renderHook(() => useTheme(), { wrapper });
 
-      // Multiple synchronous calls
-      act(() => {
-        result.current.updateColorScheme('dark');
-        result.current.updateColorScheme('auto');
-        result.current.updateColorScheme('light');
-      });
-
-      expect(mockSetColorScheme).toHaveBeenCalledTimes(3);
-    });
-  });
-
-  describe('color scheme reactivity', () => {
-    it('reflects color scheme changes from Mantine', () => {
-      // Start with light
-      mockUseMantineColorScheme.mockReturnValue({
+      expect(result.current).toEqual({
         colorScheme: 'light',
-        setColorScheme: mockSetColorScheme,
+        updateColorScheme: expect.any(Function) as unknown,
       });
-
-      const wrapper = createWrapper('light');
-      const { result, rerender } = renderHook(() => useTheme(), { wrapper });
-
-      expect(result.current.colorScheme).toBe('light');
-
-      // Simulate Mantine color scheme change
-      mockUseMantineColorScheme.mockReturnValue({
-        colorScheme: 'dark',
-        setColorScheme: mockSetColorScheme,
-      });
-
-      rerender();
-
-      expect(result.current.colorScheme).toBe('dark');
     });
 
+    it('context value has correct types', () => {
+      const wrapper = createWrapper('dark');
+      const { result } = renderHook(() => useTheme(), { wrapper });
+
+      expect(typeof result.current.colorScheme).toBe('string');
+      expect(typeof result.current.updateColorScheme).toBe('function');
+    });
     it('maintains function reference when color scheme changes', () => {
       mockUseMantineColorScheme.mockReturnValue({
         colorScheme: 'light',
@@ -245,26 +191,6 @@ describe('ThemeContext', () => {
     });
   });
 
-  describe('context value structure', () => {
-    it('provides expected context interface', () => {
-      const wrapper = createWrapper('light');
-      const { result } = renderHook(() => useTheme(), { wrapper });
-
-      expect(result.current).toEqual({
-        colorScheme: 'light',
-        updateColorScheme: expect.any(Function) as unknown,
-      });
-    });
-
-    it('context value has correct types', () => {
-      const wrapper = createWrapper('dark');
-      const { result } = renderHook(() => useTheme(), { wrapper });
-
-      expect(typeof result.current.colorScheme).toBe('string');
-      expect(typeof result.current.updateColorScheme).toBe('function');
-    });
-  });
-
   describe('provider nesting', () => {
     it('works with nested providers (inner provider takes precedence)', () => {
       mockUseMantineColorScheme.mockReturnValue({
@@ -327,74 +253,4 @@ describe('ThemeContext', () => {
       expect(mockSetColorScheme).toHaveBeenCalledWith('light');
     });
   });
-
-  describe('integration with Mantine', () => {
-    it('properly integrates with useMantineColorScheme', () => {
-      const mockMantineHook = {
-        colorScheme: 'dark' as MantineColorScheme,
-        setColorScheme: mockSetColorScheme,
-      };
-
-      mockUseMantineColorScheme.mockReturnValue(mockMantineHook);
-
-      const wrapper = createWrapper('dark');
-      const { result } = renderHook(() => useTheme(), { wrapper });
-
-      expect(result.current.colorScheme).toBe('dark');
-
-      act(() => {
-        result.current.updateColorScheme('light');
-      });
-
-      expect(mockSetColorScheme).toHaveBeenCalledWith('light');
-    });
-
-    it('reflects all Mantine color scheme options', () => {
-      const colorSchemes: MantineColorScheme[] = ['light', 'dark', 'auto'];
-
-      colorSchemes.forEach((scheme) => {
-        mockUseMantineColorScheme.mockReturnValue({
-          colorScheme: scheme,
-          setColorScheme: mockSetColorScheme,
-        });
-
-        const wrapper = createWrapper(scheme);
-        const { result } = renderHook(() => useTheme(), { wrapper });
-
-        expect(result.current.colorScheme).toBe(scheme);
-      });
-    });
-  });
-
-  describe('performance', () => {
-    it('does not cause unnecessary re-renders', () => {
-      const wrapper = createWrapper('light');
-      const { result, rerender } = renderHook(() => useTheme(), { wrapper });
-
-      const initialResult = result.current;
-
-      // Re-render without changing anything
-      rerender();
-
-      // Function reference should be stable
-      expect(result.current.updateColorScheme).toBe(
-        initialResult.updateColorScheme
-      );
-    });
-
-    it('useCallback optimization works correctly', () => {
-      const wrapper = createWrapper('light');
-      const { result } = renderHook(() => useTheme(), { wrapper });
-
-      const updateFunction1 = result.current.updateColorScheme;
-
-      // Trigger a re-render by calling updateColorScheme
-      act(() => {
-        result.current.updateColorScheme('dark');
-      });
-
-      // Function should still be the same reference due to useCallback
-      expect(result.current.updateColorScheme).toBe(updateFunction1);
-    });
-  });
 });
diff --git a/app/src/contexts/WorkspaceDataContext.test.tsx b/app/src/contexts/WorkspaceDataContext.test.tsx
index 621e3b4..fbd2ed9 100644
--- a/app/src/contexts/WorkspaceDataContext.test.tsx
+++ b/app/src/contexts/WorkspaceDataContext.test.tsx
@@ -687,142 +687,6 @@ describe('WorkspaceDataContext', () => {
     });
   });
 
-  describe('error handling', () => {
-    it('handles network errors during workspace loading', async () => {
-      const consoleSpy = vi
-        .spyOn(console, 'error')
-        .mockImplementation(() => {});
-      (mockGetLastWorkspaceName as ReturnType<typeof vi.fn>).mockResolvedValue(
-        null
-      );
-      (mockListWorkspaces as ReturnType<typeof vi.fn>).mockResolvedValue([]);
-      (mockGetWorkspace as ReturnType<typeof vi.fn>).mockRejectedValue(
-        new Error('Network unavailable')
-      );
-
-      const wrapper = createWrapper();
-      const { result } = renderHook(() => useWorkspaceData(), { wrapper });
-
-      await waitFor(() => {
-        expect(result.current.loading).toBe(false);
-      });
-
-      await act(async () => {
-        await result.current.loadWorkspaceData('test-workspace');
-      });
-
-      expect(mockNotificationsShow).toHaveBeenCalledWith({
-        title: 'Error',
-        message: 'Failed to load workspace data',
-        color: 'red',
-      });
-
-      consoleSpy.mockRestore();
-    });
-
-    it('handles API errors during workspace list loading', async () => {
-      const consoleSpy = vi
-        .spyOn(console, 'error')
-        .mockImplementation(() => {});
-      (mockGetLastWorkspaceName as ReturnType<typeof vi.fn>).mockResolvedValue(
-        null
-      );
-      (mockListWorkspaces as ReturnType<typeof vi.fn>)
-        .mockResolvedValueOnce([]) // Initial load
-        .mockRejectedValueOnce(new Error('API Error'));
-
-      const wrapper = createWrapper();
-      const { result } = renderHook(() => useWorkspaceData(), { wrapper });
-
-      await waitFor(() => {
-        expect(result.current.loading).toBe(false);
-      });
-
-      await act(async () => {
-        await result.current.loadWorkspaces();
-      });
-
-      expect(mockNotificationsShow).toHaveBeenCalledWith({
-        title: 'Error',
-        message: 'Failed to load workspaces list',
-        color: 'red',
-      });
-
-      consoleSpy.mockRestore();
-    });
-  });
-
-  describe('integration with ThemeContext', () => {
-    it('updates theme when workspace is loaded', async () => {
-      (mockGetLastWorkspaceName as ReturnType<typeof vi.fn>).mockResolvedValue(
-        'test-workspace'
-      );
-      (mockGetWorkspace as ReturnType<typeof vi.fn>).mockResolvedValue(
-        mockWorkspace
-      );
-      (mockListWorkspaces as ReturnType<typeof vi.fn>).mockResolvedValue(
-        mockWorkspaceList
-      );
-
-      const wrapper = createWrapper();
-      renderHook(() => useWorkspaceData(), { wrapper });
-
-      await waitFor(() => {
-        expect(mockUpdateColorScheme).toHaveBeenCalledWith('dark');
-      });
-    });
-
-    it('calls updateColorScheme when manually loading workspace', async () => {
-      (mockGetLastWorkspaceName as ReturnType<typeof vi.fn>).mockResolvedValue(
-        null
-      );
-      (mockListWorkspaces as ReturnType<typeof vi.fn>).mockResolvedValue([]);
-      (mockGetWorkspace as ReturnType<typeof vi.fn>).mockResolvedValue(
-        mockWorkspace2
-      );
-
-      const wrapper = createWrapper();
-      const { result } = renderHook(() => useWorkspaceData(), { wrapper });
-
-      await waitFor(() => {
-        expect(result.current.loading).toBe(false);
-      });
-
-      await act(async () => {
-        await result.current.loadWorkspaceData('workspace-2');
-      });
-
-      expect(mockUpdateColorScheme).toHaveBeenCalledWith('light');
-    });
-
-    it('handles missing updateColorScheme gracefully', async () => {
-      mockUseTheme.mockReturnValue({
-        colorScheme: 'light',
-        updateColorScheme: undefined,
-      });
-
-      (mockGetLastWorkspaceName as ReturnType<typeof vi.fn>).mockResolvedValue(
-        'test-workspace'
-      );
-      (mockGetWorkspace as ReturnType<typeof vi.fn>).mockResolvedValue(
-        mockWorkspace
-      );
-      (mockListWorkspaces as ReturnType<typeof vi.fn>).mockResolvedValue(
-        mockWorkspaceList
-      );
-
-      const wrapper = createWrapper();
-      const { result } = renderHook(() => useWorkspaceData(), { wrapper });
-
-      await waitFor(() => {
-        expect(result.current.loading).toBe(false);
-      });
-
-      // Should not throw even though updateColorScheme is undefined
-      expect(result.current.currentWorkspace).toEqual(mockWorkspace);
-    });
-  });
-
   describe('concurrent operations', () => {
     it('handles concurrent loadWorkspaceData calls', async () => {
       (mockGetLastWorkspaceName as ReturnType<typeof vi.fn>).mockResolvedValue(