Improve code documentation and test descriptions

- Update test description to be self-explanatory without referencing issue number
- Add detailed comment explaining awareness state handling for disconnected users

Author: jhodapp

__tests__/components/ui/coaching-sessions/editor-cache-context.test.tsx

@@ -199,7 +199,7 @@ describe('EditorCacheProvider', () => {
     expect(screen.getByTestId('is-ready')).toHaveTextContent('no')
   })
 
-  describe('Provider Lifecycle (Issue #201 Fixes)', () => {
+  describe('Provider Lifecycle - Preventing Unnecessary Disconnections', () => {
     it('should NOT disconnect provider when re-rendering with same sessionId', async () => {
       const { TiptapCollabProvider } = await import('@hocuspocus/provider')
 

src/components/ui/coaching-sessions/editor-cache-context.tsx

@@ -198,6 +198,11 @@ export const EditorCacheProvider: React.FC<EditorCacheProviderProps> = ({
             const mergedUsers = new Map(prev.presenceState.users);
 
             // Mark users who disappeared from awareness as disconnected
+            // When users "disappear," it means they're no longer in the awareness states array -
+            // typically due to network disconnect, browser crash, or navigation away from the coaching
+            // session page. Without this code, disconnected users would instantly vanish from the UI,
+            // creating an unwanted UX. This preserves them as status: 'disconnected' instead, enabling
+            // smooth UX transitions (like showing grayed-out presence indicators).
             for (const [userId, oldPresence] of prev.presenceState.users) {
               if (!updatedUsers.has(userId) && oldPresence.status === 'connected') {
                 // User was connected but no longer in awareness states - mark as disconnected