Add audio feedback for autocomplete suggestions

- Implemented autocomplete sound notification system for accessibility
- Added gentle 150ms chime (800Hz) when autocomplete suggestions appear
- Enhanced AutocompleteTextEdit to accept sound_manager parameter
- Created automatic sound generation for default pack (autocomplete.wav)
- Added play_autocomplete() method to SoundManager with 30% volume
- Sound includes 20ms fade in/out to prevent audio clicks
- Provides valuable audio feedback for screen reader users

🤖 Generated with [Claude Code](https://claude.ai/code)

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

src/audio/sound_manager.py

@@ -153,12 +153,53 @@ class SoundManager:
                     "success": "success.wav",
                     "error": "error.wav",
                     "expand": "expand.wav",
-                    "collapse": "collapse.wav"
+                    "collapse": "collapse.wav",
+                    "autocomplete": "autocomplete.wav"
                 }
             }
             
             with open(pack_file, 'w') as f:
                 json.dump(pack_data, f, indent=2)
+        
+        # Create default autocomplete sound if it doesn't exist
+        autocomplete_sound = default_dir / "autocomplete.wav"
+        if not autocomplete_sound.exists():
+            self.create_autocomplete_sound(autocomplete_sound)
+                
+    def create_autocomplete_sound(self, output_path: Path):
+        """Create a simple autocomplete notification sound"""
+        try:
+            # Parameters for a gentle notification chime
+            sample_rate = 22050  # Lower sample rate for smaller file
+            duration = 0.15  # Short 150ms sound
+            frequency = 800  # Pleasant mid-range frequency
+            
+            # Generate time array
+            t = np.linspace(0, duration, int(sample_rate * duration), False)
+            
+            # Create a gentle chime with fade in/out to avoid clicks
+            tone = np.sin(2 * np.pi * frequency * t)
+            
+            # Add slight fade in/out to prevent audio clicks
+            fade_samples = int(sample_rate * 0.02)  # 20ms fade
+            tone[:fade_samples] *= np.linspace(0, 1, fade_samples)
+            tone[-fade_samples:] *= np.linspace(1, 0, fade_samples)
+            
+            # Reduce volume to be gentle
+            tone *= 0.3
+            
+            # Convert to 16-bit PCM
+            audio = (tone * 32767).astype(np.int16)
+            
+            # Write WAV file
+            with wave.open(str(output_path), 'w') as wav_file:
+                wav_file.setnchannels(1)  # Mono
+                wav_file.setsampwidth(2)  # 16-bit
+                wav_file.setframerate(sample_rate)
+                wav_file.writeframes(audio.tobytes())
+                
+        except Exception as e:
+            print(f"Failed to create autocomplete sound: {e}")
                 
     def load_current_pack(self):
         """Load the currently selected sound pack"""
@@ -393,6 +434,10 @@ class SoundManager:
         """Play thread collapse sound"""
         self.play_event("collapse")
         
+    def play_autocomplete(self):
+        """Play autocomplete available sound"""
+        self.play_event("autocomplete")
+        
     def test_sound(self, event_type: str):
         """Test play a specific sound type"""
         self.play_event(event_type)

src/widgets/autocomplete_textedit.py

@@ -16,9 +16,12 @@ class AutocompleteTextEdit(QTextEdit):
     mention_requested = Signal(str)  # Emitted when user types @ to request user list
     emoji_requested = Signal(str)    # Emitted when user types : to request emoji list
     
-    def __init__(self, parent=None):
+    def __init__(self, parent=None, sound_manager=None):
         super().__init__(parent)
         
+        # Sound manager for audio feedback
+        self.sound_manager = sound_manager
+        
         # Lists for autocomplete
         self.mention_list = []  # Will be populated from followers/following
         self.emoji_list = []    # Will be populated from instance custom emojis
@@ -199,8 +202,6 @@ class AutocompleteTextEdit(QTextEdit):
             match_full = name_lower.startswith(prefix_lower)
             if match_username or match_full:
                 matches.append(name)
-            else:
-        
         
         if matches:
             self.show_completer(matches, prefix, start_pos, 'mention')
@@ -256,6 +257,10 @@ class AutocompleteTextEdit(QTextEdit):
         popup = self.completer.popup()
         popup.setAccessibleName(f"{completion_type.title()} Autocomplete")
         
+        # Play autocomplete available sound
+        if self.sound_manager:
+            self.sound_manager.play_autocomplete()
+        
     def hide_completer(self):
         """Hide the completer"""
         if self.completer:

src/widgets/compose_dialog.py

@@ -74,7 +74,7 @@ class ComposeDialog(QDialog):
         layout.addWidget(self.char_count_label)
         
         # Main text area with autocomplete
-        self.text_edit = AutocompleteTextEdit()
+        self.text_edit = AutocompleteTextEdit(sound_manager=self.sound_manager)
         self.text_edit.setAccessibleName("Post Content")
         self.text_edit.setAccessibleDescription("Enter your post content here. Type @ for mentions, : for emojis. Press Tab to move to post options.")
         self.text_edit.setPlaceholderText("What's on your mind? Type @ for mentions, : for emojis")