Simplify sound system with pack-based approach

- Remove complex per-event sound enable/disable settings
- Replace dual volume controls with single "Sound Pack Volume"
- Add "None" sound pack option to disable all sounds
- Fix boolean settings parsing in settings dialog
- Update documentation to reflect simplified sound system

Sound system is now intuitive: select a sound pack (or "None")
and set one volume level. Much cleaner than the previous
per-event checkboxes and confusing dual volume controls.

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

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

CLAUDE.md

@@ -249,8 +249,8 @@ Timeline Item: "Alice posted: Hello world (3 replies, collapsed)"
 - simpleaudio for cross-platform WAV playback with volume control
 - Subprocess fallback (sox/play on Linux, afplay on macOS, PowerShell on Windows)
 - Fallback to default pack if sound missing
-- Master volume and notification volume controls
-- Enable/disable per event
+- Single volume control for all sound pack audio
+- "None" sound pack option to disable all sounds
 - Pack discovery and validation
 - Smart threading (direct calls for simpleaudio, threaded for subprocess)
 
@@ -367,18 +367,11 @@ Timeline Item: "Alice posted: Hello world (3 replies, collapsed)"
 instance_url = https://example.social
 username = user
 timeline_refresh_interval = 60
+auto_refresh_enabled = true
 
 [audio]
-sound_pack = Doom
-master_volume = 100
-notification_volume = 100
-
-[sounds]
-private_message_enabled = true
-private_message_volume = 0.8
-mention_enabled = true
-mention_volume = 1.0
-# ... other sound settings
+sound_pack = default
+volume = 100
 
 [notifications]
 enabled = true
@@ -387,7 +380,6 @@ mentions = true
 boosts = false
 favorites = false
 follows = true
-timeline_updates = false
 
 [timeline]
 posts_per_page = 40