v0.48.0: ACP streaming, Windows autoupdate, and bug fixes

- Windows autoupdate - Updates now work correctly on Windows using a deferred update strategy, applied on next startup
- Model selector - Removed GLM 4.6 from the model selector

Bug fixes

- Tool result rendering - Internal placeholder markers no longer displayed in CLI output
- Session loading - Fixed "Failed to load session" errors on cloud sessions
- Droid startup timeout - Increased timeout for start droid to prevent timeouts