Fix: Prevent hangs and failures in task system

A few async functions were swallowing errors or could leave commands stuck waiting forever:
- The »Open in Terminal« command could hang if osascript failed to start. It now reports the failure instead.
- ZLS config sync ran without error handling. Errors now show up in the log.
- Task discovery would block indefinitely if `zig build --list-steps` got stuck. It now gives up after a minute and moves on.

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