Two issues prevented the bell emoji from clearing reliably:
1. Race on tab return: clearBellState() runs on visibilitychange/focus,
but the WebSocket has buffered output from while the tab was hidden.
The terminal processes it immediately, onBell fires, and the bell is
right back. Fixed with a 1-second suppression window after clearing —
bells from buffered output are ignored.
2. Bell stays when clicking without typing: the bell only cleared on
onData (keyboard input). If you clicked the terminal or just switched
back without typing, the emoji persisted. Added a mousedown listener
on the terminal element to clear it on any mouse interaction.
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