YeonGyu-Kim e2e89b1f57 fix(tmux): skip agent area width guard when 0 agent panes exist
When no agent panes exist, mainPane.width equals windowWidth, making
agentAreaWidth zero. The early return guard blocked initial pane creation
before the currentCount === 0 handler could execute.

Add currentCount > 0 condition so the guard only fires when agent panes
already exist, allowing the bootstrap handler to evaluate canSplitPane.

Closes #1939
2026-02-18 17:30:05 +09:00
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