cosmetic: terminal tab shows brief rendering artifact on tab switch

[grimmerk]

When switching to the Terminal tab, there's a brief flash (~50ms) of incorrectly sized text before xterm.js re-fits to the container.

Cause: the terminal div transitions from display: none to display: flex, and fitAddon.fit() runs after a 50ms delay.

Possible fix: fit before making visible, or use visibility: hidden instead of display: none (keeps layout but hides visually).

🤖 On behalf of @grimmerk — generated with Claude Code

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