fix(tui): remove the shift+enter newline hint from the setup footer

[devin-ai-integration]

Summary

Drops the shift+enter newline hint from the TUI setup footer (setupHintsView) — most terminals don't send a distinguishable shift+enter sequence, so the hint advertised a keybinding that rarely works. The footer now shows just enter launch scan ctrl+c quit. The bindings themselves (shift+enter/alt+enter/ctrl+j) are untouched for terminals that do support them.

Link to Devin session: https://app.devin.ai/sessions/9669bdcfeb374158972c1b27eacb9e42
Requested by: @0xallam

[devin-ai-integration]

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[greptile-apps]

Greptile Summary

Removes the misleading shift+enter newline hint from the TUI setup footer while preserving the existing keybindings.

• The footer now displays only enter launch scan and ctrl+c quit.
• The narrow-width fallback remains unchanged.

Confidence Score: 5/5

The PR appears safe to merge.

The change only removes a misleading footer hint and leaves keyboard handling and width fallback logic intact.

Important Files Changed

Filename	Overview
strix/interface/tui/internal/app/setup.go	Removes one unsupported keyboard hint from the setup footer without changing input handling or layout fallback behavior.

_{Reviews (1): Last reviewed commit: "fix(tui): drop the shift+enter newline h..." | Re-trigger Greptile}