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Native <dialog>.showModal() moves focus inside the dialog on open but doesn't trap Tab / Shift+Tab, and focus restoration on close is inconsistent across engines. Add three things to the dialog controller: - Capture document.activeElement before showModal() so the trigger is recoverable when the dialog closes (ESC, backdrop click, explicit close button, programmatic close all route through the native close event). - Wrap Tab inside the dialog so a keyboard user can't tab out into the scrim-covered page behind. - Restore focus to the captured trigger on the close event. If the trigger has been detached (Turbo morphed it out), skip silently rather than throw. Verified manually: opening the new-goal modal moves focus to the name input; ESC restores focus to the "New goal" link; Tab wraps from the last focusable back to the first.