feat: Modal focus trapping and ARIA attributes (a11y)#129
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- Create focusTrap.ts action: traps Tab cycling within modal, restores focus on close - Add role='dialog', aria-modal='true', aria-label to modal overlay - Add autofocus to close button for initial focus - Focus restoration to previously active element on modal close Closes #9
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focusTrap.tsaction: atrapa el foco Tab dentro del modal, cicla entre primer/último elementorole="dialog",aria-modal="true",aria-labelal overlay del modalautofocusen botón de cierre para foco inicialCloses #9