CONTEXT: Several interactive elements lacked Escape key handlers: the email library modal was not in dynamicModals, the model-picker popup had no Escape close, and the session/model sort dropdowns only closed on outside click.
CHANGE: Adds email-lib-modal to the dynamicModals array in the Escape handler so it gets dismissed via dismissModal. Adds a check for model-picker-menu.open before the modal chain to close the dropdown on Escape. Adds checks for session-sort-dropdown and model-sort-dropdown display=block before the document panel minimize fallback.
WHY: Users expect consistent Escape-to-close behavior across all modals, overlays, and popups. These four were the only interactive containers in the app that ignored the Escape key entirely.
IMPACT: Pressing Escape now closes the email library modal, model picker popup, session sort dropdown, and model sort dropdown -- matching user expectations and the behavior of every other modal in the app.
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