fix(agenda): stop the frame's catch-all from swallowing input machinery

The default-deny [t] binding intercepted far more than Org commands. switch-frame events hit the deny handler, so every focus change into or out of the frame spammed the read-only message and broke frame switching. Mouse wheel, mouse-1 clicks, and the help prefix were dead. And S-<f8>/C-M-<f8> were never bound in the mode map, so the frame's own toggle couldn't close it from inside.

I punched the machinery through the catch-all (an explicit nil shadows the [t] default in the same map, so those events fall through to their global bindings) and bound the two frame controls per the spec's allowlist.

Two redo-lifecycle bugs rode along, both from org-agenda-mode's kill-all-local-variables: the buffer-local kill-buffer-hook was stripped on the first refresh tick (killing the buffer would orphan the frame), and the failure banner was held in a buffer-local var while its overlay survives erase-buffer, so a banner could never be removed after a later success. The finalize re-enable now re-adds the hook, and the banner is tagged with an overlay property and found by scanning.

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