chore(todo): brainstorm buffer-source extensions; correct EPUB nit to DONE

Modify C-; b p: add a dated subheader under the task with ideas for
extending the buffer-source dispatcher beyond audio files -- three
tiers (high-leverage / occasional / skip) covering eww, elfeed,
mu4e, org-mode-at-heading, dired/dirvish, doc-view, magit-log,
xref/grep, image-mode, archive-mode, plus an implementation sketch
(dispatch alist on major-mode with buffer-file-name fallback) and a
proposed rename to cj/copy-buffer-source-as-kill.

EPUB centering nit: was marked CANCELLED, but the visual-review
outcome was actually fine and the task is correctly closed as done
(not abandoned).  Flip CANCELLED -> DONE; CLOSED timestamp stays
since that's when the work-state finalized.

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