docs(backlog): reconcile with the user's notes, and settle item 68

Eight entries from the notes had no item here. Appended as 66 to 73 with
each cause verified in the code rather than copied from the note: a blank
message pane on a first click (66), missing sent and drafts counts (67),
a forwarded-subject tag (68), passed and replied as words rather than
glyphs (69), pane icons against system icons (70), no sync after a
toolbar action (71), khard/khal (72), and this document's own size (73).

Item 68 arrived as "the passed tag appears for Fwd: but not Fw:, expand
it". Measured against the real database, that correlation does not
exist: 6 messages carry the tag in total, 194 Fwd: subjects carry none,
and every tagged message has P in its Maildir flags. The tag is the
Maildir P flag translated by notmuch under maildir.synchronize_flags,
written by whichever client forwarded the message. Nothing anywhere
reads a subject line, so there is no rule to expand. The section now
carries the measurements and costs the two real options, a display-only
mark against writing the flag out to 222 messages, and stays open
pending that decision.

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