docs: record items 56 and 57 from the user's notes

Two notes added since this morning's pass, both presentation.

56: icons are inconsistent across the interface. The mechanism is not
missing, it is partial: the themeIcons table covers eight actions and
about twenty others get nothing, so adjacent menu entries disagree. The
names are not the obstacle either, probed against this desktop's theme
and every name a full set would need resolves. The second half of the
note, that buttons should honour "Icon only", is a real override: the
hardcoded setToolButtonStyle defeats the desktop's own setting.

57: rename the Flag action to Important or Starred. Label only. The
notmuch tag stays `flagged`, since it is wire format that neomutt and
the user's saved queries also read. The star glyph already ships in the
list column. Recorded that "Important" can take a free accelerator while
"Starred" collides with Mark &spam.

The first draft of 56 claimed there were no icons at all, which was
wrong: it missed the table at mainwindow.cpp:902 by grepping for the
call site rather than reading the setup. Corrected before commit.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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