docs: add mail-overview to the inventory and its traps to the notes

Four of the notes generalise beyond this component. Two were measured while
building it: notmuch fails two different ways and only the rejected-query case
is detectable, the misparsed-query case returning a plausible wrong number
with exit 0; and notmuch deduplicates by message id, so one message with two
file paths is counted twice by a path glob and per-account counts then sum
above the total.

Two more were bugs found only by running the thing. Xapian replaces files on
commit, so a watch on a filename dies with it and the watch belongs on the
directory. And an INI section body is not everything up to the next bracket,
because values can contain brackets themselves: folders named [Gmail]/Bozze
ended a section before its label and three of five accounts quietly displayed
their raw key instead.

The Blur section gains the exclusion-zone note with its measured geometry,
since mail-overview is the first panel here that sits below waybar rather than
over it. The "Both" phrasing that assumed two components is now plural.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WWL8JYHu7yhAdtx5pU9PMU

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