docs(mail-overview): component notes

Records the decisions a later reader would otherwise reverse, each with the
measurement behind it: counting by the account tag rather than the path glob
qtmaildir itself uses, because notmuch deduplicates by message id and a glob
double-counts a message that arrived at two addresses; validating notmuch
output as an integer, because a rejected query prints nothing while a
misparsed one returns a plausible wrong number; and parsing the config by
walking lines, because account folders named like [Gmail]/Bozze end a
bracket-delimited section body before its label.

Also notes the one property that differs from the other two panels,
exclusionMode Normal, with the measured geometry showing the overlay starting
exactly where waybar ends.

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

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