docs: design searching from the message pane as item 85

Item 78 asked for a tagging rule built from something visible in a message.
Brainstorming narrowed it: a saved query can already be promoted to a rule,
so the road from "I see something interesting" to "a rule tags it" exists as
search, save, promote. Searching is the missing step and the safe one, since
a query costs nothing when it is wrong while a rule runs unattended against
real mail.

The search half splits out as item 85. Five surfaces gain a context menu with
Search for this and Add to search: subject, date and From/To/Cc in the header,
tag chips, body selection, and every header per message in the details dialog,
which is rebuilt as rows rather than one text box.

Item 78 stays open carrying the rule shortcut alone.

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