docs: close item 85, searching from the message pane

Five surfaces in the message pane offer a search built from what they show,
replacing the query or narrowing it. The details dialog became rows along the
way, which the user wanted independently of this feature.

Item 78 is narrowed to the rule shortcut alone and drops to S: item 85 built
the menus and item 81 the seeded dialog, so both halves already exist. Its
approach text is corrected too, since it claimed the thread list holds a usable
sender and notmuch_thread_get_authors returns a display summary, not an address.

Three traps recorded in CLAUDE.md: a modal dialog must close before the action
it asked for runs, Qt::RFC2822Date validates the weekday against the date, and
every query goes through SearchTerm so five surfaces cannot grow five quoting
rules.

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