docs: plan item 85 as eight tasks

Eight TDD tasks. SearchTerm and the date parse first, since both are pure
logic testable without a widget; then one surface per task, the window's
wiring, and the suite check.

Two findings while planning, both now in the spec. The Date: header parse
already exists inside a file-local function in mimeparser.cpp, complete with
the fix for Qt::RFC2822Date rejecting a trailing timezone comment, so it is
extracted rather than rewritten. And queryRequested is the right precedent
but the wrong signature: these actions carry a replace-or-narrow flag, so a
second signal sits beside it and the placeholder links keep their gate.

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