docs: record manual verification items 4, 6-11

Items 4, 6, 7, 8, 9, 10 pass. Item 11 failed and was fixed in 9d13346.

Two findings worth keeping beyond the pass/fail:

The blank message pane (items 6, 9, 10) is exactly what this checklist
existed for. Every layer was correct in isolation and the pane still showed
nothing, because setHtml() does not navigate to the base URL it is given.
No unit test would have caught it; the first click did.

Item 7's initial failure was the checklist's fault, not the code's. The
suggested query term came from the thread's subject line, so notmuch
correctly matched all 22 messages and expanding them all was right. A test
query has to partition on something that varies per message.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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