docs: close items 93 and 95, record their traps

Item 93 ships four built-in filters composing with the account dropdown, and
absorbs item 90. Item 95 is the overflow-menu defect found while hand testing
it: pre-existing, not caused by 93, and recorded as its own item rather than
folded in.

Two traps go to CLAUDE.md because they are still true of the code. Qt emits no
triggered for a QAction owning a menu, which is why every entry in the saved
query menu had always been inert. And a generator must be asked for one
account's query rather than having its all-accounts query wrapped, since the
wrap returns the right rows by accident of path: being hierarchical and a
row-count test cannot tell the two apart.

A third goes beside the existing rendering-probe warnings: visualRect reports a
real height for a row scrolled out of the viewport, so a non-empty check passes
while the pixel loop measures nothing and blames the wrong defect.

The Upgrading note covers what a user sees: the row starts with four shipped
buttons, a duplicate name means one of theirs is now beside a built-in, and
their migrated Sent entry is unpinned for them rather than deleted.

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