fix(startup): let startup_query name a built-in filter, and run it

Two defects, both reachable only after item 93.

startupSavedQuery() searched the saved queries alone, so a startup_query of
"Inbox" matched nothing once Inbox shipped as a built-in filter and the
duplicated entry was removed from queries.json. It then fell back to
m_savedQueries.first(), which is an arbitrary choice that used to look
reasonable while every install carried an Inbox entry: with the duplicates gone
it opened on a leftover search for one sender, and an empty queries.json opened
on nothing at all. The search now covers the saved queries first, so the user's
own entry wins a name collision, then the built-in filters; the fallback is the
Unread filter, which is always present.

The default startup name has always been "Unread" and now resolves for the
first time: before this it named nothing unless the user happened to have such
an entry.

The constructor also read startup.query directly, and a generated entry stores
no query at all, so even a matching filter opened an empty bar. It resolves
through Config::resolvedQuery() now, unscoped, since the account dropdown
starts on "All accounts".

Icons per the user's choices: a star for Important rather than the flag
action's own icon, since on the query row an icon reads as a category rather
than as an instruction, and mail-folder-sent rather than mail-sent.

Three tests changed rather than adapted, because their premises were the
defect. Two asserted the first-saved-query fallback.
aCronSyncDoesNotRefreshBeforeAnyQueryHasRun assumed a fresh window had run no
query, which is no longer true; it is now
aCronSyncRefreshesTheLastRunQueryNotTheQueryBar and asserts the property that
actually matters on a cron timer, through a new lastRunQueryForTesting() seam,
since a legitimate refresh bumps the generation and the counter cannot tell the
two apart.

0 files changed, 0 insertions, 0 deletions