feat: choose the startup query by name

The app opened whichever saved query sorted first alphabetically, which
is not a choice anyone made: [queries] is read through childKeys(), so
savedQueries().first() means "Flagged" before "Inbox" before "Unread"
rather than anything the user expressed.

[general] startup_query names the entry to open and defaults to Unread,
so a fresh install comes up on the unified unread list. Saved-query
button order is untouched and stays alphabetical.

A name matching no saved query falls back to the first one rather than
starting with an empty view. That is reported as a problem only when the
user actually wrote the name; the built-in default naming a query they
never created is not something they got wrong, and warning about it
would fire on every launch of a config that has no Unread entry.

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

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