fix(config): reject garbage numerics instead of silently reading zero, item 123

toInt() and toLongLong() return 0 on failure rather than the default, so a
typo in autosave_interval_ms produced a zero-interval timer. That timer is
restarted on every keystroke, so it would fire on the next event-loop pass
and turn a 30 second debounce into a Maildir write per keystroke, each one
uploaded by mbsync: exactly the behaviour the debounce exists to prevent.

This file already had the right shape in five places, a checked parse that
reports the bad value and keeps the default. The [compose] keys were the
only numerics skipping it. The interval is also clamped, since nothing
assigns a meaning to a zero or negative autosave.

quote_position now warns on an unrecognised value, matching sync_on_exit,
language and date_format; the only silent fallbacks in this file are for
absent keys rather than malformed ones. And a missing `sent` folder is a
notice rather than a problem, because the spec blesses that configuration
and a modal on every launch for a permanently correct setup is how users
learn to dismiss dialogs unread.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015muoUo2GdxmBDSp5vjYcbE

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