Add intent filters so LibreMail handles mailto: (ACTION_VIEW / SENDTO)
and email SEND / SEND_MULTIPLE intents, opening a prefilled compose screen.
- MailtoParser: pure RFC 6068 parser (multiple recipients, to/cc/bcc/
subject/body, percent-encoding; preserves a literal '+'); JVM-tested.
- IntentComposeParser: builds a ComposePrefill from a mailto: URI or the
EXTRA_EMAIL/CC/BCC/SUBJECT/TEXT share extras.
- MainActivity parses the launch/new intent and hands a one-shot prefill to
the NavHost (guarded against config-change duplication).
- Compose form gains a Bcc field; Routes carry cc/bcc/body deep-link args.
- bcc wired end-to-end: OutgoingMessage, SMTP + Graph senders, and outbox +
drafts persistence via Room migration v9 -> v10.
- Multi-account send is served by the existing From picker on compose.
Default mail app: Android exposes no public RoleManager email role, so the
intent filters are what make LibreMail appear on the system "Open by default"
/ default-apps screen where the platform/OEM supports it.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
JMR-devandClaude Opus 4.8
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