[hkonsti]

Adds Gmail to the Google integration as an emails collection with the same fields, commands and record shape as the IMAP mailbox's (both now built by emailsCollection in the catalog), under seven new Google actions mapped to gmail.modify (Send also to gmail.send). connections/google/gmail-api.ts covers the Gmail v1 calls and the label-to-folder mapping: Inbox, Draft, Sent, Trash and Spam are labels, and Archive is a search for mail in none of them. records/google-emails.ts is the connector. Record ids are Gmail message ids, except drafts, which are draft-<draft id>. Marking, starring and archiving change labels, Move to Trash is messages.trash (never messages.delete), and mail is sent from the connection's address with MailComposer. Note on quota: Gmail allows 6,000 units per minute per user, and a list page of 50 costs about 1,000 (50 messages.get at 20 units each), so roughly six pages a minute; the docs say so.

Verified live against konsti@varislabs.com through the connector:

• Listed Inbox (50 plus a second page of 18, no repeats), Sent (25), Archive (4), Trash (1), Spam (10) and a has:attachment search (12). Opened 3 messages.
• Marked one unread, then read. Starred it, then unstarred it.
• Archived it and restored it with messages.modify. Trashed it and restored it with messages.untrash; untrash leaves INBOX off, so it was added back. Its labels ended exactly as before.
• Created a draft and edited its subject only: the id stayed the same, and To and body were kept. Found it in the Draft list and in an unfiltered search under its draft id, deleted it, and opening it then gave not found.
• Sent one email to self, found it in the Inbox and trashed it.

Stack: on #84; next: Drive writes and Sheets ranges.

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