Persist selected OAuth provider on callback so it stops reverting to KamoMail

Shipped: July 8, 2026 at 9:51 PM UTC
Author: Kamo
Commit: e97fc05

Switching an org to Microsoft 365 (or Google Workspace / Zoho) never stuck: the OAuth callback stored tokens and only flipped status on a pre-existing provider row, never writing provider_type and no-op'ing entirely when the org had no row. The read path then fell back to the hard-coded KAMO_MAIL default, so the settings page reverted. Upsert the org_email_providers row with the provider carried in the OAuth state and mark it ACTIVE. Adds OAuthFlowServiceTest covering the no-row and KamoMail-row cases.

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