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Service-account auth structurally cannot see a regular user's personal
task lists (no equivalent of Calendar's per-item sharing model) --
confirmed via GetTaskLists returning exactly the service account's own
empty "My Tasks" list, never the real user's three lists. Zero rows
were ever cached in production as a result.
Adds a standard 3-legged OAuth flow: /settings/google-tasks/connect
redirects to Google's consent screen (AccessTypeOffline+ApprovalForce
so a refresh_token is always issued), /callback exchanges the code and
persists the token (new oauth_tokens table), /disconnect clears it.
GoogleTasksClient now takes an option.ClientOption instead of a
credentials file path; NewGoogleTasksOAuthClient wraps it with a
dbTokenSource that reloads/refreshes from the DB on each access-token
expiry and re-persists -- carefully preserving the original
refresh_token when Google's refresh response omits one (it usually
does), which would otherwise silently and permanently break future
refreshes.
Settings page shows connection status and a Connect/Disconnect
button. Calendar keeps using service-account auth (that one actually
works). Requires a one-time manual step: create an OAuth 2.0 Client ID
in Google Cloud Console and set GOOGLE_OAUTH_CLIENT_ID/SECRET in .env
-- documented in .env.example.
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