The LinkedIn Page connection has a two-step OAuth: first the
`callback` stashes the Socialite user in `linkedin_page_pending` and
redirects to the page picker, then `select` finalizes by writing the
chosen organization to social_accounts. The pending payload was missing
`approved_scopes`, and both finalize paths (`update` for reconnect,
`updateOrCreate` for first connect) never wrote the `scopes` column.
Result: every LinkedIn Page account had `scopes = NULL` in the DB,
the publish-time scope check saw `w_organization_social` as missing
and blocked every post with 'Missing permissions. Please reconnect
your account.'
Fix: stash `approved_scopes` in the session payload, then in both
finalize paths persist it with the same comma-split treatment used by
the LinkedIn personal controller (the LinkedIn-OpenID provider has the
same separator quirk — granted scopes come CSV-joined inside a
single Socialite array element).
Test: `linkedin page select splits comma-separated approvedScopes
before saving` covers the persist + split path.
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