Collapse LinkedIn to one content type per account kind (linkedin_post, linkedin_page_post). Publishers infer the publish format from the attached media — text, single image/video, multi-image carousel, or PDF document — matching how facebook_post/x_post already work; PDF is exclusive of any other attachment. Removes the editor variant picker, keeping only the PDF document title field. Includes a data migration collapsing the retired carousel/document content types.
Replace the two LinkedIn account cards with a single Connect LinkedIn button: one unified OAuth grant (linkedin-openid driver, union of scopes) then a post-callback identity picker to post as the personal profile (linkedin) or a company page the member administers (linkedin-page). The chosen organization is validated against the admin-verified list from the OAuth grant. Per-capability gating via LINKEDIN_ENABLED / LINKEDIN_PAGE_ENABLED supports profile-only or org-only self-hosting. Removes LinkedInPageController, LinkedInTokenSynchronizer, the standalone linkedin-page connect routes, and the unused redirect_page config.
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