Viewers are typically the client: they need to open a draft in the editor
to use the comments tab, but must not change anything.
- post editor (edit) now authorizes view, so viewers can open it; the
composer + schedule tab render read-only and the comments tab stays
interactive (defaults to the comments tab for viewers)
- all mutations stay member+ (update/delete) — the autosave/save/publish/
schedule/delete affordances are hidden and the PUT is still 403 for
viewers; SyncPostPlatforms only runs for users who can update
- drafts route to the editor for everyone again (reverts the read-only
Show detour); Show stays the published-post view
- /accounts now authorizes manageAccounts (admin+), so viewers and members
get 403; the Connections sidebar item is admin+ only and the connect/
disconnect grid is reverted to main (no per-button gating needed)
Tests: draft→editor redirect for every member, viewer can open the editor,
viewer cannot save, and only admins+ can open /accounts.
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