clicking a message did nothing. the reading pane stayed on "Select an email to
read" whatever you opened, and it had been that way since email became a plugin.
the reader asks the URL which message is open. it asked for `emailId`, which was
the param name back when email was part of the platform and declared its own
`/email/:emailId` route. a plugin declares no routes: the platform mounts every
one at `<route>` and `<route>/:section`, so the id arrives as `section`. asking
for `emailId` got undefined, `selectedId` was null on every render, and the pane
rendered its empty state.
nothing else was wrong, which is why this took so long to place — the list
showed, the link navigated, the URL changed, and both API routes return full
data (verified against the real 19k-message store: /messages carries every
snippet, /thread/:id returns 55KB of html). one undefined param, and the whole
right-hand side of the screen looked dead.
still accepts `emailId`, so this keeps working if email ever gets its own route
again. the underlying smell is the platform naming a plugin's param for it —
worth fixing there, not here.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Officer-Session: 656f5c85-e49a-4f1f-b9f3-042a04b4d043