Clicking Send threw "this.controller.handleDmAppShellSendMessage is not a
function". The DM app-shell renderer wires its callbacks on `this.controller`
(ProfileDirectMessageController), but the controller never delegated them to
`this.actions` — so Send, mark-read, mark-all-read, read-receipt/typing
toggles and open-settings all threw and did nothing. Add the six delegations.
The send path itself (encrypt -> sign -> publish) was fine.
Regression test asserts the controller delegates each app-shell callback to
this.actions.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
