fix(inbox): reload mail content when switching items (+ filter refetch)

The appshell SDK useQuery only re-runs when the action changes, not the
variables — so switching mail items (same crm.mail.history action, new
threadId) never refetched and the reader kept the first thread's content
(only the subject, a direct prop, updated). Key MailReader by threadId to
remount it on switch (same pattern Messenger already uses for ThreadView).
Also force a refetch of crm.inbox.list when the filter changes, which hit
the same stale-variables bug.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/components/dashboard/inbox.tsx

@@ -135,8 +135,10 @@ function Detail({ it, onError, onDone, onSnooze, onArchive }: {
 
       {it.threadId ? (
         // A message/mail item → open the conversation to read + reply.
+        // key by threadId: the SDK's useQuery only refetches when the ACTION changes, not the
+        // variables — so switching items must remount MailReader to load the new thread's history.
         <div style={{ flex: 1, minHeight: 0 }}>
-          <MailReader threadId={it.threadId} subject={it.title} onError={onError} />
+          <MailReader key={it.threadId} threadId={it.threadId} subject={it.title} onError={onError} />
         </div>
       ) : (
         // A non-threaded item (e.g. a system alert) → show its detail.