Close the colour menu on a pick, and make the push dot readable

Two cosmetics.

Picking a folder colour left the menu open, which every other action in
it does not. It closes now, the way the calendar's colour menu already
did.

The live-updates indicator was an 8px flat speck in --fg-faint, near
invisible in either theme, and it had two states where the code has
three. The push client only ever said connected or not, which cannot
tell "retrying with a backoff" from "stopped": it now reports
connecting, connected or disconnected, and the retry path says
connecting rather than going dark. pushConnected stays for the callers
that only want the boolean.

The dot is 12px and raised -- a white highlight over a solid colour with
a soft halo, so one bead reads on light and dark alike without a
per-theme variant. Green connected, amber reconnecting with a slow
pulse, red disconnected. The pulse respects prefers-reduced-motion, and
the indicator is labelled for a screen reader rather than hidden from
it, since it carries real information.

web/src/views/mail/MailboxTree.tsx

@@ -183,7 +183,7 @@ export function MailboxTree() {
         )}
       </nav>
       <Popover anchor={menu.anchor} onClose={menu.close} width={300}>
-        {menuTarget && <MailboxMenu mailbox={menuTarget} onCreateChild={() => void createFolder(menuTarget.id)} onShare={() => setShareTarget(menuTarget)} />}
+        {menuTarget && <MailboxMenu mailbox={menuTarget} onClose={menu.close} onCreateChild={() => void createFolder(menuTarget.id)} onShare={() => setShareTarget(menuTarget)} />}
       </Popover>
       {shareTarget && <ShareDialog kind="Mailbox" id={shareTarget.id} name={shareTarget.name} shareWith={shareTarget.shareWith ?? null} onClose={() => setShareTarget(null)} />}
     </>
@@ -290,7 +290,7 @@ function FolderRow({ mailbox: m, label, depth, hasChildren, open, hiddenUnread,
   );
 }
 
-function MailboxMenu({ mailbox: m, onCreateChild, onShare }: { mailbox: Mailbox; onCreateChild: () => void; onShare: () => void }) {
+function MailboxMenu({ mailbox: m, onClose, onCreateChild, onShare }: { mailbox: Mailbox; onClose: () => void; onCreateChild: () => void; onShare: () => void }) {
   const [, navigate] = useLocation();
   const colors = useSettings((s) => s.settings.folderColors);
   const update = useSettings((s) => s.update);
@@ -335,6 +335,7 @@ function MailboxMenu({ mailbox: m, onCreateChild, onShare }: { mailbox: Mailbox;
   const isSpecial = Boolean(m.role) && m.role !== "subscribed";
   const color = folderColor(colors, m.id);
   const setColor = (c: string | null) => {
+    onClose();
     const next = { ...colors };
     if (c) next[m.id] = c;
     else delete next[m.id];