feat(web): state the run state on the terminal card's prompt line

The terminal card showed no run state: a running command and a settled
command that produced no output rendered the same prompt line, so whether
a command was still running had to be inferred from the absence of output.

Lead the prompt line with a StateDot in three of its states — the spinning
ring while running, red for the same exit status that renders the status
pill, green for a clean settle. That is the same indicator a tool row's
leading icon carries, so a row and its own card cannot disagree about one
command; the row/card agreement is pinned in the ui-conversation spec.
StateDot is aria-hidden, so a visually hidden text label rides beside it,
which is what the refreshed aria goldens now record.

The e2e adds what jsdom cannot compute: the dot's color resolves to the
green success token through the real theme stylesheet, and the dot precedes
the prompt label in document order.

apps/web/tests/snapshots/navigation-panes/details-open.expected.md

@@ -3,6 +3,6 @@
 - text: Input json
 - button "复制"
 - code: "{ \"command\": \"echo NAVIGATION_OK\", \"description\": \"Print NAVIGATION_OK\" }"
-- text: Output $ echo NAVIGATION_OK
+- text: Output 已完成 $ echo NAVIGATION_OK
 - button "复制"
 - text: NAVIGATION_OK

apps/web/tests/snapshots/navigation-panes/terminal-card.expected.md

@@ -1,3 +1,3 @@
-- text: $ echo NAVIGATION_OK
+- text: 已完成 $ echo NAVIGATION_OK
 - button "复制"
 - text: NAVIGATION_OK