Bump dashboards: bar, icon, forecast and clock widget types

Plumbing only: the widget-type literal and its dtype table on both sides,
the regenerated client, a curated lucide map and four stubs the renderers
are wired to. Also a latching switch and a segmented dropdown, both a
`style` on the control that already publishes and reads back, plus the
option editor a dropdown never had.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HTsT1isxUjw5gtkJk8WhuA

backend/tests/flow/test_dashboards.py

@@ -213,6 +213,7 @@ def test_a_widget_refuses_a_dtype_it_cannot_carry():
 def test_the_structured_widgets_bind_their_shapes():
     WidgetDef(id="a", type="agenda", config={"message": "a.b", "dtype": "list"})
     WidgetDef(id="n", type="notification", config={"message": "a.b", "dtype": "record"})
+    WidgetDef(id="f", type="forecast", config={"message": "a.b", "dtype": "list"})
 
     with pytest.raises(ValueError):
         WidgetDef(id="a", type="agenda", config={"message": "a.b", "dtype": "json"})
@@ -220,6 +221,41 @@ def test_the_structured_widgets_bind_their_shapes():
         WidgetDef(
             id="n", type="notification", config={"message": "a.b", "dtype": "list"}
         )
+    with pytest.raises(ValueError):
+        WidgetDef(id="f", type="forecast", config={"message": "a.b", "dtype": "json"})
+
+
+def test_a_bar_nests_a_second_number():
+    WidgetDef(
+        id="b",
+        type="bar",
+        config={
+            "message": "a.in",
+            "dtype": "float",
+            "inner": "a.pv",
+            "inner_dtype": "int",
+        },
+    )
+
+    with pytest.raises(ValueError):
+        WidgetDef(
+            id="b",
+            type="bar",
+            config={"message": "a.in", "dtype": "float", "inner_dtype": "bool"},
+        )
+
+
+def test_a_bar_is_drawn_on_both_readings_it_nests():
+    widget = WidgetDef(id="b", type="bar", config={"message": "a.in", "inner": "a.pv"})
+
+    assert widget.messages == ["a.in", "a.pv"]
+
+
+def test_a_clock_reads_nothing_and_publishes_nothing():
+    widget = WidgetDef(id="c", type="clock", config={"format": "24h"})
+
+    assert widget.messages == []
+    assert widget.target == ""
 
 
 def test_a_querying_chart_asks_with_a_record_and_draws_a_series():