Drop `ChartView._maxmin()` usage in `.ui._fsp`

Removes the multi-maxmin usage as well as ensures appropriate `Viz` refs
are passed into the view methods now requiring it. Also drops the "back
linking" of the vlm chart view to the source OHLC chart since we're
going to add this as a default to the charting API.

piker/ui/_fsp.py

@@ -282,9 +282,10 @@ async def run_fsp_ui(
         # profiler(f'fsp:{name} chart created')
 
         # first UI update, usually from shm pushed history
+        viz = chart.get_viz(array_key)
         update_fsp_chart(
             chart,
-            chart.get_viz(array_key),
+            viz,
             name,
             array_key=array_key,
         )
@@ -311,7 +312,7 @@ async def run_fsp_ui(
         #     level_line(chart, 70, orient_v='bottom')
         #     level_line(chart, 80, orient_v='top')
 
-        chart.view._set_yrange()
+        chart.view._set_yrange(viz=viz)
         # done()  # status updates
 
         # profiler(f'fsp:{func_name} starting update loop')
@@ -665,7 +666,7 @@ async def open_vlm_displays(
         # built-in vlm which we plot ASAP since it's
         # usually data provided directly with OHLC history.
         shm = ohlcv
-        ohlc_chart = linked.chart
+        # ohlc_chart = linked.chart
 
         vlm_chart = linked.add_plot(
             name='volume',
@@ -683,13 +684,10 @@ async def open_vlm_displays(
             # the curve item internals are pretty convoluted.
             style='step',
         )
-        vlm_chart.view.enable_auto_yrange()
-
-        # back-link the volume chart to trigger y-autoranging
-        # in the ohlc (parent) chart.
-        ohlc_chart.view.enable_auto_yrange(
-            src_vb=vlm_chart.view,
-        )
+        vlm_viz = vlm_chart._vizs['volume']
+        # vlm_chart.view.enable_auto_yrange(
+        #     viz=vlm_viz,
+        # )
 
         # force 0 to always be in view
         def multi_maxmin(
@@ -741,7 +739,9 @@ async def open_vlm_displays(
         )
 
         # size view to data once at outset
-        vlm_chart.view._set_yrange()
+        vlm_chart.view._set_yrange(
+            viz=vlm_viz
+        )
 
         # add axis title
         axis = vlm_chart.getAxis('right')
@@ -827,7 +827,7 @@ async def open_vlm_displays(
             )
 
             # add custom auto range handler
-            dvlm_pi.vb._maxmin = group_mxmn
+            # dvlm_pi.vb._maxmin = group_mxmn
 
             # add dvlm (step) curves to common view
             def chart_curves(
@@ -926,11 +926,11 @@ async def open_vlm_displays(
 
             )
             # add custom auto range handler
-            tr_pi.vb.maxmin = partial(
-                multi_maxmin,
-                # keep both regular and dark vlm in view
-                names=trade_rate_fields,
-            )
+            # tr_pi.vb.maxmin = partial(
+            #     multi_maxmin,
+            #     # keep both regular and dark vlm in view
+            #     names=trade_rate_fields,
+            # )
             tr_pi.hideAxis('bottom')
 
             chart_curves(