Let the pane headers' paths actually trim

TextTrimming only acts when measure hands the block a finite width, and a
horizontal StackPanel never does — it measures every child at infinity and an
Auto grid column passes the full answer on. So both SFTP pane headers grew
with their path, and a directory deep enough pushed the header's own icon
buttons past the window's edge at the session shell's 472-pixel budget.

The layout suite has said so on every CI run since v5b landed, and nowhere
else: the runner's per-job HOME is a 46-character path, which is what the
local pane opens on, and every developer machine's short profile path left
the same test green. The path sits alone in the star column now — bounded
width, working ellipsis — and the narrowest-budget test pins both panes to
sixty-character paths so the question is asked on every machine alike;
against the old markup that test fails on Windows too.

src/DodoSSH.Client.App/Views/TransfersScreen.axaml

@@ -177,16 +177,27 @@
           thing (go to the parent directory), and the pair reading differently is the design's own choice
           faithfully carried over rather than a functional difference invented to justify it.
         -->
+        <!--
+          ◆ THE PATH SITS IN THE STAR COLUMN, ALONE, AND THAT PLACEMENT IS LOAD-BEARING.
+
+          TextTrimming only acts when measure hands the block a finite width, and a horizontal StackPanel
+          never does — it measures every child at infinity, takes the full answer, and an Auto grid column
+          passes that on. With the path in a StackPanel beside the label, a directory deep enough — the
+          remote pane meets one on any real host, this pane on any machine whose profile path is long —
+          made the header wider than the pane and pushed the icon buttons past the window's own edge. The
+          layout suite caught it at the 472-pixel session budget, on the one machine whose home directory
+          was long enough to arm it. Star column: bounded width, working ellipsis, buttons that stay.
+        -->
         <Border Grid.Row="0" Padding="0,0,0,10" BorderThickness="0">
           <Grid ColumnDefinitions="Auto,*,Auto">
-            <StackPanel Grid.Column="0" Orientation="Horizontal" Spacing="12" VerticalAlignment="Center">
-              <TextBlock Classes="label" FontSize="10" Text="LOCAL" VerticalAlignment="Center" />
-              <TextBlock Classes="mono" FontSize="13.5" FontWeight="Medium"
-                         Foreground="{StaticResource TextDim}" VerticalAlignment="Center"
-                         Text="{Binding LocalPath}" TextTrimming="CharacterEllipsis"
-                         ToolTip.Tip="{Binding LocalPath}" />
-            </StackPanel>
-            <StackPanel Grid.Column="2" Orientation="Horizontal" Spacing="4">
+            <TextBlock Grid.Column="0" Classes="label" FontSize="10" Text="LOCAL"
+                       VerticalAlignment="Center" Margin="0,0,12,0" />
+            <TextBlock Grid.Column="1" Classes="mono" FontSize="13.5" FontWeight="Medium"
+                       Foreground="{StaticResource TextDim}" VerticalAlignment="Center"
+                       HorizontalAlignment="Left"
+                       Text="{Binding LocalPath}" TextTrimming="CharacterEllipsis"
+                       ToolTip.Tip="{Binding LocalPath}" />
+            <StackPanel Grid.Column="2" Orientation="Horizontal" Spacing="4" Margin="12,0,0,0">
               <!--
                 The drives, because the breadcrumb cannot reach them: above C:\ is a list rather than a
                 directory. Without this the pane is stuck on whichever drive the user profile is on. Chips
@@ -332,19 +343,26 @@
           UP is arrow_downward here, matching arrow_upward on the local pane above per the design's own two
           distinct glyphs; see that pane's own remark on why the pair differs without the actions differing.
         -->
+        <!--
+          The path is alone in the star column for the reason the local pane's header remark spells out:
+          TextTrimming needs the finite width only a star column gives it, and this is the pane where the
+          long path is not even unusual — it is any host with a deep directory tree.
+        -->
         <Border Grid.Row="0" Padding="0,0,0,10" BorderThickness="0">
           <Grid ColumnDefinitions="Auto,*,Auto">
-            <StackPanel Grid.Column="0" Orientation="Horizontal" Spacing="12" VerticalAlignment="Center">
+            <StackPanel Grid.Column="0" Orientation="Horizontal" Spacing="12" VerticalAlignment="Center"
+                        Margin="0,0,12,0">
               <TextBlock Classes="label" FontSize="10" Text="HOST" VerticalAlignment="Center"
                          IsVisible="{Binding ShowsHostPicker}" />
               <TextBlock Classes="label" FontSize="10" Text="BUCKET" VerticalAlignment="Center"
                          IsVisible="{Binding ShowsBucketPicker}" />
-              <TextBlock Classes="mono" FontSize="13.5" FontWeight="Medium"
-                         Foreground="{StaticResource TextDim}" VerticalAlignment="Center"
-                         Text="{Binding RemotePath}" TextTrimming="CharacterEllipsis"
-                         ToolTip.Tip="{Binding RemotePath}" />
             </StackPanel>
-            <StackPanel Grid.Column="2" Orientation="Horizontal" Spacing="4">
+            <TextBlock Grid.Column="1" Classes="mono" FontSize="13.5" FontWeight="Medium"
+                       Foreground="{StaticResource TextDim}" VerticalAlignment="Center"
+                       HorizontalAlignment="Left"
+                       Text="{Binding RemotePath}" TextTrimming="CharacterEllipsis"
+                       ToolTip.Tip="{Binding RemotePath}" />
+            <StackPanel Grid.Column="2" Orientation="Horizontal" Spacing="4" Margin="12,0,0,0">
               <Button Classes="paneicon" Command="{Binding RemoteUpCommand}"
                       IsEnabled="{Binding IsConnected}" ToolTip.Tip="Up one directory">
                 <TextBlock FontFamily="{StaticResource IconFont}" FontSize="16" Text="&#xE5DB;" />