fix(shell): dock handle to the right edge; command bar fits

Wider consumable tiles overflowed the command bar, shoving END TURN under
the dock column. Trim the vitals min-width (230->120) and END TURN
(150->140) and separation so the row fits — END TURN lands cleanly at the
bottom-right, below the dock.

Move the dock handle to the outer (right) side per mock 2a: the menu now
sits left of the handle and slides right off-screen to hide, the handle
staying at the world's right edge. Dock sits flush to that edge.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

client/scenes/shell/SystemDock.tscn

@@ -6,7 +6,7 @@
 [node name="SystemDock" type="Control"]
 layout_mode = 3
 anchors_preset = 0
-offset_right = 240.0
+offset_right = 220.0
 offset_bottom = 420.0
 theme = ExtResource("2")
 script = ExtResource("1")
@@ -15,8 +15,8 @@ script = ExtResource("1")
 layout_mode = 1
 anchor_left = 1.0
 anchor_right = 1.0
-offset_left = -190.0
-offset_right = -10.0
+offset_left = -216.0
+offset_right = -36.0
 offset_bottom = 316.0
 grow_horizontal = 0
 theme_override_constants/separation = 10
@@ -76,9 +76,9 @@ anchor_left = 1.0
 anchor_top = 0.5
 anchor_right = 1.0
 anchor_bottom = 0.5
-offset_left = -222.0
+offset_left = -26.0
 offset_top = -52.0
-offset_right = -196.0
+offset_right = 0.0
 offset_bottom = 52.0
 grow_horizontal = 0
 grow_vertical = 2