Changelog

The search pill was placed in Grid Column 1 (*) between the title

(Auto) and actions (Auto). Since different plugins have different

title/action widths, the * column's center shifted per plugin.

Fix: span the search pill across all 3 columns (ColumnSpan=3) with

HorizontalAlignment.Center so it centers on the full toolbar width.

Title and actions render on top in their Auto columns. The search bar

now stays dead-center across all plugins.

The toolbar row used a Grid with no column definitions, causing all children

to overlap in a single cell. Title (Left), search (Center), and actions

(Right) relied on HorizontalAlignment alone, which centers the search pill

relative to the full grid width rather than the space between title and

actions. Switch to ColumnDefinitions="Auto,*,Auto" so the search pill

centers within the remaining space between title and actions.

Move ToastContainer from the root Panel (centered on entire window)

into the Grid.Column=1 content area Panel so toasts center on the

plugin view regardless of sidebar state.

Dismiss button: match the type icon's layout — 16x16 panel, centered

vertically, symmetric margin (10,0,12,0 mirroring 12,0,10,0), same

StrokeThickness=2. Both icon and dismiss are now vertically centered

instead of top-aligned.

Entrance: slide down from -40px with BounceEaseOut easing (0.4s) for a

subtle bounce effect. Exit: slide up -30px + fade out (0.3s) before

removal from collection.

ToastService now raises DismissRequested so the container can animate

out before the toast is removed. Manual dismiss clicks, action button

clicks, and auto-dismiss timer all use the same animated path. A

HashSet tracks in-flight dismissals to prevent double-dismiss races.

Hide the FriendlyLabel TextBlock when empty so the StackPanel

spacing doesn't push the message text down.