fix(web): make sidebar lists, monitor panels, and Tools placeholder fill height (#1663) (#1664)

Three related "fill the available height" layout fixes to the connected screens:

- Tools & Prompts sidebars: replace the fixed magic max-height on ToolControls/
  PromptControls with the Resources pattern — sidebar Card `variant="sidebar"`
  (full-height flex column) + `Stack flex={1} mih={0}` + a flex-filling
  ScrollArea — so the list runs to the bottom of the card before scrolling.
- Logs/Console/Protocol/Network standalone screens: only override ScreenLayout
  `h` when embedded. Passing `h={undefined}` clobbered the default
  `h: calc(100dvh - header)` (withProps plain-spreads), collapsing an empty
  screen to its controls' height. Also center the Network/Protocol empty states.
- Tools placeholder: render the "Select a tool" empty state in a full-height
  `DetailCard flex={1}` (like Prompts/Resources) instead of the content-sized
  preview card, so it fills the pane.


Claude-Session: https://claude.ai/code/session_015sMW1YZXkM7fDkdPtHpE95

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

clients/web/src/components/groups/ProtocolListPanel/ProtocolListPanel.tsx

@@ -54,10 +54,17 @@ const PanelContainer = Paper.withProps({
   variant: "panel",
 });
 
+// Centered in the full-height panel so the empty message sits mid-panel rather
+// than clinging to the top of an otherwise-empty box (matches LogStreamPanel).
+const EmptyCenter = Stack.withProps({
+  flex: 1,
+  align: "center",
+  justify: "center",
+});
+
 const EmptyState = Text.withProps({
   c: "dimmed",
   ta: "center",
-  py: "xl",
 });
 
 // The section header is a single "pleat" bar (rounded, with the filter-button
@@ -293,7 +300,9 @@ export function ProtocolListPanel({
       </Group>
 
       {!hasResults ? (
-        <EmptyState>No request history</EmptyState>
+        <EmptyCenter>
+          <EmptyState>No request history</EmptyState>
+        </EmptyCenter>
       ) : (
         <EmbeddableScrollArea embedded={embedded} viewportRef={viewportRef}>
           <Stack gap="md">