fix(web5): raise connected-nodes row-breakpoint height floor to 40rem (UIFIX-02)

Dorian verified the sibling-height match, internal scroll, and unchanged
stacked layout on his running dev session — all correct. The only issue was
the xl:min-h-[20rem] floor (an unmeasured judgement call, flagged as such in
01-12-PLAN.md): when node discovery is disabled, Web5NodeVisibility renders
short, the floor takes over, and 20rem left the Connected Nodes card looking
stunted. Doubled to xl:min-h-[40rem] per his direct instruction ("twice as
tall"). Test updated to pin the new value.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

neode-ui/src/views/web5/Web5ConnectedNodes.vue

@@ -1,6 +1,6 @@
 <template>
   <!-- Connected Nodes (P2P over Tor) -->
-  <div data-controller-container tabindex="0" class="glass-card p-6 scroll-mt-24 flex flex-col min-h-0 xl:min-h-[20rem]">
+  <div data-controller-container tabindex="0" class="glass-card p-6 scroll-mt-24 flex flex-col min-h-0 xl:min-h-[40rem]">
     <!-- Desktop: side-by-side layout -->
     <div class="hidden md:flex items-start gap-4 mb-4">
       <div class="flex-shrink-0 w-12 h-12 rounded-lg bg-white/10 flex items-center justify-center">

neode-ui/src/views/web5/__tests__/Web5ConnectedNodesScroll.test.ts

@@ -83,7 +83,7 @@ describe('Web5ConnectedNodes scroll contract (UIFIX-02)', () => {
     expect(classes).toContain('flex')
     expect(classes).toContain('flex-col')
     expect(classes).toContain('min-h-0')
-    expect(classes).toContain('xl:min-h-[20rem]')
+    expect(classes).toContain('xl:min-h-[40rem]')
   })
 
   it('still renders the empty-state row for each pane when the node list is empty', () => {