feat(settings): open Assistenten on Kunskap with the konteringskarta first (#1044)

The Assistenten settings hub used to open on Minne, with the
konteringskarta buried two clicks away (Kunskap tab, below a second
nested tab row). Now /settings/assistant opens on Kunskap and the
LedgerGraph hero is the first thing on screen.

- Kunskap is the default view and first tab; Minne moves to ?view=memory
  (old ?view=knowledge links still resolve to the default)
- Drop the nested Kompetens/Minne/Regler & profil tab row inside the
  Kunskap view: Kompetens and Minne duplicated the top-level tabs one
  row above; Regler & profil now renders inline under the graph with a
  section header (KnowledgeTabs.tsx deleted)
- Restore vertical rhythm (space-y-8) between the hero, detail section
  and footer, lost when the view moved into the settings tabs
- Update redirects and memory deep links (/settings/agent-memory,
  AgentChat memory chips, FactsCard manage link) to ?view=memory
- Match the loading skeleton to the new layout

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

components/agent-knowledge/AgentKnowledgePanel.tsx

@@ -60,11 +60,17 @@ export function AgentKnowledgePanel() {
   }
 
   if (!payload) {
+    // Mirrors the loaded layout: graph hero, section header, two profile cards.
     return (
-      <div className="space-y-6">
-        <Skeleton className="h-64 w-full rounded-xl" />
-        <Skeleton className="h-9 w-64" />
-        <Skeleton className="h-48 w-full rounded-xl" />
+      <div className="space-y-8">
+        <Skeleton className="h-96 w-full rounded-xl" />
+        <div className="space-y-4">
+          <Skeleton className="h-4 w-40" />
+          <div className="grid gap-4 md:grid-cols-2">
+            <Skeleton className="h-48 w-full rounded-lg" />
+            <Skeleton className="h-48 w-full rounded-lg" />
+          </div>
+        </div>
       </div>
     )
   }