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>

app/(dashboard)/agent-knowledge/page.tsx

@@ -1,7 +1,8 @@
 import { redirect } from 'next/navigation'
 
-// "Vad din agent vet" moved into Settings (Assistenten -> Kunskap). This
-// route is kept as a permanent redirect so old links/bookmarks still resolve.
+// "Vad din agent vet" moved into Settings (Assistenten -> Kunskap, the default
+// view). This route is kept as a permanent redirect so old links/bookmarks
+// still resolve.
 export default function AgentKnowledgeRedirect() {
-  redirect('/settings/assistant?view=knowledge')
+  redirect('/settings/assistant')
 }

app/(dashboard)/settings/agent-memory/page.tsx

@@ -4,5 +4,5 @@ import { redirect } from 'next/navigation'
 // links (e.g. AgentChat's "what I remember" affordance) and old bookmarks land
 // in the right place.
 export default function AgentMemorySettingsPage() {
-  redirect('/settings/assistant')
+  redirect('/settings/assistant?view=memory')
 }