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>

messages/en.json

@@ -192,8 +192,6 @@
     "source_user_taught": "You taught me",
     "source_agent_learned": "I noted",
     "source_derived": "Derived",
-    "tab_competence": "Competence",
-    "tab_memory": "Memory",
     "tab_config": "Rules & profile",
     "footer_basis": "Based on {entries} posted vouchers · updated {date}",
     "cp_title": "Booking patterns by counterparty",

messages/sv.json

@@ -192,8 +192,6 @@
     "source_user_taught": "Du lärde mig",
     "source_agent_learned": "Jag noterade",
     "source_derived": "Härlett",
-    "tab_competence": "Kompetens",
-    "tab_memory": "Minne",
     "tab_config": "Regler & profil",
     "footer_basis": "Baserat på {entries} bokförda verifikat · uppdaterad {date}",
     "cp_title": "Konteringsmönster per motpart",