refactor(agent): keep the assistant in the nav, FAB and underlag flow only (#1557)

The founder wants the scattered per-page assistant buttons gone: the
assistant is reachable from the nav and the floating tab everywhere, so
in-page duplicates were noise. Removed the AgentSparkleButton call sites
(year-end, verifikat detail, supplier invoice detail, invoice editor)
and the now-orphaned component, the soft hand-off link in the Ny
verifikat modal (plus its i18n keys), and the transaction-row overflow
item. Kept: nav entry, floating tab, the Dokumentinkorg flow, and the
sanctioned "Skapa med assistent" split-button mode on /bookkeeping
(design.md convention 14).

The command palette's hand-off entries hardcoded the agent name "Anna";
they now use the identity from AgentSheetProvider like every other
affordance, and hide until agent onboarding is done (same gate as the
FAB).

Co-authored-by: Jakob Wennberg <311770904+jakobwennberg-oss@users.noreply.github.com>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

components/bookkeeping/NewJournalEntryDialog.tsx

@@ -1,7 +1,7 @@
 'use client'
 
 import { useTranslations } from 'next-intl'
-import { Copy, Loader2, MessageCircle } from 'lucide-react'
+import { Copy, Loader2 } from 'lucide-react'
 import {
   Dialog,
   DialogContent,
@@ -9,7 +9,6 @@ import {
   DialogTitle,
 } from '@/components/ui/dialog'
 import JournalEntryForm, { type FormLine } from '@/components/bookkeeping/JournalEntryForm'
-import { useAgentSheet } from '@/components/agent/AgentSheetProvider'
 
 export interface CopyPrefill {
   sourceId: string
@@ -43,7 +42,6 @@ export default function NewJournalEntryDialog({
   isLoading,
 }: Props) {
   const t = useTranslations('bookkeeping')
-  const { openAgentSheet, identity } = useAgentSheet()
 
   return (
     <Dialog open={open} onOpenChange={onOpenChange}>
@@ -63,24 +61,6 @@ export default function NewJournalEntryDialog({
           <DialogTitle>{t('new_entry_dialog_title')}</DialogTitle>
         </DialogHeader>
 
-        {identity.isVerified && !copyPrefill && (
-          // Hand off to the assistant: it reads the underlag (the figures the
-          // user often can't see), suggests accounts, and stages a balanced
-          // verifikat to approve: no copy-paste. Close the modal first so its
-          // focus trap doesn't fight the (non-modal) agent sheet.
-          <button
-            type="button"
-            onClick={() => {
-              onOpenChange(false)
-              openAgentSheet({ intentId: 'verifikation.draft', contextRef: 'verifikation:new' })
-            }}
-            className="inline-flex w-fit items-center gap-1.5 text-xs text-muted-foreground hover:text-foreground transition-colors"
-          >
-            <MessageCircle className="h-3.5 w-3.5" />
-            {t('ask_assistant_handoff')}
-          </button>
-        )}
-
         {isLoading ? (
           <div className="flex items-center justify-center gap-2 py-12 text-muted-foreground">
             <Loader2 className="h-4 w-4 animate-spin" />