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/agent/AgentSparkleButton.tsx

@@ -1,62 +0,0 @@
-'use client'
-
-import { MessageCircle } from 'lucide-react'
-import { Button } from '@/components/ui/button'
-import { cn } from '@/lib/utils'
-import { useAgentSheet } from './AgentSheetProvider'
-
-interface Props {
-  intentId: string
-  // eslint-disable-next-line @typescript-eslint/no-explicit-any
-  intentArgs?: Record<string, any>
-  contextRef?: string
-  // Override the auto-derived "Fråga [namn]" label when the page wants
-  // something more contextual (e.g. "Förklara denna siffra"). Most surfaces
-  // should leave this unset.
-  label?: string
-  size?: 'sm' | 'default' | 'lg'
-  variant?: 'outline' | 'default' | 'ghost' | 'secondary'
-  className?: string
-}
-
-// Single source of truth for the in-page "Fråga [namn]" affordance. Every
-// page-header button across the dashboard (invoice form, supplier invoice,
-// bookkeeping, year-end, VAT report, KPI, …) routes through this component
-// so they share the same icon size, label format, spacing, and resolved
-// agent name. The transaction-row icon button stays separate: it's a
-// different UX (icon-only, ghost) embedded inside a row's action group.
-export default function AgentSparkleButton({
-  intentId,
-  intentArgs,
-  contextRef,
-  label,
-  size = 'sm',
-  variant = 'outline',
-  className,
-}: Props) {
-  const { openAgentSheet, identity } = useAgentSheet()
-  // Same gate as AgentTrigger: hide all "Fråga …" affordances until the
-  // user has finished /onboarding/agent.
-  if (!identity.isVerified) return null
-  const name = identity.displayName?.trim() || 'min assistent'
-  const resolvedLabel = label ?? `Fråga ${name}`
-
-  return (
-    <Button
-      type="button"
-      variant={variant}
-      size={size}
-      className={cn('shrink-0', className)}
-      onClick={() =>
-        openAgentSheet({
-          intentId,
-          intentArgs,
-          contextRef,
-        })
-      }
-    >
-      <MessageCircle className="mr-2 h-4 w-4" />
-      {resolvedLabel}
-    </Button>
-  )
-}