fix(entitlements): gate remaining paid-feature UI, drop stale beta pricing copy (#921)

* fix(entitlements): gate remaining paid-feature UI and drop stale beta pricing copy

Second post-cutover sweep. Non-payers still hit live controls that 403 at
the server gate, plus dead plan names in the inbox guide:

- document-inbox guide: remove "Gratis under beta för Open-användare /
  Pro-planen / Se priser" (plans that no longer exist); inbox stays free,
  AI extraction is pitched as part of the subscription
- payslip send button (RunProgressBar): disabled + tooltip without
  email_send; the free PDF download next to it is untouched
- skattekonto "Synkronisera nu": disabled + tooltip without skatteverket
- invoice post-create send-now dialog: skipped without email_send (the
  invoice page's SendInvoiceDialog carries the upsell)
- recurring-invoice auto_send checkbox: disabled + UpgradeNote without
  email_send, and force-unchecked so edit mode can't PATCH it back on
- AgentChat composer: replaced with UpgradeNote without ai, covering
  deep links to /chat/* and conversations opened before expiry
- /onboarding/agent server page: hasCapability(ai) redirect to
  /settings/billing before the gated composer stream starts

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

* fix(entitlements): address review findings on the gating sweep

- AgentChat: the mount effect auto-fired the first /api/agent/invoke on a
  fresh start regardless of capability; now returns early without ai, and
  Regenerate/Correction re-invokes are guarded too (real find by review bot)
- recurring auto_send upsell copy moved to i18n (auto_send_requires_subscription,
  sv+en) matching the rest of the dialog
- disabled-button tooltips wrapped in a span (payslip send + skattekonto
  sync): browsers suppress title on disabled elements

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

messages/en.json

@@ -2754,6 +2754,7 @@
     "validation_min_one_row": "At least one row required",
     "send_hour_label": "Send at",
     "send_hour_hint": "Swedish time",
+    "auto_send_requires_subscription": "Automatic sending requires a subscription. Invoices are still created as drafts each period.",
     "auto_send_missing_email": "The customer has no email address. Add one to the customer to enable automatic sending."
   },
   "invoice_send_dialog": {
@@ -4546,6 +4547,7 @@
     "action_continue": "Continue",
     "action_book": "Post",
     "action_send_payslips": "Send payslips",
+    "payslips_send_requires_subscription": "Emailing payslips requires a subscription. Download the PDFs for free.",
     "action_send_payslips_again": "Send again",
     "action_download_payslips": "Download all",
     "action_download_agi": "Download AGI file (XML)",

messages/sv.json

@@ -2754,6 +2754,7 @@
     "validation_min_one_row": "Minst en rad krävs",
     "send_hour_label": "Skicka klockan",
     "send_hour_hint": "Svensk tid",
+    "auto_send_requires_subscription": "Automatiskt utskick kräver ett abonnemang. Fakturorna skapas ändå som utkast varje period.",
     "auto_send_missing_email": "Kunden saknar e-postadress. Lägg till en e-postadress på kundkortet för att kunna skicka automatiskt."
   },
   "invoice_send_dialog": {
@@ -4546,6 +4547,7 @@
     "action_continue": "Fortsätt",
     "action_book": "Bokför",
     "action_send_payslips": "Skicka lönebesked",
+    "payslips_send_requires_subscription": "Utskick av lönebesked via e-post kräver ett abonnemang. Ladda ner PDF:erna gratis.",
     "action_send_payslips_again": "Skicka igen",
     "action_download_payslips": "Ladda ner alla",
     "action_download_agi": "Ladda ner AGI-fil (XML)",