feat(booking-templates): per-company opt-in hiding of system templates (#2004)

* feat(booking-templates): per-company opt-in hiding of system templates

Users cannot delete or hide the 26 standard konteringspaket, which clutter
the settings panel and every template picker. Deletion stays off the table
(shared global rows); instead a company can now hide individual system
templates for itself only.

- New booking_template_hidden table (insert=hide, delete=unhide), RLS gated
  on active company + write role; nothing hidden by default
- POST/DELETE /api/settings/booking-templates/[id]/hide (system templates
  only; company/team templates keep their real delete path)
- List route decorates rows with per-company is_hidden; pickers filter them
  out; the settings panel shows hidden ones in a collapsed restore section
  so hiding is never silent
- Classified in full-archive-export exclusions (UI preference, not
  rakenskapsinformation)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PU1KN431c9gp5zKvFaa1NL

* fix(booking-templates): idempotent re-hide, system-only RLS insert, hidden filter in bulk-book

Skeptic + CodeRabbit findings on #2004, one pass:

- hide upsert now passes ignoreDuplicates (DO NOTHING): the table has no
  UPDATE policy on purpose, so the DO UPDATE conflict arm turned a
  concurrent re-hide into an RLS 42501/500; pg test pins the conflict shape
- bth_insert policy additionally requires the referenced template to be an
  active system template (migration is unmerged, edited in place); negative
  pg test for company templates
- BulkBookDialog excludes templates hidden by the company (was reading the
  table directly and ignoring hides)
- panel shows the failure toast when the hide/unhide fetch itself rejects
- picker category chips built from the hidden-filtered list

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PU1KN431c9gp5zKvFaa1NL

---------

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

messages/en.json

@@ -2560,8 +2560,15 @@
     "create_dialog_title": "Create bookkeeping template",
     "empty_state": "No templates found.",
     "section_system": "Standard templates",
+    "section_hidden": "Hidden standard templates",
     "section_team": "Team templates",
     "section_company": "Company templates",
+    "hide": "Hide",
+    "unhide": "Show again",
+    "toast_hidden": "The template is hidden for this company",
+    "toast_unhidden": "The template is shown again",
+    "toast_hide_failed": "Could not hide the template",
+    "toast_unhide_failed": "Could not restore the template",
     "th_account": "Account",
     "th_description": "Description",
     "th_type": "Type",

messages/sv.json

@@ -2560,8 +2560,15 @@
     "create_dialog_title": "Skapa bokföringsmall",
     "empty_state": "Inga mallar hittades.",
     "section_system": "Standardmallar",
+    "section_hidden": "Dolda standardmallar",
     "section_team": "Teammallar",
     "section_company": "Företagsmallar",
+    "hide": "Dölj",
+    "unhide": "Visa igen",
+    "toast_hidden": "Mallen döljs för det här företaget",
+    "toast_unhidden": "Mallen visas igen",
+    "toast_hide_failed": "Kunde inte dölja mallen",
+    "toast_unhide_failed": "Kunde inte visa mallen igen",
     "th_account": "Konto",
     "th_description": "Beskrivning",
     "th_type": "Typ",