Add custom fields + warranty plugin, rework settings into two-pane shell

Feature work from the 2026-07 session:

Settings IA
- Replace the flat 27-card settings hub with a persistent two-pane shell
  (SettingsLayout.vue): grouped, searchable left rail + content pane.
- Nest all settings/* routes under the shell via router post-processing;
  shared nav catalog in settingsNav.js. Group by asset class (PCs, Printers,
  Equipment, Network) so per-type settings stop scattering.

Custom fields (core)
- customfields + customfieldvalues tables (migration 7d14), CRUD API at
  /api/customfields, per-asset value get/save.
- Settings management page + reusable CustomFieldsSection (detail) and
  CustomFieldsInputs (form) wired into all four asset types.

Warranty (new plugin)
- plugins/warranty: warranties + warrantyassets (migration 7d15), derived
  coverage status, provider abstraction (manual now; Dell/Lenovo/HP stubs).
- API CRUD + per-asset panel + report buckets; WarrantyPanel on all four
  detail pages; Warranties management page; Warranty report + Reports card.
- Seed warranty.* permissions.

Printer drivers
- printerdrivers table (migration 7d13) linked to printer models; drivers now
  surface on the matching printer's detail page.

Other
- PCDetail rebalanced (Network + Status + Warranty + custom fields on the right).
- Rename PCs list "Features" column to "Remote Access"; fix badge hover underline.
- Drop equipment islocationonly field.
- Centralize asset-type label/route maps into utils/assetTypes.js.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

sql/add_recertification_type.sql

@@ -0,0 +1,21 @@
+-- Recertification notification type (shopdb-flask)
+--
+-- Employee-photo type (blue, like recognition) for employees who must retake a
+-- training course. The shopfloor feed splits it one card per employee and the
+-- dashboard shows it in a blue "Recertification Required" carousel; the display
+-- window is two weeks (computed server-side in the notifications API).
+--
+-- Idempotent - safe to re-run. The notifications plugin also seeds this type on
+-- install (plugins/notifications/plugin.py); this file is for databases that
+-- already exist and are not re-installed.
+
+INSERT INTO notificationtypes (typename, typedescription, typecolor, isactive)
+SELECT * FROM (
+    SELECT 'Recertification' AS typename,
+           'Employees due to retake a training course (shows two weeks)' AS typedescription,
+           'recertification' AS typecolor,
+           1 AS isactive
+) AS t
+WHERE NOT EXISTS (
+    SELECT 1 FROM notificationtypes WHERE typename = 'Recertification'
+);

sql/widen_notification_employee_columns.sql

@@ -0,0 +1,10 @@
+-- Widen notifications.employeesso / employeename to TEXT.
+--
+-- Recognition and recertification notifications comma-join every listed
+-- employee's SSO and name into one column. VARCHAR(100) truncated the list at
+-- ~11 people, dropping names off the shopfloor grid. TEXT removes the cap.
+-- Idempotent - re-running MODIFY to the same type is a no-op.
+
+ALTER TABLE notifications
+    MODIFY employeesso TEXT,
+    MODIFY employeename TEXT;