fix(iconify): bootstrap Tabler icon set at runtime for @iconify/vue

The PrimeVue side of the parallel-mode app renders icons via
@iconify/vue's <Icon> component (src/components/Icon.vue). At runtime
@iconify/vue resolves an icon name like "tabler-eye" by looking up
its data in the in-memory icon registry; on a miss it falls back to
fetching https://api.iconify.design/tabler/eye.json. The CSP blocks
that origin, so every Tabler icon used in AppShell, SidebarHeader,
SidebarUserCard, and the migrated login form rendered as an empty
<svg viewBox="0 0 16 16"></svg>.

New plugins/iconify.ts loads the full Tabler set
(@iconify-json/tabler/icons.json, already in package.json as 1.2.23)
and registers it via addCollection() at module-load time. main.ts
side-effect-imports it before any other import so the registry is
warm before the first Icon mounts.

This is a NEW concern, separate from the existing plugins/iconify/
(index.ts + icons.css) which generates Vuexy-style i-tabler-* CSS
classes for Vuetify's VIcon adapter. The two systems must coexist
during F3–F6 parallel mode; the legacy directory can be deleted
alongside Vuetify when F6 lands.

Bundle cost: ~1.9 MB uncompressed JSON, ~400 KB gzipped in the main
chunk. Per-icon imports are a future optimisation.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/app/src/main.ts

@@ -1,3 +1,9 @@
+// Iconify-Tabler runtime data — side-effect import must run before any
+// component renders an Icon, so the @iconify/vue runtime resolves
+// names locally instead of falling back to the api.iconify.design CDN
+// (blocked by our CSP). See plugins/iconify.ts for the bootstrap.
+import '@/plugins/iconify'
+
 import { createApp } from 'vue'
 import { VueQueryPlugin } from '@tanstack/vue-query'
 import { queryClientConfig } from '@/lib/query-client'