Add M3 error pages and the Markdown mail theme

Error pages for 401 to 503 in an error-view root appended to view.paths,
with an inline fallback when the Vite build is missing, and a mail theme
rendered from the application's scheme JSON, with opt-in header and
message components. Completes Phase 9.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01V9NnLxnPp8vaaurb3Z1MFy

docs/plans/livewire-material.md

@@ -557,6 +557,20 @@ worktrees. What changed from the step above:
     `material-scheme.json` (falling back to the default scheme); `html/header` and
     `html/message` overrides; typescale on bare tags; filled primary button.
 
+**Steps 30–32 are done (2026-09-13).** Tables, sort headers and pagination were built in main; error
+pages and the mail theme by an agent in its own worktree. What changed from the steps above:
+
+- **The paginators are prepended to the `pagination` and `livewire` view namespaces** rather than
+  set as the default view, because Livewire sets its own default on every render; published
+  `vendor/pagination` and `vendor/livewire` views still win (`livewire-material.pagination`).
+- **The error-view root is `resources/views/error-pages`** (inside `views`, so an application's
+  `@source` line already covers its classes), appended to `view.paths` in `register()`, before the
+  view finder is built. The layout is `errors::minimal`, so the framework's 401 and 402 use it too.
+  Without a Vite build the pages fall back to an inline stylesheet from the scheme JSON. Testbench's
+  skeleton ships its own `errors/503`, which wins in the Workbench.
+- **Mail is light only**: the CSS inliner strips `@media`. The header and message components are
+  opt-in (`livewire-material.mail.components`) or published, because they change every Markdown mail.
+
 ### Phase 10 — `1.0.0`
 
 33. Showcase complete (every component, variant, colour, size and state, both themes); the