feat(web): W3-1 shared console routes, nav, api/sse/query-keys and shared components

- routes.ts registers all workspaces under /console (+ detail routes, engine, audit, login)
- api.ts: cookie session first (credentials include, CSRF header), Bearer only with stored key, 401 -> /login
- sse.ts: shared EventSource with ?after=seq catch-up, backoff reconnect, per-type subscribe
- shared components: data-table, filter-bar, detail-sheet, timeline, json-view, confirm-dialog,
  form-field, kv-list, stat-tile, error/loading states; ui tabs and textarea

Co-Authored-By: Claude Opus 5.5 <[email protected]>

apps/web/app/components/ui/textarea.tsx

@@ -0,0 +1,20 @@
+import type * as React from "react";
+
+import { cn } from "~/lib/utils.ts";
+
+function Textarea({ className, ...props }: React.ComponentProps<"textarea">) {
+  return (
+    <textarea
+      data-slot="textarea"
+      className={cn(
+        "placeholder:text-muted-foreground dark:bg-input/30 border-input flex min-h-16 w-full min-w-0 rounded-md border bg-transparent px-3 py-2 text-base shadow-xs transition-[color,box-shadow] outline-none disabled:cursor-not-allowed disabled:opacity-50 md:text-sm",
+        "focus-visible:border-ring focus-visible:ring-ring/50 focus-visible:ring-[3px]",
+        "aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 aria-invalid:border-destructive",
+        className,
+      )}
+      {...props}
+    />
+  );
+}
+
+export { Textarea };