chore: initialize @limitless/ui git repo + add AppShell

This brings the long-untracked @limitless/ui source tree under version
control. Until now /srv/k8s/templates/limitless-ui has been a plain
file: dependency consumed by gscChronos / gscCRM / gscAdmin, with
copies scattered across web/gsc{Portal,WWW,Aether,Register}/ and
apps/gsc{Meet,Share}/. None were git-tracked.

Treating /srv/k8s/templates/limitless-ui as the canonical going
forward; secondary copies should be replaced with this version
in their consumers' Dockerfiles when they next get touched.

Changes in this initial commit beyond the snapshot:
- Add src/layout/AppShell.tsx — runtime-loaded chrome (header,
  sidebar, footer) backed by gsc-shell-api. Public surface:
    AppShell, ShellProvider, useShell, ShellConfig types
  Framework-agnostic (no Next.js dep). Apps pass appKey + apiUrl +
  getToken; AppShell composes the existing PageShell / Navbar /
  Sidebar / Footer primitives with API data.
- Re-export AppShell from src/index.ts.
- Fix build script: `tsc -p tsconfig.json --noEmit false`. The bare
  `tsc` command was a no-op because tsconfig.json sets noEmit:true
  for typecheck speed. Existing dist/ only existed because of an
  earlier emit; clean rebuilds were silently broken.

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

src/components/AdvancedSelect.tsx

@@ -0,0 +1,31 @@
+import React from 'react';
+import Select, { Props as SelectProps, GroupBase } from 'react-select';
+import Creatable from 'react-select/creatable';
+import Async from 'react-select/async';
+
+export type Option = { label: string; value: string };
+
+export type SelectSingleProps = SelectProps<Option, false, GroupBase<Option>>;
+export type SelectMultiProps = SelectProps<Option, true, GroupBase<Option>>;
+
+export function SelectSingle(props: SelectSingleProps) {
+  return <Select {...props} isMulti={false} />;
+}
+
+export function MultiSelect(props: SelectMultiProps) {
+  return <Select {...props} isMulti />;
+}
+
+export type CreatableSelectProps = SelectProps<Option, true, GroupBase<Option>>;
+
+export function TagsSelect(props: CreatableSelectProps) {
+  return <Creatable {...props} isMulti />;
+}
+
+export type AsyncSelectProps = React.ComponentProps<typeof Async<Option, false, GroupBase<Option>>> & {
+  isMulti?: boolean;
+};
+
+export function AsyncSelect(props: AsyncSelectProps) {
+  return <Async {...props} />;
+}