feat(ui): drop @nstart/ui dependency (Stage 3.9)

Все font cascade bugs из последних MR были вызваны @nstart/ui pollution
(Tektur inheritance от Card parent'ов, Onest font в Button, font-primary
class overrides). Решили обрезать раньше plan'а.

What changed:

New primitives (8 файлов в src/ui/components/):
  - panel.tsx           — container с border/surface
  - field.tsx           — FieldLabel/Hint/Error typography helpers
  - text-input.tsx      — Input + label/hint/error composite
  - table.tsx           — Table/TableHeader/Body/Row/HeaderCell/Cell/Empty
  - date-picker.tsx     — native <input type=date> wrapper с label/hint/error
  - multi-select.tsx    — Radix Popover + inline checkboxes
  - single-select.tsx   — native <select> с label/hint/error chrome
  - language-switch.tsx — segmented control в Tektur uppercase

Compatibility shims (existing components extended):
  - checkbox.tsx        — + label/description/error/onChange (nstart-compat
                          synthetic event), wrap в <label> когда есть chrome
  - modal.tsx           — + panelClassName / bodyClassName props
  - form-actions.tsx    — + align prop (start/end/between)
  - tabs-simple.tsx     — TabItem.count alias for .trailing (nstart-compat)
  - table TableHead     — alias TableHeaderCell с align prop

Barrel rewrite (src/ui/index.ts):
  - Удалён 'export * from @nstart/ui'
  - Explicit exports для всех 45+ нужных символов
  - SelectOption / MultiSelectOption / LanguageOption теперь {id, label}
    с optional 'value' alias — nstart-compat без массового codemod call-sites

styles.css cleanup:
  - Removed @import @nstart/ui/styles/{fonts,theme}.css
  - Removed @source nstart/dist directive (Tailwind v4 scan)
  - Removed --text-sm: 13px override (был костыль для @nstart/ui dist)
  - Legacy color tokens (--color-carbon/ultramarain/orbit/regolith/asteroid)
    sсодержали fallback mappings — оставлены, но callsites больше не используют

Codemod: 9 файлов конвертированы legacy colors → handoff tokens
  carbon → ink, ultramarain → accent, orbit → warn, regolith → line, asteroid → mute

main.tsx:
  - NStartUiProvider → TooltipProvider (Radix)
  - DatePickerProvider убран (наш DatePicker native, no provider needed)

routes/dictionaries.$name.tsx:
  - Removed useRef-based <input>.indeterminate hack
  - Radix Checkbox принимает checked='indeterminate' declaratively

package.json: -@nstart/ui (was 0.1.3)

Bundle impact:
  before: vendor-nstart-ui chunk = 1228 KB
  after:  no nstart chunk, всё в vendor-misc (+~70 KB Radix wrappers)
  net savings: ~1.15 MB minified, ~440 KB gzip

Tests: 116 pass (1 fixed: tab role from 'button' → 'tab', Radix semantically correct).
TS strict: clean.
Browser-verified (preview): 7 utilities computed correctly, nstart bundle absent.

ordinis-admin-ui/src/ui/components/field.tsx

@@ -0,0 +1,49 @@
+import * as React from 'react'
+import { cn } from '@/lib/utils'
+
+/**
+ * FieldLabel / FieldHint / FieldError — typography primitives для form fields.
+ * Замена @nstart/ui (без логики, чистые atomic spans/divs).
+ *
+ * <p>Per handoff: label = text-body (13/400), hint/error = text-cell (12.5).
+ */
+
+export type FieldLabelProps = React.LabelHTMLAttributes<HTMLLabelElement> & {
+  required?: boolean
+}
+
+export const FieldLabel = React.forwardRef<HTMLLabelElement, FieldLabelProps>(
+  function FieldLabel({ className, required, children, ...props }, ref) {
+    return (
+      <label
+        ref={ref}
+        className={cn(
+          'inline-flex items-baseline gap-0.5 text-body font-medium text-ink',
+          className,
+        )}
+        {...props}
+      >
+        {children}
+        {required && (
+          <span aria-hidden="true" className="text-pink">
+            *
+          </span>
+        )}
+      </label>
+    )
+  },
+)
+
+export function FieldHint({ className, ...props }: React.HTMLAttributes<HTMLParagraphElement>) {
+  return <p className={cn('text-cell text-mute', className)} {...props} />
+}
+
+export function FieldError({ className, ...props }: React.HTMLAttributes<HTMLParagraphElement>) {
+  return (
+    <p
+      role="alert"
+      className={cn('text-cell text-pink', className)}
+      {...props}
+    />
+  )
+}