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/text-input.tsx

@@ -0,0 +1,52 @@
+import * as React from 'react'
+import { Input } from './input'
+import { FieldLabel, FieldHint, FieldError } from './field'
+import { cn } from '@/lib/utils'
+
+/**
+ * TextInput — composite field: label + input + hint/error.
+ *
+ * Замена @nstart/ui TextInput (тот же API): label, hint, error, required.
+ * Внутри использует наш shadcn Input primitive.
+ */
+
+export type TextInputProps = Omit<React.InputHTMLAttributes<HTMLInputElement>, 'size'> & {
+  label?: React.ReactNode
+  hint?: React.ReactNode
+  error?: React.ReactNode
+  required?: boolean
+  /** Wrapper className (label + input + hint stack). */
+  rootClassName?: string
+}
+
+export const TextInput = React.forwardRef<HTMLInputElement, TextInputProps>(
+  function TextInput(
+    { label, hint, error, required, rootClassName, className, id, ...props },
+    ref,
+  ) {
+    const autoId = React.useId()
+    const inputId = id ?? autoId
+    const hintId = hint ? `${inputId}-hint` : undefined
+    const errorId = error ? `${inputId}-error` : undefined
+    return (
+      <div className={cn('flex flex-col gap-1', rootClassName)}>
+        {label && (
+          <FieldLabel htmlFor={inputId} required={required}>
+            {label}
+          </FieldLabel>
+        )}
+        <Input
+          ref={ref}
+          id={inputId}
+          aria-invalid={error ? true : undefined}
+          aria-describedby={[hintId, errorId].filter(Boolean).join(' ') || undefined}
+          className={cn(error ? 'border-pink focus-visible:ring-pink/40' : '', className)}
+          required={required}
+          {...props}
+        />
+        {hint && !error && <FieldHint id={hintId}>{hint}</FieldHint>}
+        {error && <FieldError id={errorId}>{error}</FieldError>}
+      </div>
+    )
+  },
+)