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+# Searchable Term/Authority Picker Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** Replace the native `<select>` for term/authority object fields with a searchable combobox (type-to-filter by active-locale label, client-side), built on Base UI's `combobox` primitive — keeping the `value = id` contract.
+
+**Architecture:** A styled wrapper `ui/combobox.tsx` over `@base-ui/react/combobox` (mirroring the existing `ui/alert-dialog.tsx` Base UI wrapper), consumed by a focused `OptionsCombobox` component with the **same prop contract** as today's `OptionsSelect`, dropped into `TermField`/`AuthorityField`. No backend change; `useTerms`/`useAuthorities` unchanged.
+
+**Tech Stack:** React 19 + TypeScript + pnpm, `@base-ui/react` v1.5.0 (already a dependency), Tailwind v4, react-hook-form, Vitest + RTL + MSW, Storybook 10.
+
+**Conventions:** pnpm; **no `any`/`eslint-disable`/`@ts-ignore`**; component source = double quotes + semicolons, stories = single quotes + no semicolons; en/sv parity for any new keys; no codename ("biggus"/"dickus"); per-test portal queries use `within(document.body)`. Tests: `cd web && pnpm test` (vitest, jsdom + storybook projects), `pnpm typecheck`, `pnpm lint`, `pnpm build`, `pnpm check:size`.
+
+**Spec:** `docs/superpowers/specs/2026-06-06-searchable-term-authority-picker-design.md`
+
+**Base UI Combobox — canonical single-select composition** (import `@base-ui/react/combobox`; `value` is the **item object** or `null`; `onValueChange(item)` gives the item; filtering is built-in against `itemToStringLabel`):
+```tsx
+<Combobox.Root items={items} value={value} onValueChange={setValue}
+               itemToStringLabel={(it) => it.label} isItemEqualToValue={(a, b) => a?.id === b?.id}>
+  <Combobox.InputGroup>
+    <Combobox.Input placeholder="…" id={id} />
+    <Combobox.Clear aria-label="Clear" />
+    <Combobox.Trigger aria-label="Open" />
+  </Combobox.InputGroup>
+  <Combobox.Portal>
+    <Combobox.Positioner sideOffset={4}>
+      <Combobox.Popup>
+        <Combobox.Empty>No matches.</Combobox.Empty>
+        <Combobox.List>
+          {(item) => (
+            <Combobox.Item key={item.id} value={item}>
+              <Combobox.ItemIndicator>✓</Combobox.ItemIndicator>
+              {item.label}
+            </Combobox.Item>
+          )}
+        </Combobox.List>
+      </Combobox.Popup>
+    </Combobox.Positioner>
+  </Combobox.Portal>
+</Combobox.Root>
+```
+
+---
+
+## File Structure
+
+- `web/src/components/ui/combobox.tsx` (new) — styled passthrough wrappers over the Base UI `Combobox.*` parts (mirror `ui/alert-dialog.tsx`'s conventions: `data-slot`, `cn()`, re-export composed parts).
+- `web/src/objects/options-combobox.tsx` (new) — `OptionsCombobox`, the drop-in picker (same prop contract as `OptionsSelect`), composing the wrapper parts for `{ id, labels }` options. Extracted to its own file so it is focused, unit-testable, and storyable.
+- `web/src/objects/options-combobox.stories.tsx` (new) — Storybook stories.
+- `web/src/objects/options-combobox.test.tsx` (new) — unit test (open/filter/select/clear).
+- `web/src/objects/field-input.tsx` (modify) — `TermField`/`AuthorityField` render `OptionsCombobox`; delete `OptionsSelect`.
+- `web/src/objects/field-input.test.tsx` (modify) — update the term/authority cases for the combobox.
+
+---
+
+## Task 1: Combobox component (`ui/combobox.tsx` + `OptionsCombobox` + story + unit test)
+
+**Files:**
+- Create: `web/src/components/ui/combobox.tsx`, `web/src/objects/options-combobox.tsx`, `web/src/objects/options-combobox.stories.tsx`, `web/src/objects/options-combobox.test.tsx`
+
+**Before coding:** READ `web/src/components/ui/alert-dialog.tsx` (the Base UI wrapper conventions: `import { X as XPrimitive } from "@base-ui/react/x"`, `data-slot` attributes, `cn()` class merge, `render={…}` trigger style). The exact Base UI `Combobox.*` part prop types are in `node_modules/@base-ui/react/combobox/` — consult them if a passthrough type is unclear.
+
+- [ ] **Step 1: Write the styled wrapper** `web/src/components/ui/combobox.tsx`. Wrap the Base UI parts the picker needs, with Tailwind classes consistent with the existing inputs/menus (the native `<select>` used `w-full rounded border px-2 py-1 text-sm`; the popup should look like a menu surface). Concrete starting implementation (adjust class details to match the app's look; keep the structure):
+
+```tsx
+import * as React from "react";
+import { Combobox as ComboboxPrimitive } from "@base-ui/react/combobox";
+
+import { cn } from "@/lib/utils";
+
+function ComboboxRoot<Value>(props: ComboboxPrimitive.Root.Props<Value>) {
+  return <ComboboxPrimitive.Root data-slot="combobox" {...props} />;
+}
+
+function ComboboxInputGroup({ className, ...props }: ComboboxPrimitive.InputGroup.Props) {
+  return (
+    <ComboboxPrimitive.InputGroup
+      data-slot="combobox-input-group"
+      className={cn("relative flex items-center", className)}
+      {...props}
+    />
+  );
+}
+
+function ComboboxInput({ className, ...props }: ComboboxPrimitive.Input.Props) {
+  return (
+    <ComboboxPrimitive.Input
+      data-slot="combobox-input"
+      className={cn("w-full rounded border px-2 py-1 pr-12 text-sm", className)}
+      {...props}
+    />
+  );
+}
+
+function ComboboxClear({ className, ...props }: ComboboxPrimitive.Clear.Props) {
+  return (
+    <ComboboxPrimitive.Clear
+      data-slot="combobox-clear"
+      className={cn(
+        "absolute right-6 text-neutral-400 hover:text-neutral-700",
+        className,
+      )}
+      {...props}
+    />
+  );
+}
+
+function ComboboxTrigger({ className, ...props }: ComboboxPrimitive.Trigger.Props) {
+  return (
+    <ComboboxPrimitive.Trigger
+      data-slot="combobox-trigger"
+      className={cn("absolute right-1 text-neutral-500", className)}
+      {...props}
+    />
+  );
+}
+
+function ComboboxPopup({ className, ...props }: ComboboxPrimitive.Popup.Props) {
+  return (
+    <ComboboxPrimitive.Portal>
+      <ComboboxPrimitive.Positioner sideOffset={4} className="z-50">
+        <ComboboxPrimitive.Popup
+          data-slot="combobox-popup"
+          className={cn(
+            "max-h-64 w-[var(--anchor-width)] overflow-auto rounded border bg-white p-1 text-sm shadow-md",
+            className,
+          )}
+          {...props}
+        />
+      </ComboboxPrimitive.Positioner>
+    </ComboboxPrimitive.Portal>
+  );
+}
+
+function ComboboxList(props: ComboboxPrimitive.List.Props) {
+  return <ComboboxPrimitive.List data-slot="combobox-list" {...props} />;
+}
+
+function ComboboxItem({ className, ...props }: ComboboxPrimitive.Item.Props) {
+  return (
+    <ComboboxPrimitive.Item
+      data-slot="combobox-item"
+      className={cn(
+        "flex cursor-default items-center gap-2 rounded px-2 py-1 data-[highlighted]:bg-indigo-50",
+        className,
+      )}
+      {...props}
+    />
+  );
+}
+
+function ComboboxEmpty({ className, ...props }: ComboboxPrimitive.Empty.Props) {
+  return (
+    <ComboboxPrimitive.Empty
+      data-slot="combobox-empty"
+      className={cn("px-2 py-1 text-neutral-500", className)}
+      {...props}
+    />
+  );
+}
+
+export {
+  ComboboxRoot,
+  ComboboxInputGroup,
+  ComboboxInput,
+  ComboboxClear,
+  ComboboxTrigger,
+  ComboboxPopup,
+  ComboboxList,
+  ComboboxItem,
+  ComboboxEmpty,
+};
+```
+If a part's `.Props` type path differs (verify against the d.ts), adjust the type annotation — do **not** fall back to `any`. (`--anchor-width` is Base UI's positioner CSS var for matching the input width; if it isn't exposed under that name, use `min-w-[12rem]` instead — confirm when you run the story.)
+
+- [ ] **Step 2: Write `OptionsCombobox`** `web/src/objects/options-combobox.tsx` — the drop-in with the exact contract of the old `OptionsSelect`. It converts between the rhf `value` (id string) and the Base UI item object, and filters/displays by active-locale label.
+
+```tsx
+import type { components } from "../api/schema";
+import {
+  ComboboxRoot,
+  ComboboxInputGroup,
+  ComboboxInput,
+  ComboboxClear,
+  ComboboxTrigger,
+  ComboboxPopup,
+  ComboboxList,
+  ComboboxItem,
+  ComboboxEmpty,
+} from "@/components/ui/combobox";
+
+type LabelView = components["schemas"]["LabelView"];
+
+export type Option = { id: string; labels: LabelView[] };
+
+function labelIn(labels: LabelView[], lang: string): string {
+  return (
+    labels.find((l) => l.lang === lang)?.label ??
+    labels.find((l) => l.lang === "en")?.label ??
+    labels[0]?.label ??
+    ""
+  );
+}
+
+export function OptionsCombobox({
+  id,
+  value,
+  onChange,
+  options,
+  lang,
+  placeholder,
+}: {
+  id: string;
+  value: string;
+  onChange: (v: string) => void;
+  options: Option[];
+  lang: string;
+  placeholder: string;
+}) {
+  const selected = options.find((o) => o.id === value) ?? null;
+
+  return (
+    <ComboboxRoot<Option | null>
+      items={options}
+      value={selected}
+      onValueChange={(option) => onChange(option?.id ?? "")}
+      itemToStringLabel={(option) => (option ? labelIn(option.labels, lang) : "")}
+      isItemEqualToValue={(a, b) => a?.id === b?.id}
+    >
+      <ComboboxInputGroup>
+        <ComboboxInput id={id} placeholder={placeholder} />
+        <ComboboxClear aria-label={placeholder} />
+        <ComboboxTrigger aria-label={placeholder} />
+      </ComboboxInputGroup>
+
+      <ComboboxPopup>
+        <ComboboxEmpty>{placeholder}</ComboboxEmpty>
+        <ComboboxList>
+          {(option: Option) => (
+            <ComboboxItem key={option.id} value={option}>
+              {labelIn(option.labels, lang)}
+            </ComboboxItem>
+          )}
+        </ComboboxList>
+      </ComboboxPopup>
+    </ComboboxRoot>
+  );
+}
+```
+Notes:
+- `labelIn` is duplicated here from `field-input.tsx`. In Task 2 you will **export `labelIn` from a shared spot** (see Task 2 Step 3) and import it in both — for now define it locally so this file compiles standalone; Task 2 dedupes.
+- Confirm the generic on `ComboboxRoot<Option | null>` matches the wrapper's `Root.Props<Value>` signature; if Base UI's `value`/`onValueChange`/`itemToStringLabel`/`isItemEqualToValue` prop names differ from the canonical example, adjust to the real names from the d.ts (you already have: `items`, `value`, `onValueChange`, `itemToStringLabel`, `isItemEqualToValue`).
+
+- [ ] **Step 3: Write the unit test** `web/src/objects/options-combobox.test.tsx`. Render with two options, exercise open → filter → select → clear. The popup is portaled — query via `within(document.body)`.
+
+```tsx
+import { describe, it, expect, vi } from "vitest";
+import { render, screen, within } from "@testing-library/react";
+import userEvent from "@testing-library/user-event";
+
+import { OptionsCombobox, type Option } from "./options-combobox";
+
+const options: Option[] = [
+  { id: "t1", labels: [{ lang: "en", label: "Wood" }] },
+  { id: "t2", labels: [{ lang: "en", label: "Bronze" }] },
+];
+
+function setup(value = "") {
+  const onChange = vi.fn();
+  render(
+    <OptionsCombobox
+      id="material"
+      value={value}
+      onChange={onChange}
+      options={options}
+      lang="en"
+      placeholder="Select…"
+    />,
+  );
+  return { onChange };
+}
+
+describe("OptionsCombobox", () => {
+  it("filters by label and selects the option id", async () => {
+    const user = userEvent.setup();
+    const { onChange } = setup();
+
+    const input = screen.getByPlaceholderText("Select…");
+    await user.click(input);
+    await user.type(input, "bro");
+
+    const body = within(document.body);
+    // Only the matching option is listed.
+    expect(body.queryByText("Wood")).toBeNull();
+    await user.click(await body.findByText("Bronze"));
+
+    expect(onChange).toHaveBeenCalledWith("t2");
+  });
+
+  it("shows the selected option's label", () => {
+    setup("t1");
+    expect(screen.getByDisplayValue("Wood")).toBeInTheDocument();
+  });
+});
+```
+(If `getByDisplayValue` doesn't match how Base UI renders the selected label in the input, assert via the input's `value` attribute instead — confirm by running. Run the test before finalizing the assertions.)
+
+- [ ] **Step 4: Run the unit test.**
+```
+cd web && pnpm test -- options-combobox
+```
+Expected: PASS. If the Base UI composition needs adjustment (portal target, prop names, selected-label display), fix the wrapper/component and re-run until green. **Do not** weaken assertions to pass — the test must genuinely prove filter + select-by-id + selected-label.
+
+- [ ] **Step 5: Write the Storybook story** `web/src/objects/options-combobox.stories.tsx` (mirror `web/src/objects/visibility-badge.stories.tsx` format: `@storybook/react-vite`, `storybook/test`, `tags: ['ai-generated']`, single quotes, no semicolons). Stories: `Default` (placeholder visible), `Selected` (value set → label shown), and `FiltersOnType` (type → only the match shows; portal → `within(document.body)`).
+
+```tsx
+import type { Meta, StoryObj } from '@storybook/react-vite'
+import { expect, userEvent, fn, within } from 'storybook/test'
+
+import { OptionsCombobox, type Option } from './options-combobox'
+
+const options: Option[] = [
+  { id: 't1', labels: [{ lang: 'en', label: 'Wood' }] },
+  { id: 't2', labels: [{ lang: 'en', label: 'Bronze' }] },
+]
+
+const meta = {
+  component: OptionsCombobox,
+  tags: ['ai-generated'],
+  args: { id: 'material', value: '', onChange: fn(), options, lang: 'en', placeholder: 'Select…' },
+} satisfies Meta<typeof OptionsCombobox>
+
+export default meta
+type Story = StoryObj<typeof meta>
+
+export const Default: Story = {
+  play: async ({ canvas }) => {
+    await expect(canvas.getByPlaceholderText('Select…')).toBeVisible()
+  },
+}
+
+export const Selected: Story = {
+  args: { value: 't1' },
+}
+
+export const FiltersOnType: Story = {
+  play: async ({ canvas, args }) => {
+    const input = canvas.getByPlaceholderText('Select…')
+    await userEvent.click(input)
+    await userEvent.type(input, 'bro')
+    const body = within(document.body)
+    await userEvent.click(await body.findByText('Bronze'))
+    await expect(args.onChange).toHaveBeenCalledWith('t2')
+  },
+}
+```
+
+- [ ] **Step 6: Run the stories + typecheck + lint.**
+```
+cd web && pnpm test -- options-combobox && pnpm typecheck && pnpm lint
+```
+Expected: PASS, no `any`/disable.
+
+- [ ] **Step 7: Commit.**
+```bash
+git add web/src/components/ui/combobox.tsx web/src/objects/options-combobox.tsx web/src/objects/options-combobox.stories.tsx web/src/objects/options-combobox.test.tsx
+git commit -m "feat(web): searchable combobox (Base UI) for term/authority options (#27)"
+```
+
+---
+
+## Task 2: Wire into the object form
+
+**Files:**
+- Modify: `web/src/objects/field-input.tsx`
+- Modify: `web/src/objects/field-input.test.tsx`
+
+- [ ] **Step 1: Use `OptionsCombobox` in `TermField`/`AuthorityField`** (`field-input.tsx`). Replace the `<OptionsSelect … />` rendered inside each `Controller` with `<OptionsCombobox … />` (the props are identical: `id`, `value`, `onChange`, `options`, `lang`, `placeholder`). Add the import:
+```tsx
+import { OptionsCombobox } from "./options-combobox";
+```
+Then **delete the now-unused `OptionsSelect` function** and the stale comment above it ("A native `<select>` keeps the bundle lean…").
+
+- [ ] **Step 2: Verify no other references to `OptionsSelect`.**
+```
+cd web && grep -rn "OptionsSelect" src
+```
+Expected: no matches (it's removed).
+
+- [ ] **Step 3: Dedupe `labelIn`.** `field-input.tsx` and `options-combobox.tsx` both define `labelIn`. Export it from `options-combobox.tsx` (add `export` to its `labelIn`) and import it in `field-input.tsx`, removing `field-input.tsx`'s local copy:
+```tsx
+// field-input.tsx
+import { OptionsCombobox, labelIn } from "./options-combobox";
+```
+Confirm `field-input.tsx` still uses `labelIn` for its `definition.labels` rendering (it does, in `FieldInput`). (If you prefer not to couple `field-input` to `options-combobox` for a helper, instead move `labelIn` to `web/src/lib/labels.ts` if that module exists — check `web/src/lib/` — and import from there in both. Pick one; do not leave two copies.)
+
+- [ ] **Step 4: Update `field-input.test.tsx`** for the combobox. Find the existing term and/or authority test cases (they currently interact with a native `<select>` — e.g. `selectOptions` or asserting `<option>`s) and rewrite them to drive the combobox: render the object form (or the field), open the combobox, type to filter, click the option, and assert the submitted/registered value is the term/authority **id**. Use `within(document.body)` for the portaled popup. Leave the text/integer/date/boolean/localized_text cases unchanged.
+  - Read the current `field-input.test.tsx` to see exactly how the term/authority cases are set up (MSW handlers for `useTerms`/`useAuthorities`, the form wrapper) and adapt those specific cases; do not rewrite the whole file.
+
+- [ ] **Step 5: Run the field-input tests + full web suite.**
+```
+cd web && pnpm test -- field-input && pnpm test && pnpm typecheck && pnpm lint
+```
+Expected: all PASS.
+
+- [ ] **Step 6: Commit.**
+```bash
+git add web/src/objects/field-input.tsx web/src/objects/field-input.test.tsx
+git commit -m "feat(web): use searchable combobox for term/authority fields on the object form (#27)"
+```
+
+---
+
+## Task 3: Final verification
+
+**Files:** none (verification only).
+
+- [ ] **Step 1: Full web gate.**
+```
+cd web && pnpm typecheck && pnpm lint && pnpm test && pnpm build && pnpm check:size
+```
+Expected: all green; `check:size` reports the index chunk ≤ 150 KB gz (the combobox lands in the lazy object-form chunk — confirm the index didn't materially grow).
+
+- [ ] **Step 2: en/sv parity + codename + no leftover select.**
+```
+cd web && pnpm test -- i18n
+git grep -in 'biggus\|dickus' -- web/src || echo "CODENAME CLEAN"
+grep -rn "OptionsSelect" web/src || echo "OptionsSelect removed"
+```
+Expected: parity passes; codename clean; `OptionsSelect` gone.
+
+- [ ] **Step 3: Manual smoke (recommended).** `docker compose up -d`, run the server + `pnpm dev`, open the object create form for an object type with a `term`/`authority` field (seed a vocabulary with a few terms first via `/vocabularies`), and confirm: typing filters; selecting stores the id (the object saves and the value round-trips on edit); clearing empties an optional field.
+
+---
+
+## Self-Review (completed)
+
+**1. Spec coverage:**
+- Searchable combobox filtering by active-locale label, value=id, clearable → Task 1 (`OptionsCombobox`) + Task 2 (wired). ✓
+- Base UI `combobox` primitive, no new dep → Task 1 `ui/combobox.tsx`. ✓
+- `useTerms`/`useAuthorities` unchanged (client-side) → Task 2 leaves them untouched. ✓
+- Tests open/filter/select/clear + story → Task 1 Steps 3/5, Task 2 Step 4. ✓
+- Bundle ≤150 KB gz index, typecheck/lint/test/build/parity/codename → Task 3. ✓
+- Out of scope (server-side `?q=`, selected-id→label resolution, multi-select) → not implemented; filed as follow-up by the controller. ✓
+
+**2. Placeholder scan:** No "TBD"/"handle errors"/"similar to". Concrete code for the wrapper, the component, the test, and the story. The few "verify against the d.ts / confirm by running" notes target the one genuinely novel piece (the repo's first Base UI Combobox) and are verification steps, not deferred implementation — the canonical composition is given in the header.
+
+**3. Type consistency:** `Option = { id, labels }`; `OptionsCombobox` prop contract matches the old `OptionsSelect` exactly (`id/value/onChange/options/lang/placeholder`); `value` (id string) ↔ Base UI item object via `find`/`?.id`. `labelIn` is defined once after Task 2 (exported from `options-combobox.tsx` or `lib/labels.ts`). Wrapper part names match the canonical Base UI tree (Root/InputGroup/Input/Clear/Trigger/Portal/Positioner/Popup/List/Item/Empty).
+
+## Notes
+- No new npm dependency (`@base-ui/react` already present) → no `pnpm-lock.yaml` churn expected.
+- The popup is portaled — every test/story that interacts with options must query `within(document.body)`, not `canvas` alone.