feat(spec): declare defaultCollapsed / icon / description on record:details sections; withhold title (alias fork) and headerColor (dead-in-practice) (#11902)

* feat(spec): declare defaultCollapsed / icon / description on record:details sections

Three more section keys the renderer honours and the strict shape refused
(#11661, inheriting the #11289 ruling: declare what the renderer honours;
renderer unchanged). Optional, no schema defaults — the describe() texts
name the renderer-derived defaults, measured at the .objectui-sha pin
(190fbd01: DetailSection.tsx:139/516/546/520/557).

The same measurement's title and headerColor stay deliberately refused,
pinned by test: title is a second spelling of the declared heading slot
(alias fork held for a ruling); headerColor only reaches the DOM as a
template-literal Tailwind class that generates no CSS (dead-in-practice,
filed as objectui#6178).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Rxnd8cyFnoU8V5y21PaTsy

* docs(spec): regenerate ui/component reference for the #11661 section keys

check:generated proved exactly two artifacts stale; gen:docs wrote this page,
gen:api-surface regenerated byte-identical (the staleness was the reverse-
verification leg's restored src mtime vs dist, not a surface change).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Rxnd8cyFnoU8V5y21PaTsy

---------

Co-authored-by: Claude <noreply@anthropic.com>

Author: os-warren

.changeset/record-details-section-presentation-keys-11661.md

@@ -0,0 +1,5 @@
+---
+"@objectstack/spec": minor
+---
+
+Declare three more `record:details` section keys the renderer has honoured all along (#11661, inheriting the #11289 ruling): `defaultCollapsed` (start a `collapsible: true` section collapsed; renderer default expanded), `icon` (heading icon, lucide name; non-identifier values render as literal text) and `description` (plain-string sub-heading under the section heading). All three were refused by the strict section schema, so `objectstack validate` warned an authored key "did nothing" while the renderer read it. All three are optional with NO schema defaults — the fallbacks stay the renderer's. The same measurement's `title` and `headerColor` deliberately remain refused: `title` is a second spelling of the heading slot `label` declares (held for a declare-vs-converge ruling), and `headerColor` only reaches the DOM as a template-literal Tailwind class that generates no CSS (dead-in-practice; reported as an objectui finding).

content/docs/references/ui/component.mdx

@@ -539,7 +539,7 @@ const result = AIChatWindowProps.parse(data);
 | :--- | :--- | :--- | :--- |
 | **columns** | `Enum<'1' \| '2' \| '3' \| '4'>` | optional (default: `"2"`) | Number of columns for field layout (1-4) |
 | **layout** | `never` | optional | [REMOVED] `record:details` property `layout` was removed in @objectstack/spec 17.0.0 (#6946, ADR-0087 D2) — its declared `auto` \| `custom` semantics were never implemented: the renderer tests `layout` only against `inline` \| `compact`, two values the schema never permitted, so both legal values took the same branch and the key selected nothing. Delete the key — the body is already chosen by what you author: `sections` renders the explicit groups (the old `custom`), and omitting it falls back to the object's `highlightFields` (the old `auto`). Run `os migrate meta --from 16` to list the mechanical edits for existing sources; apply them by hand. |
-| **sections** | `{ name?: string; label?: string \| Record<string, string>; columns?: integer; fields: string[]; … }[]` | optional | Field groups rendered as the detail body, in order. Object form: `{ name?, label?, columns?, fields, hideEmpty?, collapsible?, showBorder? }`. |
+| **sections** | `{ name?: string; label?: string \| Record<string, string>; columns?: integer; fields: string[]; … }[]` | optional | Field groups rendered as the detail body, in order. Object form: `{ name?, label?, columns?, fields, hideEmpty?, collapsible?, showBorder?, defaultCollapsed?, icon?, description? }`. |
 | **fields** | `string[]` | optional | Explicit field list to display (optional, overrides highlightFields) |
 | **hideFields** | `string[]` | optional | Field names to omit from the body — applied to `fields` and to every section's `fields` (used to dedupe fields already shown in `record:highlights` or as the page title) |
 | **inlineEdit** | `boolean` | optional | Allow inline field editing in the detail body (renderer default: on, where the object itself is editable — set `false` to force it off). |

packages/spec/src/ui/component.test.ts

@@ -645,6 +645,94 @@ describe('RecordDetailsProps', () => {
     expect(message).toContain('`showBorders` → `showBorder`');
   });
 
+  // #11661 — three more section keys in exactly the pre-#11289 position
+  // (honoured by the renderer, refused by this shape), declared under the
+  // inherited ruling. Measured at the `.objectui-sha` pin (`190fbd01`):
+  // `defaultCollapsed` at `DetailSection.tsx:139`
+  // (`useState(section.defaultCollapsed ?? false)`), `icon` at
+  // `DetailSection.tsx:516/546`, `description` at `DetailSection.tsx:520/557`.
+  it('preserves the #11661 section keys verbatim', () => {
+    const result = RecordDetailsProps.parse({
+      sections: [{
+        label: 'Company',
+        fields: ['industry', 'website'],
+        collapsible: true,
+        defaultCollapsed: true,
+        icon: 'building-2',
+        description: 'Firmographics and reach',
+      }],
+    });
+    expect(result.sections?.[0].defaultCollapsed).toBe(true);
+    expect(result.sections?.[0].icon).toBe('building-2');
+    expect(result.sections?.[0].description).toBe('Firmographics and reach');
+  });
+
+  it('does not materialize the #11661 keys on a clean parse', () => {
+    // Same `maxVisible` principle as the #11289 trio: expanded / no icon / no
+    // sub-heading are the RENDERER'S fallbacks; a schema default would turn
+    // "the author said nothing" into "the author asked for the default".
+    const section = RecordDetailsProps.parse({
+      sections: [{ label: 'Overview', fields: ['name'] }],
+    }).sections?.[0] as Record<string, unknown>;
+    expect('defaultCollapsed' in section).toBe(false);
+    expect('icon' in section).toBe(false);
+    expect('description' in section).toBe(false);
+  });
+
+  it('rejects wrongly-typed values for the #11661 keys', () => {
+    for (const [key, value] of [
+      ['defaultCollapsed', 'yes'],
+      ['icon', 7],
+      ['description', ['two', 'lines']],
+    ] as const) {
+      const r = RecordDetailsProps.safeParse({
+        sections: [{ label: 'A', fields: ['a'], [key]: value }],
+      });
+      expect(r.success).toBe(false);
+      expect(r.success === false && r.error.issues[0].code).toBe('invalid_type');
+      expect(r.success === false && r.error.issues[0].path).toEqual(['sections', 0, key]);
+    }
+  });
+
+  it('still refuses unknown section keys after the #11661 widening', () => {
+    // The strict face survives, and the new keys entered the "did you mean"
+    // candidate list — the declaration reached the same error map the strict
+    // shape reads.
+    const r = RecordDetailsProps.safeParse({
+      sections: [{ label: 'A', fields: ['a'], defaultCollapse: true }],
+    });
+    expect(r.success).toBe(false);
+    const message = r.success === false
+      ? r.error.issues.map((i) => i.message).join('\n')
+      : '';
+    expect(message).toContain('`defaultCollapse` → `defaultCollapsed`');
+  });
+
+  it('still refuses the two keys #11661 deliberately withholds (`title`, `headerColor`)', () => {
+    // Both are honoured by the renderer at the pin, and both stay OUT of the
+    // accept set on purpose: `title` is a second spelling of the heading slot
+    // `label` declares (the `page:card` `body`-vs-`children` shape, which
+    // #5775 converged rather than declared) and is held for a maintainer
+    // ruling; `headerColor` reaches the DOM only as `bg-${...}`, a
+    // template-literal Tailwind class that generates no CSS under the v4
+    // source scan — dead-in-practice, so declaring it would advertise a
+    // capability the renderer does not deliver. A later batch declaring
+    // either must flip this pin consciously.
+    for (const [key, value] of [
+      ['title', 'Company'],
+      ['headerColor', 'muted'],
+    ] as const) {
+      const r = RecordDetailsProps.safeParse({
+        sections: [{ label: 'A', fields: ['a'], [key]: value }],
+      });
+      expect(r.success).toBe(false);
+      const message = r.success === false
+        ? r.error.issues.map((i) => i.message).join('\n')
+        : '';
+      expect(message).toContain(`\`${key}\``);
+    }
+  });
+
   it('preserves hideFields verbatim (sys-user.page.ts:106)', () => {
     // Undeclared until #5611, so a non-strict `z.object` dropped it on the
     // floor: the platform page's hidden-field list survived only because

packages/spec/src/ui/component.zod.ts

@@ -892,7 +892,34 @@ export const RecordDetailsProps = strictObject({
     collapsible: z.boolean().optional().describe('Render this section as a collapsible card — the heading becomes a chevron toggle, initially expanded (renderer default: off).'),
     /** Card chrome; the renderer derives it from the presence of a title. */
     showBorder: z.boolean().optional().describe('Draw this section\'s card chrome (renderer default: derived — on for a titled section, off for an untitled one). Set `false` for a borderless titled section, or `true` for a bordered untitled one.'),
-  })).optional().describe('Field groups rendered as the detail body, in order. Object form: `{ name?, label?, columns?, fields, hideEmpty?, collapsible?, showBorder? }`.'),
+    /**
+     * Three more section keys the renderer has honoured all along (#11661 —
+     * same defect class as #11289, inheriting its 2026-08-23 ruling WITH its
+     * reason: declare what the renderer honours; the renderer is unchanged).
+     * Optional with NO schema default, for the same `maxVisible` reason as the
+     * #11289 trio above; the defaults in the describe() texts are MEASURED at
+     * the `.objectui-sha` pin (`190fbd01`, objectui `plugin-detail/src/
+     * renderers/record-details.tsx` + `plugin-detail/src/DetailSection.tsx`).
+     *
+     * Two keys the same measurement found are deliberately NOT declared here
+     * (#11661 holds their forks):
+     * - `title` — the renderer's `s.title ?? s.label` limb is a second
+     *   spelling of the heading slot `label` already declares (identical
+     *   localization handling, zero producers). Same shape as the `page:card`
+     *   `body`-vs-`children` pair, which #5775 CONVERGED rather than declared
+     *   — one heading slot, not two de-facto contracts (Prime Directive #12).
+     *   Held for the maintainer's declare-vs-converge ruling.
+     * - `headerColor` — the renderer's only read is `bg-${headerColor}`, a
+     *   template-literal Tailwind class: Tailwind v4 scans source text with
+     *   no safelist, so this call site generates NO CSS and an authored value
+     *   works only when some other source file happens to use the same class
+     *   literally. Dead-in-practice at the pin (zero producers); declaring it
+     *   would advertise a capability the renderer does not deliver.
+     */
+    defaultCollapsed: z.boolean().optional().describe('Start a `collapsible: true` section collapsed (renderer default: expanded). Consulted only when `collapsible` is on — a non-collapsible section never reads its collapse state.'),
+    icon: z.string().optional().describe('Heading icon, as a lucide icon name (kebab-case, e.g. `building-2`). A value that is not an ASCII identifier (emoji, CJK text) renders as literal text beside the heading instead. Shown where the section heading renders: a titled section, or any collapsible section.'),
+    description: z.string().optional().describe('Sub-heading text rendered under the section heading (plain string — the renderer applies no translation to it, unlike `label`). Renders on a titled or collapsible section; a collapsible section hides it while collapsed.'),
+  })).optional().describe('Field groups rendered as the detail body, in order. Object form: `{ name?, label?, columns?, fields, hideEmpty?, collapsible?, showBorder?, defaultCollapsed?, icon?, description? }`.'),
   fields: z.array(z.string()).optional().describe('Explicit field list to display (optional, overrides highlightFields)'),
   /**
    * Field names to omit from the body, applied to both `fields` and every