refactor(direction): finish dropping attrs.direction (diff.ts + stale fixtures)

Follow-up to 19b13fc. Two gaps caught on review:

- layout-bridge/src/diff.ts:372 still compared a.direction !== b.direction
  inside paragraphAttrsEqual. Vitest passed because esbuild/swc skips
  cross-package types; the tsup DTS build was the one that caught it.
  Migrate to getParagraphInlineDirection(a) !== getParagraphInlineDirection(b)
  so the diff respects directionContext + paragraphProperties fallback.

- Test fixtures across versionSignature.test.ts, rtl-date-parity.test.ts,
  cache.test.ts, and diff.test.ts still constructed hand-rolled FlowBlocks
  with { direction: 'rtl' }. They typecheck via Record<string, unknown>
  casts but no longer model the actual ParagraphAttrs shape. Migrate
  them all onto directionContext.

Build sweep (contracts → pm-adapter → layout-bridge → layout-resolved
→ painter-dom) now passes; tests still green across all five.

Author: caio-pizzol

packages/layout-engine/layout-bridge/src/diff.ts

@@ -20,6 +20,7 @@ import type {
   DropCapDescriptor,
   ParagraphFrame,
 } from '@superdoc/contracts';
+import { getParagraphInlineDirection } from '@superdoc/contracts';
 import { fieldAnnotationKey } from './field-annotation-key.js';
 import { hashRunVisualMarks } from './run-visual-marks.js';
 import { hasTrackedChange, resolveTrackedChangesEnabled } from './tracked-changes-utils.js';
@@ -369,7 +370,7 @@ const paragraphAttrsEqual = (a?: ParagraphAttrs, b?: ParagraphAttrs): boolean =>
     a.tabIntervalTwips !== b.tabIntervalTwips ||
     a.keepNext !== b.keepNext ||
     a.keepLines !== b.keepLines ||
-    a.direction !== b.direction ||
+    getParagraphInlineDirection(a) !== getParagraphInlineDirection(b) ||
     a.floatAlignment !== b.floatAlignment
   ) {
     return false;

packages/layout-engine/layout-bridge/test/cache.test.ts

@@ -2065,7 +2065,7 @@ describe('MeasureCache', () => {
             { val: 'end', pos: 8640, leader: 'dot' },
           ],
           keepNext: true,
-          direction: 'ltr',
+          directionContext: { inlineDirection: 'ltr', writingMode: 'horizontal-tb' },
         };
 
         const block1 = paragraphWithAttrs('p1', 'Hello', complexAttrs);

packages/layout-engine/layout-bridge/test/diff.test.ts

@@ -434,8 +434,16 @@ describe('computeDirtyRegions', () => {
 
     describe('other paragraph attribute changes', () => {
       it('detects direction change', () => {
-        const prev = [paragraphWithAttrs('p1', 'Hello', { direction: 'ltr' })];
-        const next = [paragraphWithAttrs('p1', 'Hello', { direction: 'rtl' })];
+        const prev = [
+          paragraphWithAttrs('p1', 'Hello', {
+            directionContext: { inlineDirection: 'ltr', writingMode: 'horizontal-tb' },
+          }),
+        ];
+        const next = [
+          paragraphWithAttrs('p1', 'Hello', {
+            directionContext: { inlineDirection: 'rtl', writingMode: 'horizontal-tb' },
+          }),
+        ];
         const result = computeDirtyRegions(prev, next);
         expect(result.firstDirtyIndex).toBe(0);
       });
@@ -492,7 +500,7 @@ describe('computeDirtyRegions', () => {
             { val: 'end' as const, pos: 8640, leader: 'dot' as const },
           ],
           keepNext: true,
-          direction: 'ltr' as const,
+          directionContext: { inlineDirection: 'ltr' as const, writingMode: 'horizontal-tb' as const },
         };
         const prev = [paragraphWithAttrs('p1', 'Hello', complexAttrs)];
         const next = [paragraphWithAttrs('p1', 'Hello', complexAttrs)];

packages/layout-engine/layout-resolved/src/versionSignature.test.ts

@@ -33,7 +33,7 @@ describe('deriveBlockVersion - bidi', () => {
   const makeParagraph = (bidi?: TextRun['bidi']): FlowBlock => ({
     kind: 'paragraph',
     id: 'p1',
-    attrs: { direction: 'rtl' },
+    attrs: { directionContext: { inlineDirection: 'rtl', writingMode: 'horizontal-tb' } },
     runs: [
       {
         text: '23.03.2026',

packages/layout-engine/painters/dom/src/rtl-date-parity.test.ts

@@ -25,7 +25,7 @@ describe('RTL date parity', () => {
     const block: FlowBlock = {
       kind: 'paragraph',
       id: blockId,
-      attrs: { direction: 'rtl' },
+      attrs: { directionContext: { inlineDirection: 'rtl', writingMode: 'horizontal-tb' } },
       runs: [
         {
           text: runText,
@@ -54,7 +54,7 @@ describe('RTL date parity', () => {
     const block: FlowBlock = {
       kind: 'paragraph',
       id: blockId,
-      attrs: { direction: 'rtl' },
+      attrs: { directionContext: { inlineDirection: 'rtl', writingMode: 'horizontal-tb' } },
       runs: [{ text: runText, fontFamily: 'David, sans-serif', fontSize: 16, pmStart: 1, pmEnd: 7 }],
     };
 
@@ -78,7 +78,7 @@ describe('RTL date parity', () => {
     const block: FlowBlock = {
       kind: 'paragraph',
       id: blockId,
-      attrs: { direction: 'rtl' },
+      attrs: { directionContext: { inlineDirection: 'rtl', writingMode: 'horizontal-tb' } },
       runs: [
         { text: ltrText, fontFamily: 'David, sans-serif', fontSize: 16, pmStart: 1, pmEnd: 7 },
         { text: rtlText, fontFamily: 'David, sans-serif', fontSize: 16, bidi: { rtl: true }, pmStart: 7, pmEnd: 11 },
@@ -122,7 +122,7 @@ describe('RTL date parity', () => {
     const block: FlowBlock = {
       kind: 'paragraph',
       id: blockId,
-      attrs: { direction: 'rtl' },
+      attrs: { directionContext: { inlineDirection: 'rtl', writingMode: 'horizontal-tb' } },
       runs: [
         { text: runText, fontFamily: 'David, sans-serif', fontSize: 16, bidi: { rtl: true }, pmStart: 1, pmEnd: 5 },
       ],
@@ -147,7 +147,7 @@ describe('RTL date parity', () => {
     const block: FlowBlock = {
       kind: 'paragraph',
       id: blockId,
-      attrs: { direction: 'rtl' },
+      attrs: { directionContext: { inlineDirection: 'rtl', writingMode: 'horizontal-tb' } },
       runs: [{ text: runText, fontFamily: 'David, sans-serif', fontSize: 16, pmStart: 1, pmEnd: 12 }],
     };