refactor(direction): centralize last paragraph isRtl reads on helper (SD-2778)

Migrate the two remaining direct reads of attrs.direction/.dir on the
paragraph inline-direction axis onto getParagraphInlineDirection:

- layout-bridge/src/position-hit.ts: isRtlBlock
- layout-resolved/src/resolveParagraph.ts: isRtl

Behavior is unchanged on the typed directionContext path and strictly
broader on fallback (the helper also covers paragraphProperties.rightToLeft).
After this, no consumer outside the helper reads the legacy scalar fields;
a follow-up can stop pm-adapter from writing them and drop them from
ParagraphAttrs.

Author: caio-pizzol

packages/layout-engine/layout-bridge/src/position-hit.ts

@@ -23,7 +23,12 @@ import type {
   ParagraphBlock,
   ParagraphMeasure,
 } from '@superdoc/contracts';
-import { adjustAvailableWidthForTextIndent, computeLinePmRange, getFirstLineIndentOffset } from '@superdoc/contracts';
+import {
+  adjustAvailableWidthForTextIndent,
+  computeLinePmRange,
+  getFirstLineIndentOffset,
+  getParagraphInlineDirection,
+} from '@superdoc/contracts';
 import { charOffsetToPm, findCharacterAtX } from './text-measurement.js';
 import type { PageGeometryHelper } from './page-geometry-helper.js';
 
@@ -120,26 +125,9 @@ export const getAtomicPmRange = (fragment: AtomicFragment, block: FlowBlock): {
 
 export const isRtlBlock = (block: FlowBlock): boolean => {
   if (block.kind !== 'paragraph') return false;
-  const attrs = block.attrs as Record<string, unknown> | undefined;
-  if (!attrs) return false;
-  // AIDEV-NOTE: The typed directionContext.inlineDirection (SD-2776) is the source of
-  // truth for paragraph inline direction. Check the value, not the key — `inlineDirection`
-  // can be `undefined` per the resolver contract (no explicit w:bidi anywhere in the
-  // cascade), and we should fall through to the legacy field in that case.
   // Do NOT consult attrs.textDirection here: that's writing-mode (ECMA §17.18.93,
   // values lrTb/tbRl/btLr/lrTbV/tbRlV/tbLrV) which is a separate axis from inline RTL.
-  const directionContext = attrs.directionContext as { inlineDirection?: string } | undefined;
-  if (directionContext?.inlineDirection != null) {
-    return directionContext.inlineDirection === 'rtl';
-  }
-  // AIDEV-NOTE: compat-fallback — `attrs.direction` / `attrs.dir` are the legacy scalar
-  // duplicates of `directionContext.inlineDirection`. Retire once SD-2778 collapses
-  // them on `ParagraphAttrs`.
-  const directionAttr = attrs.direction ?? attrs.dir;
-  if (typeof directionAttr === 'string' && directionAttr.toLowerCase() === 'rtl') {
-    return true;
-  }
-  return false;
+  return getParagraphInlineDirection(block.attrs) === 'rtl';
 };
 
 export const determineColumn = (layout: Layout, fragmentX: number): number => {

packages/layout-engine/layout-resolved/src/resolveParagraph.ts

@@ -9,7 +9,7 @@ import type {
   ResolvedDropCapItem,
   ResolvedListMarkerItem,
 } from '@superdoc/contracts';
-import { adjustAvailableWidthForTextIndent } from '@superdoc/contracts';
+import { adjustAvailableWidthForTextIndent, getParagraphInlineDirection } from '@superdoc/contracts';
 import {
   isMinimalWordLayout,
   resolveListMarkerGeometry,
@@ -93,7 +93,7 @@ export function resolveParagraphContent(
   const paraIndent = (block.attrs as ParagraphAttrs | undefined)?.indent;
   const paraIndentLeft = paraIndent?.left ?? 0;
   const paraIndentRight = paraIndent?.right ?? 0;
-  const isRtl = (block.attrs as ParagraphAttrs | undefined)?.direction === 'rtl';
+  const isRtl = getParagraphInlineDirection(block.attrs) === 'rtl';
   const {
     anchorIndentPx: paraMarkerAnchorIndent,
     firstLinePx: markerFirstLine,