fix(docx): resolve basedOn style chains

[developer0hye]

Summary

• Resolve DOCX paragraph and character style w:basedOn chains transitively within the same style type.
• Preserve document-default, parent, child, and direct-formatting precedence while handling missing parents, cross-type parents, cycles, and declaration order deterministically.
• Restore the inherited centered alignment of the Place your event title here.docx #1219 fixture's ALL, AGES, WELCOME, and gate text, with fresh two-page visual evidence.

Related issue

Fixes #1453

Testing

• TDD red: CARGO_TARGET_DIR=/Users/yhkwon/Documents/office2pdf/target cargo test -p office2pdf --lib test_based_on_chain_inherits_parent_paragraph_and_run_properties -- --nocapture failed before the implementation because inherited center alignment was None.
• CARGO_TARGET_DIR=/Users/yhkwon/Documents/office2pdf/target cargo test -p office2pdf --lib parser::docx::tests::style_tests -- --nocapture (51 passed)
• CARGO_TARGET_DIR=/Users/yhkwon/Documents/office2pdf/target cargo test --workspace (all workspace, fixture, integration, and doc tests passed)
• CARGO_TARGET_DIR=/Users/yhkwon/Documents/office2pdf/target cargo clippy --workspace --all-targets -- -D warnings
• CARGO_TARGET_DIR=/Users/yhkwon/Documents/office2pdf/target cargo check --target wasm32-unknown-unknown -p office2pdf
• CARGO_TARGET_DIR=/Users/yhkwon/Documents/office2pdf/target cargo check --target wasm32-unknown-unknown -p office2pdf --features wasm
• CARGO_TARGET_DIR=/Users/yhkwon/Documents/office2pdf/target cargo check --target wasm32-unknown-unknown -p office2pdf --features wasm-cjk-font
• python3 -m unittest discover -s scripts/tests -p 'test_*.py' (275 passed)
• cargo fmt --all -- --check
• git diff --check
• python3 scripts/compare_layout.py gt.pdf after.pdf --json --audit (expected nonzero; all remaining findings dispositioned to DOCX missing-font selection changes table wrapping and placement across hosts #1409 and DOCX table cells do not break overlong Latin tokens at character boundaries #1454, with zero painted-visibility mismatches)
• python3 scripts/compare_text_layer.py gt.pdf after.pdf --json (census identical; normalized content differs only because GT breaks WELCOME as WELC / OME, tracked in DOCX table cells do not break overlong Latin tokens at character boundaries #1454)
• python3 scripts/compare_render.py --page 1 --dpi 300 --audit --lines --artifacts-dir ... gt.pdf after.pdf and page 2 equivalent (expected nonzero; all remaining clusters dispositioned to DOCX missing-font selection changes table wrapping and placement across hosts #1409 and DOCX table cells do not break overlong Latin tokens at character boundaries #1454)
• Documentation freshness audit: PASS

Visual impact

• No rendered PDF change
• Rendered PDF change or visual evidence added
• Reason: inherited center alignment moves the page-1 right-cell heading and gate runs horizontally to the reference anchors.

Visual audit

• Issue: DOCX basedOn style chains are ignored, dropping inherited alignment and formatting #1453
• Fixture: Issue Place your event title here.docx #1219 attachment Place your event title here.docx
• Page(s): 1-2
• Renderer and DPI: pdftoppm, 300 DPI inspection; stored progressive JPEG evidence at 150 DPI
• Evidence mode: fix
• Layout audit report: assets/bugfixes/issue-1453/layout-audit.json
• Layout audit page count: Pass
• Layout audit text flow: DOCX missing-font selection changes table wrapping and placement across hosts #1409, DOCX table cells do not break overlong Latin tokens at character boundaries #1454
• Layout audit large shifts: DOCX missing-font selection changes table wrapping and placement across hosts #1409, DOCX table cells do not break overlong Latin tokens at character boundaries #1454
• New follow-up issues found in this audit: DOCX table cells do not break overlong Latin tokens at character boundaries #1454
• Model vision findings: Full-page GT/output renders, 5% pixel diffs, and matched 300 DPI crops show ALL, AGES, and GATES OPEN AT 9AM moving from left alignment to the right cell's horizontal center; their remaining x deltas are 1.77pt, 0.39pt, and 0.02pt. Page 1 visually hides Sensitivity: Internal behind the artwork and the strengthened layout audit reports zero visibility mismatches on both pages. The rotated photo, orange diamond, blue and pink panels, dot fields, white circle, triangles, diagonal separators, and three vertical rules retain their position, size, rotation, fill, and stroke. The still-unbroken and overflowing WELCOME line and the resulting vertical stack are DOCX table cells do not break overlong Latin tokens at character boundaries #1454; title/subtitle/RSVP font family, weight, width, and metric differences are DOCX missing-font selection changes table wrapping and placement across hosts #1409.
• GT: assets/bugfixes/issue-1453/gt.jpg
• Before: assets/bugfixes/issue-1453/before.jpg
• After: assets/bugfixes/issue-1453/after.jpg

Visual comparison

GT	Before	After

Required inspection

• Rendered all evidence at 150 DPI or higher
• Stored progressive JPEG quality 86 assets with metadata stripped
• Used Codex/Claude vision to inspect the full GT/output pages, diff, and matched crops
• Inspected matched region crops at full resolution
• Ran compare_layout.py --audit and dispositioned every large text-instance shift and painted-visibility mismatch
• Ran the 5% fuzz pixel-difference sweep
• Inventoried hairlines and border dash styles
• Inventoried font weight, italic, and underline emphasis

Deviation audit

Check	Result
Page count/order	Matches GT: two pages in the same order, with the RSVP page second
Element presence	Remaining: #1454 tracks GT's WELC / OME lines versus the output's single WELCOME line; all source elements remain present
Position/size	Remaining: #1454 tracks the page-1 vertical stack caused by the missing line; #1409 tracks subtitle and RSVP metric shifts; #1453 fixes the right-cell horizontal anchors
Rotation/flip	Matches GT: the rotated photo and transformed decorations keep their orientation
Fill	Matches GT: the blue/pink panels and solid decorations retain their colors and coverage
Stroke/border	Matches GT: the white circle, three outlined triangles, diagonal separators, yellow diamond, and three vertical rules retain their high-DPI hairline strokes; there are no dashed borders
Shape outline geometry	Matches GT: crops show the diamond, circle, triangles, polygon boundaries, dot fields, photo bounds, and vertical bars unchanged
Text content	Remaining: #1454 tracks the hard line break in GT's WELC / OME; the codepoint-class census otherwise matches and both footer instances remain extractable
Font family/weight/style	Remaining: #1409 tracks host-dependent title/body/RSVP font family, weight, and width metrics; bold emphasis remains present, with no italic or underlined runs
Text color	Matches GT: all text remains black on both pages
Alignment	Remaining: #1454 tracks centering of the two resulting WELCOME lines after wrapping; #1453 fixes the inherited center alignment for every current right-cell line
Line/paragraph spacing	Remaining: #1454 tracks the missing WELCOME line and resulting vertical cell distribution; #1409 tracks subtitle and RSVP font-metric offsets
Clipping/overflow	Remaining: #1454 tracks the single overflowing WELCOME line; the page-1 footer is correctly clipped/occluded and now reports zero visibility mismatches

Checklist

• Commits include a Signed-off-by line
• PR scope contains one root cause
• Remaining visual deviations each reference an open issue