Refactor large modules into focused submodules (300-line ceiling)

[kevincarlson]

Summary

This PR splits several large modules across the codebase to comply with the 300-line file ceiling convention. The changes are primarily structural refactoring—extracting cohesive functionality into dedicated submodules without altering behavior or APIs.

Key Changes

Layout Engine (loki-layout)

• flow.rs: Extracted table and column logic into dedicated submodules:

  • flow_balance.rs — column-height balancing for multi-column layouts
  • flow_table_cells.rs — per-cell block flowing and padding
  • flow_table_geom.rs — cell-height measurement and grid-column assignment
  • flow_table_paint.rs — row-height measurement and cell decoration emission
  • flow_list_marker.rs — list marker layout
  • flow_page_fields.rs — PAGE/NUMPAGES field detection and substitution

• para.rs: Extracted paragraph-level utilities:

  • para_tabs.rs — tab-stop resolution and leader fills
  • para_query.rs — read-only geometry queries (hit-test, line-end offset)
  • para_props_map.rs — model property mapping
  • para_underlays.rs — selection-geometry underlays
  • para_emit.rs — glyph run emission (expanded with rotation support)

• New modules: options.rs, result_rotation.rs, flow_widow_orphan.rs, incremental_notes.rs, revision_style.rs, paginate_blanks.rs, table_shading.rs

Document Model (loki-doc-model)

• document.rs: Extracted document_paper.rs for paper-size utilities

• style/: Added focused modules:

  • page_style.rs — named page style definitions
  • table_banding.rs — pure table-style conditional formatting resolver
  • resolve_table.rs — table-specific style resolution

• loro_mutation/: Extracted mutation operations into dedicated modules:

  • page.rs — page-layout mutations (orientation)
  • page_style.rs — per-page-style geometry edits
  • table_ops.rs — structural table mutations (insert/delete rows/columns)
  • para_mark.rs — paragraph-mark tracked deletion
  • revision.rs — tracked-change CRDT mutations
  • align.rs — paragraph alignment mutations
  • text_containers.rs — text container mutations
  • block_edit.rs — block-level edits

• content/: Added:

  • revision_ops.rs — accept/reject of tracked changes
  • toc.rs — table-of-contents handling
  • para_mark_merge.rs — paragraph-mark merge logic

ODF/ODT (loki-odf)

• odt/reader/document.rs: Extracted frame and table parsing:

  • document_frame.rs — draw:frame and frame-kind parsing
  • document_table.rs — table parsing

• odt/mapper/: Extracted style and document mapping:

  • styles_tests.rs — stylesheet mapper tests
  • document/sections.rs — section mapping
  • document/page.rs — page-style mapping (expanded)

• odt/write/: Added page-style and table-style writers:

  • page_styles.rs — page-style serialization
  • revisions.rs — tracked-change serialization
  • table_style.rs — table-style serialization

OOXML/DOCX (loki-ooxml)

• docx/mapper/: Extracted property and document mapping:
  • props_rpr.rs — run-property mapping
  • document_cols.rs — column mapping
  • `table

https://claude.ai/code/session_01A5ufvex8RV1yUo1x42FJXL