feat: initial support for multi-column; lists and media fixes(Copy/paste project) (#2528)

* feat: initial support for multi-column; lists and media fixes

* fix: build error

* fix: address codex review comments

* fix: remove duplicated functions and improve html parsing

* test: add behavior tests for SuperDoc-to-SuperDoc copy-paste (SD-148)

- Copy-paste preserves inline formatting (bold)
- Copy-paste preserves list structure
- Cut removes content, paste restores it
- Pasted block identities are stripped (no duplicate paraId/sdBlockId)
- Copy-paste preserves images from multi-format document (PNG, JPG, BMP, GIF, TIFF)
- Image path collision triggers rename to avoid overwriting existing media

* test: add unit tests for clipboard embed/extract round-trip and slice paste guard (SD-148)

- embedSliceInHtml/extractSliceFromHtml/stripSliceFromHtml round-trip
- Unicode content round-trip (CJK, emoji)
- bodySectPr embed + extract round-trip
- extractSliceFromHtml returns null for plain HTML
- bodySectPrShouldEmbed with multi/single column
- shouldPreserveSlicePastedListRendering preserves freshly pasted list data
- non-slice paragraphs still get recalculated

---------

Co-authored-by: Caio Pizzol <caio@harbourshare.com>
Co-authored-by: Caio Pizzol <97641911+caio-pizzol@users.noreply.github.com>

Author: VladaHarbour

packages/layout-engine/style-engine/src/ooxml/index.ts

@@ -75,9 +75,7 @@ export function resolveRunProperties(
   if (!params.translatedLinkedStyles?.styles) {
     return inlineRpr ?? {};
   }
-  if (!inlineRpr) {
-    inlineRpr = {} as RunProperties;
-  }
+  inlineRpr = inlineRpr ? { ...inlineRpr } : ({} as RunProperties);
   // Getting properties from style
   const paragraphStyleId = resolvedPpr?.styleId as string | undefined;
   const paragraphStyleProps = resolveStyleChain('runProperties', params, paragraphStyleId) as RunProperties;
@@ -158,9 +156,7 @@ export function resolveParagraphProperties(
   inlineProps: ParagraphProperties | null | undefined,
   tableInfo: TableInfo | null | undefined,
 ): ParagraphProperties {
-  if (!inlineProps) {
-    inlineProps = {} as ParagraphProperties;
-  }
+  inlineProps = inlineProps ? { ...inlineProps } : ({} as ParagraphProperties);
   if (!params.translatedLinkedStyles?.styles) {
     return inlineProps;
   }

packages/super-editor/src/editors/v1/core/InputRule.d.ts

@@ -63,6 +63,8 @@ export function inputRulesPlugin(config: InputRulesPluginConfig): Plugin;
  */
 export function isWordHtml(html: string): boolean;
 
+export function isSuperdocOriginClipboardHtml(html: string | null | undefined): boolean;
+
 /**
  * Handle HTML paste events
  */