fix(shared-types): repair MDD tables glued to prose and headings

[OscarRubioSevilla]

Summary

• Expands collapsed pipe tables and splits prose, blockquotes, and headings from table headers in the MDD markdown pipeline.
• Fixes Workshop preview/render when pasting matrices like Trazabilidad BRD → MDD (FR → módulo → §§) that were glued on a single line.
• Adds regression tests for FR traceability matrix and glued heading/blockquote cases.

Test plan

• node --import tsx --test packages/shared-types/src/markdown-table.spec.ts packages/shared-types/src/repair-glued-headings.spec.ts
• Paste collapsed FR matrix in Workshop MDD editor and confirm table renders in preview
• Run Reformatear MDD on an affected document and verify matrix columns