Prefer markdown tables on paste

[makhnatkin]

Summary by Sourcery

Prefer pasting detected markdown content (currently tables) from text/plain data when available, instead of falling back to HTML clipboard content.

New Features:

• Add markdown detection utility that parses plain text clipboard content and identifies documents containing tables.
• Handle paste events by detecting markdown tables in text/plain clipboard data and inserting them as structured content when appropriate.

Tests:

• Add unit tests for markdown detection logic to distinguish markdown tables from plain text or raw HTML.
• Add integration-style test to verify that clipboard paste prefers markdown tables from text/plain over equivalent HTML table content.

[sourcery-ai]

Reviewer's Guide

Adds markdown-aware paste handling that prefers markdown tables from text/plain clipboard data over HTML, along with detection utilities and tests around table parsing.

File-Level Changes

Change	Details	Files
Introduce markdown detection during paste to prioritize markdown tables from text/plain clipboard data.	Import markdown detection helper into clipboard behavior module. Add early paste handler that checks text/plain clipboard content with the existing markdown parser. Skip markdown detection for YFM-formatted clipboard data and when inside code blocks. Parse detected markdown into a ProseMirror slice and dispatch a tracked paste transaction with additional metrics. Log a dedicated paste-detected-markdown event including the detection reason.	packages/editor/src/extensions/behavior/Clipboard/clipboard.ts
Add markdown detection utility that uses the existing parser to identify documents containing table nodes.	Define types for markdown detection reason and result to describe parser output and detection cause. Implement detectMarkdown helper that parses text and returns a structured result only when a table node is present. Implement a hasTableNode traversal that short-circuits once a table node is found, using shared table-utils helpers.	packages/editor/src/extensions/behavior/Clipboard/markdown-detect.ts
Add tests validating markdown table detection and clipboard behavior preference for markdown over HTML.	Set up a test schema and extensions that include base, markdown table, YFM table, and clipboard behavior. Add tests for detectMarkdown to ensure it detects markdown tables and ignores plain text and raw HTML input. Add an integration test that simulates a paste with both text/plain markdown table and text/html table, asserting that the resulting document matches the markdown-parsed table structure. Provide a helper for the expected table document structure used across tests.	packages/editor/src/extensions/behavior/Clipboard/markdown-detect.test.ts

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