[lexical-table] Bug Fix: Read background-color from shorthand style a…

[tomsarduy]

Description

$convertTableCellNodeElement only read style.backgroundColor when importing table cells from HTML, which misses the two most common ways Excel and some email encode cell background colors:

• style="background:#F4B084" — the CSS background shorthand. Browsers do compute this into style.backgroundColor on a live DOM, but on detached/fragment DOMs (as used by Lexical's paste engine) some parsers leave style.backgroundColor empty.
• bgcolor="#F4B084" — the legacy HTML attribute used by older Excel/Outlook versions.

The fix reads all three sources in priority order: style.backgroundColor || style.background || getAttribute('bgcolor').

Before

Pasting a table from Excel or some email clients with background color cells would lose all cell background colors. We use the editor in a ticketing system so there is a lot of copy/paste from Excel

After

• style.backgroundColor (explicit background-color:) — preserved ✓
• style.background shorthand — preserved ✓
• bgcolor HTML attribute — preserved ✓
• Unit tests added covering all four cases (including no background color → null)

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[hanselabreu]

Nice!

[meta-cla]

Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Meta Open Source project. Thanks!

[etrepum]

Do you intend to finish this one? It's marked as draft, although other than the conflicts it appears to be fairly complete