refactor: make mergeProps more efficient (at cost of mutating)

[Rathoz]

Summary

More efficient, but mutates. However many of the other functions in the same util also mutates the inputs.

Also fixes https://discord.com/channels/93055209017729024/372075546231832576/1503394166829224046

How did you test this change?

dev

[Copilot]

Pull request overview

This PR refactors ColumnUtil.mergeProps in the Table2 widget to avoid creating a separate merged props table, instead mutating the passed-in cell/header props for improved efficiency.

Changes:

• Refactored ColumnUtil.mergeProps to mutate cellProps and introduced a shared INHERITABLE_PROPS list.
• Updated Table2 Cell and CellHeader to rely on mutated props instead of a returned merged table.
• Simplified the call sites by removing the intermediate mergedProps variable.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
lua/wikis/commons/Widget/Table2/ColumnUtil.lua	Refactors prop merging to mutate input props and centralizes inheritable prop keys.
lua/wikis/commons/Widget/Table2/CellHeader.lua	Adjusts header rendering to use mutated props after merging.
lua/wikis/commons/Widget/Table2/Cell.lua	Adjusts cell rendering to use mutated props after merging.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[hjpalpha]

lgtm on phone