fix: table section tags should implicitly close other table sections

[vimzh]

Opening a <thead>, <tbody>, or <tfoot> should auto-close any currently open table section. This wasn't working for two reasons:

1. <tfoot> was missing from tableSectionTags, so <tbody> after <tfoot> (or <tfoot> after <tfoot>) would nest instead of being siblings.
2. <thead> had no entry in the openImpliesClose map at all, so <thead> after <tbody> would also nest incorrectly.

On top of that, the set also needed tr, td, and th because those elements sit above the section tag on the stack. The openImpliesClose mechanism only peels from the top, so it needs to be able to close through the row and cell elements to reach the section tag underneath.

For <table><tfoot><tr><td>F<tbody><tr><td>B</table>:

• Before: <tbody> nested inside <tfoot> > <tr> > <td>
• After: <tfoot> and <tbody> are siblings under <table>, matching browser/spec behavior

Verified against parse5 (spec-compliant reference parser) for all combinations of section tag ordering.

Ref: https://html.spec.whatwg.org/multipage/syntax.html#optional-tags

[fb55]

Thanks @vimzh!

[vimzh]

Hi! I pushed a fix for the TypeScript lint failure the : [string] tuple annotations on the mock.calls.findIndex destructuring were incompatible with vitest's any[][] typing. All checks should be green now. It looks like I accidentally pushed the code and it disabled auto-merge, really sorry about this I'm new to open source hope you understand, thanks.