Update Antd to v5.12+

[mahmed2000]

Closes #2359

See #2359 (comment) for additional context

• Some of the existing less variables did not have a clean mapping
• Some of the CSS selectors in styles/ant-overrides.scss need to be adjusted to match specificity.
• A number of things were changed that make things look very weird, like the global error modal. Padding, etc needs to be overridden.
• Its not completely clean, and computes the theme twice on the main page (on load to match admin and on Theme inserting into the DOM. But antd theming works at least.

Will make changes over time, but doable from here.

[cypress]

Passing run #17190 ↗︎

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Details:

Merge c57949d into 4c0233a...
Project: Owncast Web Frontend	Commit: 1c3d33e1b1 ℹ️
Status: Passed	Duration: 04:09 💡
Started: Jun 21, 2024 8:30 AM	Ended: Jun 21, 2024 8:34 AM

Review all test suite changes for PR #3780 ↗︎

[mahmed2000]

Storybook is going to be weird in general, as are embeds if I had to guess.

Most of the general global rules in the v4 less file have been moved to the .ant-layout class instead of body or html, which means those won't apply to most rules unless wrapped in a layout (like the page and not storybook/embeds) or they're set manually as global rules. Ideal situation would be wrap everything in at least the antd layout to maintain old consistency.

There's also discrepancies in, for example, the chromatic snaphot for "Custom Page Content" and the actual published storybook. It shows the link decorations but none are there in the actual storybook or the actual page.

Some of the mappings still need clarification. Hovers are weird. Most of them follow the --primary-hover-color which is blue, but some (like the active tab) follow the intended(?) light purple like v4.

[gabek]

I'm really impressed it's working as well as it is, nice job! We can certainly wrap layouts if that's what's needed.