Upgrade icons, spacing, and default component themes

[bbovenzi]

Update our theme file for better component defaults:

• dialogs at "xl"
• buttons at "sm"
• table at "sm"
• checkbox at "sm" with "brand" colors

Our IconButton defaults to variant="ghost" so we can remove the manual props for that too

Also changed our Favorite Dag icons to use real outline and filled versions instead of manipulating the svg

Switched the table column filter from a sort icon to a real columns icon

Before:

After (rows are about 10px shorter)

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Was generative AI tooling used to co-author this PR?

• Yes (Claude Sonnet 4.6)

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• For fundamental code changes, an Airflow Improvement Proposal (AIP) is needed.
• When adding dependency, check compliance with the ASF 3rd Party License Policy.
• For significant user-facing changes create newsfragment: {pr_number}.significant.rst, in airflow-core/newsfragments. You can add this file in a follow-up commit after the PR is created so you know the PR number.

[vatsrahul1001]

@bbovenzi Do we need it in 3.2.2?

[bbovenzi]

@vatsrahul1001 There's no rush. This is all nice-to-have

[bbovenzi]

Updated to include tooltips in our IconButton to have a tooltip and use the tooltip instead of title.

Added other input elements to have a default size and colorPalette