Merge branch 'main' into docs-remove-box-system-props

Author: siddharthkp

.changeset/angry-spoons-grin.md

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+---
+"@primer/react": patch
+---
+
+- Add a block prop for full width
+- Add alignContent prop to align content to center or start for full width buttons
+- Use control sizing CSS variable values (not using CSS vars just yet)
+- Use height over padding for more control over sizing
+- Adjust invisible button variant to match new design using ActionList colors
+

.changeset/blue-ads-hunt.md

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+---
+'@primer/react': minor
+---
+
+Issue a deprecation notice for UnderlineNav v1

.changeset/dull-lies-count.md

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+---
+"@primer/react": patch
+---
+
+TreeView: When moving focus to TreeView, the current item will be focused by default.

.changeset/few-deers-work.md

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+---
+'@primer/react': minor
+---
+
+Confine Heading as prop to header element types

.changeset/fifty-dolls-speak.md

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+---
+'@primer/react': patch
+---
+
+UnderlineNav2: Handle the case when container is too small to render any items

.changeset/gentle-queens-rest.md

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+---
+"@primer/react": patch
+---
+
+Add `aria-modal` attribute to `Dialog` (V2) element

.changeset/giant-games-leave.md

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+---
+"@primer/react": patch
+---
+
+Upgrade primer/behaviors from 1.3.1 to 1.3.2