Migrate to @bsky.app/alf package (#9030)

* Add storybook shortcut in dev

* Migrate to alg pkg

* Migrate font_bold to new font_semi_bold

* Migrate font_heavy to font_bold

* Fix old theme refs

* Remove leading util

* Bump

* Revert "Add storybook shortcut in dev"

This reverts commit 7a86195c77fb5d449c7782e64ebabb6addfab919.

* Remove alf script

* Adjust font scale

* Bump

* Bump pkg

* Migrate values from conflicts

* Create default themes outside react

* Use built-in alf utils

* Migrate old font styles

* Remove unused tokens

* Move theme creation to more appropriate file

* Update button colors

* Adjust TextField colors, line heights

src/components/PostControls/ShareMenu/RecentChats.tsx

@@ -203,7 +203,7 @@ function NoConvos() {
           a.text_sm,
           t.atoms.text_contrast_high,
           a.text_center,
-          a.font_bold,
+          a.font_semi_bold,
         ]}>
         <Trans>Start a conversation, and it will appear here.</Trans>
       </Text>