chore(ui): update Base UI to 1.8.0

[pasqualevitiello]

Summary

• update Base UI from 1.6.0 to 1.8.0
• support the third Combobox item generic and export createComboboxItems
• make Avatar image and fallback layering compatible with keepMounted
• update component documentation and generated registry artifacts

Validation

• bun install --frozen-lockfile
• bun test --pass-with-no-tests
• apps/ui and packages/ui lint
• focused Combobox createItems type-inference check
• registry dependency validation and build
• UI primitive sync

No changelog entry is included.

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Project	Deployment	Actions	Updated
coss-com	Ready	Preview	Sep 6, 2026 8:30am UTC
coss-com-origin	Ready	Preview	Sep 6, 2026 8:30am UTC
coss-com-ui	Ready	Preview	Sep 6, 2026 8:30am UTC
coss-examples-calcom	Ready	Preview	Sep 6, 2026 8:30am UTC

[github-actions]

Hey there and thank you for opening this pull request! 👋🏼

We require pull request titles to follow the Conventional Commits specification and it looks like your proposed title needs to be adjusted.

Details:

No release type found in pull request title "Update Base UI to 1.8.0". Add a prefix to indicate what kind of release this pull request corresponds to. For reference, see https://www.conventionalcommits.org/

Available types:
 - feat: A new feature
 - fix: A bug fix
 - docs: Documentation only changes
 - style: Changes that do not affect the meaning of the code (white-space, formatting, missing semi-colons, etc)
 - refactor: A code change that neither fixes a bug nor adds a feature
 - perf: A code change that improves performance
 - test: Adding missing tests or correcting existing tests
 - build: Changes that affect the build system or external dependencies (example scopes: gulp, broccoli, npm)
 - ci: Changes to our CI configuration files and scripts (example scopes: Travis, Circle, BrowserStack, SauceLabs)
 - chore: Other changes that don't modify src or test files
 - revert: Reverts a previous commit

[linear-code]

DES-210