UI: Split CHANGELOG into user-facing bug fixes + generic Internal bump

Since 0.11.0 shipped with the Base UI 1.4.0 regressions, users do see
two bug fixes between 0.11.0 and the next release. Document them
explicitly:

- Bug Fix: restore focus-trap tabbability (cites #77381 + this PR).
- Bug Fix: remove transitive date-fns / @date-fns/tz peer dep
  (resolves #77395).
- Internal: keep the @base-ui/react 1.4.0 -> 1.4.1 bump as a generic
  line.

Made-with: Cursor

Author: ciampo

packages/ui/CHANGELOG.md

@@ -13,6 +13,8 @@
 ### Bug Fixes
 
 -   `Link`: Fix text decoration on the `unstyled` variant when `openInNewTab` is enabled, and simplify new-tab icon markup ([#77420](https://github.com/WordPress/gutenberg/pull/77420)).
+-   `Dialog`, `AlertDialog`, `Popover`, `Tooltip`, `Select`: Restore focus-trap tabbability through `ThemeProvider`'s `display: contents` wrapper ([#77381](https://github.com/WordPress/gutenberg/pull/77381), [#77520](https://github.com/WordPress/gutenberg/pull/77520)).
+-   Remove the transitive peer dependency on `date-fns` / `@date-fns/tz` ([#77520](https://github.com/WordPress/gutenberg/pull/77520)), resolving [#77395](https://github.com/WordPress/gutenberg/issues/77395).
 -   `CollapsibleCard`: Fix missing keyboard focus ring on the header chevron icon when rendered inside wp-admin ([#77468](https://github.com/WordPress/gutenberg/pull/77468)).
 -   `Tabs`: Fix missing keyboard focus ring on the panel in Windows High Contrast mode when rendered inside wp-admin ([#77469](https://github.com/WordPress/gutenberg/pull/77469)).
 
@@ -24,7 +26,7 @@
 
 ### Internal
 
--   Update `@base-ui/react` from `1.4.0` to [`1.4.1`](https://github.com/mui/base-ui/releases/tag/v1.4.1) ([#77520](https://github.com/WordPress/gutenberg/pull/77520)). Restores tabbability through `ThemeProvider`'s `display: contents` wrapper in `Dialog`, `AlertDialog`, `Popover`, `Tooltip`, and `Select`; and marks `date-fns` / `@date-fns/tz` as optional peer dependencies, resolving [#77395](https://github.com/WordPress/gutenberg/issues/77395).
+-   Update `@base-ui/react` from `1.4.0` to [`1.4.1`](https://github.com/mui/base-ui/releases/tag/v1.4.1) ([#77520](https://github.com/WordPress/gutenberg/pull/77520)).
 -   Extract shared `useScheduleValidation` hook; refactor `Dialog`, `Popover`, and `Tabs` validation contexts to use it ([#77165](https://github.com/WordPress/gutenberg/pull/77165)).
 -   `Tabs`: Wrap two validation timeout waits in `act(...)` to avoid intermittent test warnings ([#77319](https://github.com/WordPress/gutenberg/pull/77319)).