feat: Call initThemes from useBaseComponent for one-theme support

[YueyingLu]

Description

Call initThemes in base components so it can support one-theme for vr-only artifact

Rest context Copied from cloudscape-design/component-toolkit#246 This PR has dependency on cloudscape-design/component-toolkit#246.

Problem

The vr-only artifact (setting ALWAYS_VISUAL_REFRESH=true) short-circuits useVisualRefresh to () => true, so useRuntimeVisualRefresh and initThemes() never run. This means the awsui-one-theme body class is never applied even when the global flag is set.

Solution

initThemes() now accepts an optional { skipVisualRefresh?: boolean } parameter. When true, it skips adding awsui-visual-refresh but still applies other theme.

The components package will call initThemes({ skipVisualRefresh: ALWAYS_VISUAL_REFRESH }) from useBaseComponent to ensure theme classes are applied regardless of the ALWAYS_VISUAL_REFRESH flag.

Test

Add unit test and will add integration test internally.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.66%. Comparing base (7f29935) to head (bd37642).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4894   +/-   ##
=======================================
  Coverage   97.66%   97.66%           
=======================================
  Files         958      958           
  Lines       31308    31314    +6     
  Branches    11563    11564    +1     
=======================================
+ Hits        30576    30582    +6     
  Misses        725      725           
  Partials        7        7           

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