fix(cc-digital-channels): get-theme-value-from-store

[akulakum]

COMPLETES #https://jira-eng-sjc12.cisco.com/jira/browse/CAI-7624

This pull request addresses

The Digital Channels Widget was accepting currentTheme as a prop, requiring each consumer to pass the theme value explicitly. This was inconsistent with other store-managed values like dataCenter and jwtToken which are read directly from the store

by making the following changes

• Removed currentTheme prop from DigitalChannels component; now reads theme from store.currentTheme
• Added case-insensitive theme handling (e.g., 'dark', 'Dark', 'DARK' all work)
• Updated sample app to remove prop passing
• Added unit tests for case-insensitive theme values

Change Type

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Tooling change
• Internal code refactor

The following scenarios were tested

• The testing is done with the amplify link
  < ENUMERATE TESTS PERFORMED, WHETHER MANUAL OR AUTOMATED >

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• This PR is related to
  • Feature
  • Defect fix
  • Tech Debt
  • Automation

Checklist before merging

• I have not skipped any automated checks
• All existing and new tests passed
• I have updated the testing document
• I have tested the functionality with amplify link

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[akulakum]

@codex review

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[mkesavan13]

We should still be passing the theme prop to the Internal Digital Channels widget that is built by the WxEngage team, right?

[akulakum]

Yes, the theme is still being passed to DigitalChannelsComponent which renders the WxEngage Engage widget. The change is that instead of receiving currentTheme as a prop from the consumer, we now read it directly from store.currentTheme for consistency with other store-managed values like dataCenter and jwtToken.