feat(ccwidgets): Real Time Transcript Widget Implementation

[Kesari3008]

COMPLETES #https://jira-eng-sjc12.cisco.com/jira/browse/WXCC-13856

This pull request addresses

by making the following changes

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

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  • Defect fix
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• 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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[chatgpt-codex-connector]

Persist transcript tab selection on tab click

The tab buttons only invoke onTabChange and never update any internal state, while activeTab is defaulted to 'live'. In the default widget flow (TaskTranscript + useTaskTranscript), this means clicking “IVR transcript” does not actually switch the rendered content unless the host app builds its own controlled-state loop; for typical usage (especially plain web-component embedding), the IVR tab is effectively unusable.

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