fix(samples): correct text capitalisation on CC React App samples page (CAI-8463)

[mkesavan13]

COMPLETES #CAI-8463

This pull request addresses

Inconsistent capitalisation in copy text on the Contact Center Widgets samples page (`widgets-samples/cc/samples-cc-react-app/src/App.tsx`). Labels and headings used a mix of sentence-case and title-case, making the UI appear inconsistent.

by making the following changes

• `"Contact Center Widgets in a React app"` → `"Contact Center Widgets in a React App"` (consistent title-case for "App")
• `"Interaction preferences changes"` → `"Interaction Preferences Changes"` (title-case)
• `"Your interaction preference is updated"` → `"Your Interaction Preference Is Updated"` (title-case)
• `"Your access token: "` → `"Your Access Token: "` (title-case)

Change Type

• Bug fix (non-breaking change which fixes an issue)

The following scenarios were tested

• The testing is done with the amplify link
• Manual visual inspection of the affected text strings confirms correct title-case rendering.
• No logic changes; copy-only update to four string literals.

External Validation Required

AC	Requirement	Scope	Details
AC-1	The CC React sample app's pre-init UI copy (page heading, fieldset legends, control/field labels, and interaction toast copy) follows one consistent Title Case convention, eliminating the mixed-case outliers — the heading reads 'Contact Center Widgets in a React App' (matching the page <title>) and the token field label reads 'Your Access Token:'.	external	The sample app (widgets-samples/cc/samples-cc-react-app) has no unit-test harness (package.json scripts are tsc build, webpack, eslint only). The tsc compile gate proves type-validity but not copy casing. Consistency of the static string literals is verified by manual source inspection against the Title Case baseline and the public/index.html <title>.

Contract Discovery Warnings

• Manifest reference discovery capped at 100 strings

The GAI Coding Policy And Copyright Annotation Best Practices

• GAI was not used (or, no additional notation is required)
• Code was generated entirely by GAI
• Tool used for AI assistance (GitHub Copilot / Other - specify)
  • Other - Please Specify: Claude Code (Anthropic)
• This PR is related to
  • Defect fix

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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[bhabalan]

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