refactor: convert analytics context from string to enum

[VolodymyrBg]

What changed? Why?

• Added AnalyticsContext enum to replace string-based context values
• Updated CCAEventData type to use AnalyticsContext enum
• Renamed React context to AnalyticsReactContext to avoid naming conflicts
• Consolidated all known context values into a single enum
  These changes improve type safety by preventing typos in context values and make it easier to track all possible analytics contexts in one place. This resolves the TODO comment about converting context to enum.

Notes to reviewers

• The change is mostly type-level, with no runtime behavior changes
• All existing context string values have been preserved in the enum
• The enum is split into two sections: Navigation/UI contexts and Feature-specific contexts
• The React context was renamed to avoid naming collision with the new enum

How has it been tested?

• TypeScript compilation passes
• Existing usage of context values remains compatible through the enum values
• No runtime behavior changes as the string values remain the same
• Manual testing of analytics events confirms data is still logged correctly

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