docs: add JSDoc comments to E&A embed mode implementation

[saikumarvasa100-hash]

Related Ticket: #1929

Description of Changes

This PR adds comprehensive JSDoc documentation to the E&A (Explore and Analyze) embed mode implementation, as requested in issue #1929.

Files Updated:

1. atoms/embed.ts - Added file-level documentation and JSDoc comments for:

   • hydrateBoolean function
   • dehydrateBoolean function
   • isEmbeddedAtom export

2. atoms/center.ts - Added file-level documentation and JSDoc comments for:

   • DEFAULT_CENTER constant
   • hydrateCenter function
   • dehydrateCenter function
   • centerAtom export

3. atoms/zoom.ts - Added file-level documentation and JSDoc comments for:

   • DEFAULT_ZOOM constant
   • hydrateZoom function
   • dehydrateZoom function
   • zoomAtom export

4. embed-exploration.tsx - Added file-level documentation and JSDoc comments for:

   • Carto styled component
   • BaseTimelineContainer styled component
   • CompareTimelineContainer styled component
   • EmbeddedExplorationProps interface
   • EmbeddedExploration component
   • EmbeddedLayersExplorationProps interface
   • getDataLayer helper function
   • EmbeddedLayersExploration component

5. components/embed-exploration/embed-timeline.tsx - Added file-level documentation and JSDoc comments for:

   • TimelineWrapper styled component
   • EmbedTimelineProps interface
   • getCalendarView helper function
   • EmbedTimeline component

Notes & Questions About Changes

• All JSDoc comments follow standard JSDoc format with @fileoverview, @module, @param, @returns, @component, and @example tags where appropriate
• Interface properties are documented with inline JSDoc comments
• The documentation explains the purpose and functionality of each module in the context of the embed mode feature

Validation / Testing

• Documentation changes only - no functional changes to the code
• JSDoc comments can be verified by viewing the files in the diff

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