Lesson 6 cleanup

[jaygiang]

Lesson 6 Cleanup and Improvements

Changes Made

• Updated lesson title to better reflect content: "Computed Fields, Table Component, and Offline Detection"
• Streamlined Step 4 to focus on offline functionality testing using useOfflineStatus hook
• Removed PWA icons section and replaced with practical offline/online button testing
• Enhanced code examples with diff highlighting showing useOfflineStatus import and usage
• Improved explanations for data aggregation and Table component with clearer examples
• Added visual assets showing online/offline button states and table component
• Updated fish species in examples (Bluefin, Salmon) for better variety
• Made lesson more concise by removing verbose explanations while maintaining clarity

Key Improvements

• Students now see actual code patterns for offline detection
• Testing covers both development and production modes (npm run build + npm run serve)
• Clearer separation between UI logic and submission logic