Reorganize hello world guide for better learning flow

[oblomov-dev]

Summary

Restructured the "Hello World" documentation to improve the learning progression by introducing core concepts earlier and reorganizing code examples for better clarity.

Key Changes

• Moved "How Apps Work" section earlier: Introduced the thin-frontend model, key principles, and the z2ui5_if_app interface before diving into code examples, giving readers essential context upfront
• Reorganized code progression: Reordered sections so "View Display" comes before "Events", allowing readers to understand basic rendering before handling interactions
• Improved code formatting: Enhanced indentation and formatting consistency across all code examples for better readability
• Refined explanatory text:
  • Changed "Let's add a view to show some text" to "Instead of a message box, let's render a view with some text" for better context
  • Simplified "The framework calls the main method..." explanation
  • Updated "To distinguish between lifecycle events" to "Use the lifecycle checks to tell these phases apart"
  • Clarified dispatcher behavior: "Each check_* method returns abap_true only for its own phase, so the IF/ELSEIF chain acts as a dispatcher"
• Consolidated redundant content: Removed duplicate explanations that appeared in both the "Info" section and earlier in the guide
• Converted CASE/WHEN to IF/ELSEIF: Updated the final code example to use more idiomatic conditional structure
• Cleaned up formatting: Removed extra blank lines at the end of the document

Notable Details

The reorganization maintains all technical content while improving the pedagogical flow—readers now understand the framework's architecture before seeing implementation details, making the code examples more meaningful.

https://claude.ai/code/session_01D25MmQa34TSgtUXQZWjw4o