[Feature Request] Add "Manually Include Header" option to right-click context menu

[Alonglosef]

Description

We propose adding a "Manually Include Header" option to the right-click context menu in the IDE, which would provide a more intuitive and accurate way to include header files from the same project.

Proposed Solution

1. Add new right-click menu item:
   "Right-click on file → "Manually Include Header""
2. Trigger a native file browser dialog showing:
   • Only valid header files (.h/.hpp/.hh extensions)
   • Filtered view of headers within the same project directory structure
3. Auto-generate the correct include statement with either:
   • Relative path (for same-directory headers)
   • Project-relative path (for other cases)

// Example output in source file
 #include "subfolder/header.h" 

Benefits

• Reduces inclusion errors
• Eliminates manual path typing
• Maintains project directory structure awareness
• Faster than current manual methods

Additional Context

Suggested implementation locations:

• Right-click context in:
  • Source file editors (.cpp/.c)
  • Header file explorers
• Should respect project build system configurations

Acceptance Criteria

• File browser shows only valid header files
• Generated include statements follow project style guidelines
• Works with both relative and absolute path modes
• Supported in all file view contexts

[vs-code-engineering]

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