H3 "###" header dont work or is not implemented

[jero98772]

when i put in the code ' ###' it is not displayed like normal markdown

    # H1 Work
    
    ## H2 work
    
    ### H3 (dont work or not implemented)
    
    #### H4 (dont work or not implemented))
    
    ##### H5 (dont work or not implemented))
    
    ####### H6 (dont work or not implemented))

[visit1985]

H3-H6 would need some different visual representation. We could borrow some from inline highlighting for H3 and H4, but I would not add additional colors to keep the sleek design.

[SH20RAJ]

Hi! I notice that PR #173 claims to fix this issue, but it's actually addressing a different problem (refactoring a condition in viewer.c) and doesn't implement H3-H6 header support as requested in this issue.

This issue is specifically about adding support for H3-H6 markdown headers (###, ####, #####, ######) which currently don't work in mdp. The requested feature would require:

1. Adding H3-H6 bit definitions to the parser
2. Implementing parsing logic for these header levels
3. Adding visual styling for H3-H6 headers in the viewer

I have actually implemented a proper fix for this issue with:

• Full H3-H6 header parsing support
• Different visual styling for each header level (dim, standout, reverse, italic)
• Proper line length calculation
• Test files to verify functionality

The implementation follows @visit1985's suggestion to use different visual representations without adding new colors. However, I'm unable to create a new PR since the current PR #173 is using the same branch name but addressing a completely different issue.

Would it be possible to either:

1. Close/rename PR Fix issue #169: Refactor ugly condition in inline_display function #173 since it doesn't actually fix this issue, or
2. Allow me to create a new PR with the actual H3-H6 header implementation?

The H3-H6 header feature is definitely implementable and I have a working solution ready to contribute.