Address truncation in interactive histogram X-axis ruler

[andersendsa]

Your checklist for this pull request

• I've read the guidelines for contributing to this repository.
• I made sure to follow the project's coding style.
• I've documented every RZ_API function and struct this PR changes.
• I've added tests that prove my changes are effective (required for changes to RZ_API).
• I've updated the Rizin book with the relevant information (if needed).
• I've used AI tools to generate fully or partially these code changes and I'm sure the changes are not copyrighted by somebody else.

Detailed description
The interactive horizontal histogram (p==) truncated the rightmost address offset on the X-axis ruler to a single character (e.g. 0 instead of 0x...) because max_room for the last label tick was constrained to data_cols - start_col.

This commit replaces the max_room calculation for the last tick so that it does not aggressively truncate the label, allowing the full address to be displayed correctly.

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Test plan

1. Build the project using ninja -C build.
2. Run rizin and view interactive histogram using p== <size>.
3. Notice that the last address on the x-axis ruler (bottom right) is no longer truncated and displays the full address representation (e.g. 0x1000 instead of 0).
4. Ensure the regression tests for histogram pass via ninja -C build test or specifically cd test && rz-test db/cmd/cmd_print.

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Closing issues
Closes:. #6550

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 49.90%. Comparing base (c351d5f) to head (e50f02f).
⚠️ Report is 16 commits behind head on dev.

Additional details and impacted files

Files with missing lines	Coverage Δ
librz/cons/histogram.c	69.59% <100.00%> (-0.36%)	⬇️

... and 40 files with indirect coverage changes

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[Rot127]

Add before and after screenshots please.

[andersendsa]

Add before and after screenshots please.

@Rot127
Before

After

[andersendsa]

Hi @Rot127 could you pls review the the pr and help me identify the changes that are needed ?

[wargio]

Add before and after screenshots please.

@Rot127 Before

After

i'm sorry. these images are identical.

[notxvilka]

That's definitely not an actual screenshot.