feat(debugging): complete finding suppression workflow

[Komal2008]

Description

Implemented finding suppression support for debugging results.

This PR adds frontend and backend support for suppressing individual debugging findings. Suppressed findings are removed from the active debug view, persisted in the backend, and covered with automated tests. The changelog has also been updated.

Related Issue

Fixes #671

Type of change

• Bug fix
• New feature / enhancement
• Documentation update
• Test addition
• Refactor

Checklist

• I have read CONTRIBUTING.md
• My branch is up to date with main
• I have run pytest -v and all tests pass
• I have not introduced duplicate issues or features
• My PR title follows the format: feat/fix/docs/test: short description
• I have added tests for new features (Level 2 and 3 issues)
• No hardcoded secrets or API keys in my code
• This PR is linked to a GSSoC 2026 issue

Screenshots (frontend change)

Before

After

''''''

''''''

''''''

Test evidence

pytest -v

============================= test session starts =============================
...
441 passed, 116 warnings in 34.61s