feat: add search and advanced filters to query history

[AlishaMansuri110]

Description

Added Search and Advanced Filters to Query History.

Features added:

• Search history by language and code keywords
• Language filter dropdown
• Issue count filter (0, 1–5, 5+)
• Real-time filtering without page reload
• Supports combining search and filters
• Works with existing sorting and pagination

Related Issue

Fixes #1638

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 (if frontend change)

Test evidence

Manual testing completed:

• Search by language works
• Search by code keyword works
• Language filter works
• Issue count filter works
• Combined filtering works
• Sorting and pagination continue to work