Add ordered AND and OR syntax to all column filters

[arena-ai-coding-agent]

Summary

• Add shared case-insensitive filtering with ordered AND (* or &) and OR (|).
• Support repeated and mixed operators with AND taking precedence over OR, preserving literal spaces in phrases.
• Apply the same behavior to desktop and mobile column filters.
• Document syntax in filter tooltips and the README; add regression tests.

Validation

• node --test tests/filters.test.js — all 6 tests pass.
• git diff --check — passes.