fix(a11y): Update extension button default_title to "OneNote Web Clipper"#633

Copilot wants to merge 2 commits intoclaude/issue-629-20260225-1056OneNoteDev/WebClipper:claude/issue-629-20260225-1056from

copilot/sub-pr-630OneNoteDev/WebClipper:copilot/sub-pr-630Copy head branch name to clipboard