The InspectorHeader was missing shrink-0, allowing flex compression to
shrink it below the intended 52px. Also moved overflow-y-auto from the
aside to the content div so the header stays pinned while content
scrolls. Extracted refsMatchTargets() helper to reduce nesting depth
(Code Health 8.92 → 9.5).
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
