refactor(web): redesign Issue detail page to closely match Linear
- Properties sidebar: remove uppercase header, interactive hover rows,
right-aligned values, no divider lines between items
- Content area: wider left padding (px-12), max-width 720px for
readability, issue key above title, proper separator before activity
- Activity: lowercase "Activity" heading, comments rendered without
border box (inline text), tighter avatar sizing
- Breadcrumb: sticky header bar
- Comment input: hover border effect
- Overall: 13-14px body text, proper line-height, tracking-tight title
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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