Open masked documents in the same tab instead of a…

Details

Clicking a masked document link (CV, posters, presentations) opened the
viewer in a new tab. Since the viewer already has a "Back" control and the
browser back button works, a new tab just clutters the user with extra
tabs. Navigate to the viewer in the same tab instead (via location.assign,
which keeps a history entry), so both the viewer's "Back" link and the
browser back button return to the page they came from.
- openMaskableDbLink always navigates in the same tab (window.open removed).
- maskDbAnchor strips target/rel from masked anchors so the native fallback
  also stays same-tab.
The viewer's "Open ↗" link still opens the raw document in a new tab — that
is the deliberate escape hatch when the inline preview can't render.
Verified offline (desktop + mobile): clicking CV opens the viewer in the
same tab (no new tab), and the browser back button returns to the main page
with the hero intact; full link audit still clean.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Pn8V4h9YWbjYzdSrDiLiVL

Files changed (1)