refactor(web): rely on QR panel containment

[lyzno1]

Summary

• remove the QR panel's redundant click-stopping handler
• rely on the existing document listener and ref.contains boundary
• remove the two suppressions required by the old non-interactive click handler
• prove that panel clicks bubble to business ancestors without closing the panel

Behavior contract

Outside clicks close the panel. Panel, canvas, scan-text, and download interactions remain inside the ref and keep it open. Internal clicks are no longer swallowed.

Visual regression review

There is no rendered-tree, class, focus, positioning, size, spacing, canvas, typography, tooltip, or light/dark change.

Verification

• owner suite: 8/8 passed
• new regression test fails while the redundant stopPropagation handler exists
• standalone a11y lint: 0 diagnostics
• full pnpm check: 0 errors
• suppression delta: -2
• diff check: passed

Dependency and rollback

Independent root layer. Revert it to restore the handler and its two suppressions together.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.43%. Comparing base (7522ae1) to head (f16de5e).
⚠️ Report is 14 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #40352      +/-   ##
==========================================
- Coverage   86.47%   86.43%   -0.05%     
==========================================
  Files        5264     5107     -157     
  Lines      294867   290738    -4129     
  Branches    59029    57924    -1105     
==========================================
- Hits       254976   251287    -3689     
+ Misses      34950    34510     -440     
  Partials     4941     4941              

Flag	Coverage Δ
cli	?
dify-ui	93.49% <ø> (ø)
web	86.11% <ø> (-0.01%)	⬇️

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