SCIX-826 Render feedback menu items as links for new-tab support

[thostetler]

Feedback dropdown menu items used router.push() via onClick handlers,
which meant users could not Cmd+Click or right-click to open feedback
forms in a new tab. This forced users to lose their search results view
when navigating to feedback forms -- a problem when they need to
reference bibcodes from their results while filling out the form.

• Replaced MenuDropdown abstraction in FeedbackDropdown with direct Menu rendering using MenuItem as="a" with href attributes
• Feedback menu items now support Cmd+Click, Ctrl+Click, and right-click "Open in new tab"
• Regular click still navigates in same tab (unchanged UX for users who don't need new tab)
• Preserves the from query parameter for return navigation
• Fixed pre-existing bug where trailing ?/& chars were left in the from param after stripping
• Added tests

[codecov]

Codecov Report

❌ Patch coverage is 96.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 61.6%. Comparing base (908d3ec) to head (5975573).

Files with missing lines	Patch %	Lines
src/components/NavBar/FeedbackDropdown.tsx	96.0%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #798     +/-   ##
========================================
+ Coverage    61.6%   61.6%   +0.1%     
========================================
  Files         312     313      +1     
  Lines       35995   36087     +92     
  Branches     1593    1598      +5     
========================================
+ Hits        22141   22228     +87     
- Misses      13817   13822      +5     
  Partials       37      37             

Files with missing lines	Coverage Δ
src/components/NavBar/FeedbackDropdown.tsx	96.8% <96.0%> (ø)

... and 1 file with indirect coverage changes

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