Enhancement: global search tweaks

[shamoon]

Proposed change

Few things:

• Always show the search button (when theres text)
• Enter immediately runs advanced search, no need to wait for results
• Allow ctrl (⌘ for Mac) + click / Enter to open links (docs, filtering, etc) in a new tab
• Tiny bit of housekeeping

Closes #6648
See #6632 (comment)

Type of change

• Bug fix: non-breaking change which fixes an issue.
• New feature / Enhancement: non-breaking change which adds functionality. Please read the important note above.
• Breaking change: fix or feature that would cause existing functionality to not work as expected.
• Documentation only.
• Other. Please explain: change

Checklist:

• I have read & agree with the contributing guidelines.
• If applicable, I have included testing coverage for new code in this PR, for backend and / or front-end changes.
• If applicable, I have tested my code for new features & regressions on both mobile & desktop devices, using the latest version of major browsers.
• If applicable, I have checked that all tests pass, see documentation.
• I have run all pre-commit hooks, see documentation.
• I have made corresponding changes to the documentation as needed.
• I have checked my modifications for any breaking changes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.19%. Comparing base (7983487) to head (63d8734).

❗ Current head 63d8734 differs from pull request most recent head 9bdf1d8. Consider uploading reports for the commit 9bdf1d8 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #6674   +/-   ##
=======================================
  Coverage   97.19%   97.19%           
=======================================
  Files         436      436           
  Lines       17969    17975    +6     
  Branches     1526     1433   -93     
=======================================
+ Hits        17465    17471    +6     
- Misses        501      504    +3     
+ Partials        3        0    -3     

Flag	Coverage Δ
backend	95.88% <ø> (ø)
frontend	98.63% <100.00%> (+<0.01%)	⬆️

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