refactor(bench): unify benchmarks list and fix best-pick selection

[spetz]

The dual-mode sidebar (Version vs Recent) bred a cascade of
routing bugs, and the hero picked a year-old run because
max_by(throughput) had no time window.

Collapse the two scopes into one /api/recent-backed list where
hardware and gitref are plain filter dropdowns, AND-combined with
kind chips, sort, search, and param ranges. No scope state means
no race conditions: the sidebar fetches once, URL is authoritative.

Hero showcase now uses latest_sweep, which groups by
(hardware, gitref) of the newest-timestamp run and ranks by lowest
P99 → P99.9 → P99.99 → highest throughput (NaN-safe). While
loading, a branded pulsing Iggy mark replaces placeholder copy.
Gitref pill links to apache/iggy at that commit, both on the
landing and the detail title. A top-bar share button copies the
current URL so users don't grab the address bar.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 19.36%. Comparing base (572b5ba) to head (e7bf114).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@              Coverage Diff              @@
##             master    #3146       +/-   ##
=============================================
- Coverage     73.27%   19.36%   -53.92%     
  Complexity      943      943               
=============================================
  Files          1126     1124        -2     
  Lines         98435    87640    -10795     
  Branches      75611    64816    -10795     
=============================================
- Hits          72128    16970    -55158     
- Misses        23700    70279    +46579     
+ Partials       2607      391     -2216     

Components	Coverage Δ
Rust Core	0.35% <ø> (-73.80%)	⬇️
Java SDK	62.30% <ø> (ø)
C# SDK	69.40% <ø> (ø)
Python SDK	81.43% <ø> (ø)
Node SDK	91.53% <ø> (ø)
Go SDK	39.41% <ø> (ø)
see 623 files with indirect coverage changes

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