docs: keep the search debounce

[funkadelic]

records keeping the search debounce, with typing-latency checks at two typing speeds

---

Summary by cubic

Records the decision to keep the 150 ms search debounce, backed by typing-latency measurements that show a React-transitions alternative was no faster.

• Adds ADR 0017 documenting the comparison and the decision; no search code changes.
• Adds latency specs typing a search term at 50 and 200 ms per key, with budgets for slowest key, blocking time, and time to settled results.
• Replaces the debounce-magnitude assertion on the existing search spec with a dead-probe check, so the test no longer pins the delay duration.

^{Written for commit 2be0a77. Summary will update on new commits.}

[codecov]

Bundle Report

Bundle size has no change ✅

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (db5396b) to head (2be0a77).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #141   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           51        51           
  Lines          778       778           
  Branches       155       155           
=========================================
  Hits           778       778           

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

[github-actions]

Lighthouse, median of 3 mobile runs

Page	Score	FCP	LCP	TBT	CLS	Speed Index
Cities	100	1.1s	1.4s	17ms	0.000	1.1s
Films	94	1.1s	3.0s	0ms	0.000	1.1s

Full reports

[codspeed]

Merging this PR will not alter performance

✅ 26 untouched benchmarks

---

_{Comparing docs/keep-search-debounce (2be0a77) with main (b1ed641)}

[cubic-dev-ai]

All reported issues were addressed across 4 files

<sub>Reply with feedback, questions, or to request a fix.

View guided diff | Turn on auto-fix | Re-trigger cubic</sub>

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud