feat: Remove FID, replace first interaction detection with INP

[ptang-nr]

First Input Delay (FID) has been deprecated and replaced by Interaction To Next Paint (INP). PageViewTiming events for first interactions are preserved by detecting the first INP event and will no longer output value for the firstInputDelay attribute. For more info on PageViewTiming, see https://docs.newrelic.com/docs/browser/new-relic-browser/page-load-timing-resources/pageviewtiming-async-or-dynamic-page-details/. For more info on INP and the FID deprecation, see https://web.dev/articles/inp.

Overview

In this PR, we are proceeding with the removal of FID related logic from the browser agent.

Notes:

The firstInteraction timing event should continue to be detected as-is, with the following differences:

• the firstInputDelay attribute will no longer be generated
• value is emitted when visibilityChange = hidden
• dropped support in Firefox due to INP being yet to be supported
• interactionType values:

Previous values	To-be values
keyup, keydown	keyboard
pointerup, pointerdown, click	pointer

Supported in Chrome, Edge, and Android. Not supported on Firefox, Safari and iOS (see PerformanceEventTming browser compatibility)

Related Issue(s)

https://new-relic.atlassian.net/browse/NR-365650

Testing

Updated existing tests that dealt with FID.
Added unit tests for first interaction.
Manually tested

• Detection of first input on Chrome
• No first input detected when page is opened in background on Chrome

[github-actions]

Asset Size Report

Merging this pull request will result in the following asset size changes:

Agent	Asset	Previous Size	New Size	Diff
lite	loader	29.86 kB / 10.83 kB (gzip)	29.86 kB / 10.83 kB (gzip)	0% / -0.03% (gzip)
lite	async-chunk	52.76 kB / 17.13 kB (gzip)	51.22 kB / 16.75 kB (gzip)	-2.93% / -2.19% (gzip)
pro	loader	51.95 kB / 17.89 kB (gzip)	51.95 kB / 17.89 kB (gzip)	0% / -0.01% (gzip)
pro	async-chunk	101.89 kB / 31.03 kB (gzip)	100.22 kB / 30.61 kB (gzip)	-1.65% / -1.36% (gzip)
spa	loader	59.56 kB / 20.21 kB (gzip)	59.56 kB / 20.21 kB (gzip)	0% / 0% (gzip)
spa	async-chunk	116.61 kB / 35.36 kB (gzip)	114.93 kB / 34.94 kB (gzip)	-1.44% / -1.19% (gzip)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.67%. Comparing base (46b691b) to head (e303fa7).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1395      +/-   ##
==========================================
- Coverage   88.67%   88.67%   -0.01%     
==========================================
  Files         170      169       -1     
  Lines        7416     7406      -10     
  Branches     1503     1500       -3     
==========================================
- Hits         6576     6567       -9     
  Misses        732      732              
+ Partials      108      107       -1     

Flag	Coverage Δ
integration-tests	90.88% <100.00%> (+0.03%)	⬆️
unit-tests	79.89% <100.00%> (-0.02%)	⬇️

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[github-actions]

Last ran on March 04, 2025 14:31:02 CST
Checking merge of (e303fa7) into main (46b691b)

[metal-messiah]

Can you change the PR title to something more specific for the changelog/release notes

[metal-messiah]

re-testing after branch updates, will approve with passing tests