chore(PLA-2206): add exponential backoff with jitter to Phoenix socket reconnection

[jareddellitt]

Description

The default Phoenix Socket reconnection schedule is deterministic and aggressive (first retry at 10ms, no randomization), which causes all clients to slam the server at the same instant when connectivity is restored. This configures reconnectAfterMs and rejoinAfterMs on the Phoenix Socket with exponential backoff and full jitter to try to mitigate some thundering herd problems during outages or deployments.

[linear]

PLA-2206 Reduce thundering herd severity by making the reconnect logic less aggressive

[changeset-bot]

🦋 Changeset detected

Latest commit: 40b89e3

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 13 packages

Name	Type
@knocklabs/client	Patch
client-example	Patch
guide-example	Patch
@knocklabs/expo	Patch
@knocklabs/react-core	Patch
@knocklabs/react-native	Patch
@knocklabs/react	Patch
@knocklabs/expo-example	Patch
ms-teams-connect-example	Patch
nextjs-app-dir-example	Patch
nextjs-example	Patch
slack-connect-example	Patch
slack-kit-example	Patch

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Project	Deployment	Actions	Updated (UTC)
javascript-ms-teams-connect-example	Ready	Preview, Comment	Feb 14, 2026 2:23pm
javascript-nextjs-example	Ready	Preview, Comment	Feb 14, 2026 2:23pm
javascript-slack-connect-example	Ready	Preview, Comment	Feb 14, 2026 2:23pm
javascript-slack-kit-example	Ready	Preview, Comment	Feb 14, 2026 2:23pm

[connorlindsey]

🙌

[codecov]

Codecov Report

❌ Patch coverage is 96.87500% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 67.28%. Comparing base (b77679b) to head (40b89e3).
⚠️ Report is 4 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
packages/client/src/helpers.ts	94.73%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #862      +/-   ##
==========================================
+ Coverage   66.96%   67.28%   +0.32%     
==========================================
  Files         203      203              
  Lines        8539     8537       -2     
  Branches     1104     1109       +5     
==========================================
+ Hits         5718     5744      +26     
+ Misses       2801     2768      -33     
- Partials       20       25       +5     

Files with missing lines	Coverage Δ
packages/client/src/api.ts	100.00% <100.00%> (ø)
packages/client/src/helpers.ts	95.83% <94.73%> (-4.17%)	⬇️

... and 11 files with indirect coverage changes