feat: mutualize account sync and discovery

[mathieuartu]

Description

This PR mutualizes account syncing and account discovery in one method that can be called from the background.
This also makes sure that the Snap Keyring is available before attempting syncing and discovery.

Changelog

CHANGELOG entry: null

Related issues

Fixes:

Manual testing steps

1. Go to this page...

Screenshots/Recordings

Before

After

Pre-merge author checklist

• I've followed MetaMask Contributor Docs and MetaMask Extension Coding Standards.
• I've completed the PR template to the best of my ability
• I’ve included tests if applicable
• I’ve documented my code using JSDoc format if applicable
• I’ve applied the right labels on the PR (see labeling guidelines). Not required for external contributors.

Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
• I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.

[github-actions]

CLA Signature Action: All authors have signed the CLA. You may need to manually re-run the blocking PR check if it doesn't pass in a few minutes.

[metamaskbot]

✨ Files requiring CODEOWNER review ✨

🪪 @MetaMask/identity (1 files, +18 -9)

• 📁 ui/
  • 📁 hooks/
    • 📁 identity/
      • 📁 useAccountSyncing/
        • 📄 useAccountSyncing.ts +18 -9

[metamaskbot]

❌ test-e2e-chrome-api-specs failed. View the html report here.

[metamaskbot]

📊 Page Load Benchmark Results

Current Commit: 97c08db | Date: 9/22/2025

📄 Localhost MetaMask Test Dapp

Samples: 100

Summary

• pageLoadTime-> current mean value: 1.09s (±74ms) 🟡 | historical mean value: 1.06s ⬆️ (historical data)
• domContentLoaded-> current mean value: 768ms (±71ms) 🟢 | historical mean value: 742ms ⬆️ (historical data)
• firstContentfulPaint-> current mean value: 81ms (±12ms) 🟢 | historical mean value: 80ms ⬆️ (historical data)

📈 Detailed Results

Metric	Mean	Std Dev	Min	Max	P95	P99
pageLoadTime	1.09s	74ms	1.05s	1.38s	1.32s	1.38s
domContentLoaded	768ms	71ms	728ms	1.05s	982ms	1.05s
firstPaint	81ms	12ms	64ms	188ms	88ms	188ms
firstContentfulPaint	81ms	12ms	64ms	188ms	88ms	188ms
largestContentfulPaint	0ms	0ms	0ms	0ms	0ms	0ms

---

Results generated automatically by MetaMask CI

[metamaskbot]

Builds ready [97c08db]

• builds: chrome, firefox
• builds (beta): chrome, firefox
• builds (flask): chrome, firefox
• builds (test): chrome, firefox
• builds (test-flask): chrome, firefox
• build viz: Build System
• bundle size: Bundle Size Stats
• user-actions-benchmark: User Actions Stats
• storybook: Storybook
• typescript migration: Dashboard
• all artifacts
• bundle viz:

  • background: 0, 1, 2, 3, 4, 5, 6, 7, 8
  • common: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13
  • ui: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14
  • content-script: 0
  • offscreen: 0

UI Startup Metrics (1218 ± 62 ms)

Platform	BuildType	Page	Metric	Mean (ms)	Min (ms)	Max (ms)	Std Dev (ms)	P 75 (ms)	P 95 (ms)
Chrome	Browserify	Home	uiStartup	1218	1091	1435	62	1256	1317
			load	1048	936	1208	56	1084	1142
			domContentLoaded	1041	930	1201	56	1079	1137
			domInteractive	18	14	49	7	17	40
			firstPaint	606	88	1216	418	1048	1124
			backgroundConnect	214	199	256	7	217	224
			firstReactRender	25	19	47	5	25	35
			getState	13	5	46	6	17	24
			initialActions	5	1	44	6	6	19
			loadScripts	834	723	987	54	871	922
			setupStore	9	5	28	3	9	16
	Webpack	Home	uiStartup	1162	955	1357	105	1240	1318
			load	978	788	1125	98	1043	1100
			domContentLoaded	973	785	1121	98	1039	1097
			domInteractive	16	12	53	8	14	40
			firstPaint	138	62	402	57	171	248
			backgroundConnect	15	11	39	5	15	28
			firstReactRender	35	33	48	3	36	41
			getState	7	4	22	3	7	13
			initialActions	7	2	24	4	8	13
			loadScripts	970	783	1119	98	1035	1095
			setupStore	8	6	20	3	9	16
Firefox	Browserify	Home	uiStartup	1353	1184	1886	107	1422	1519
			load	1180	1044	1388	79	1249	1296
			domContentLoaded	1179	1043	1387	79	1249	1296
			domInteractive	100	33	307	54	102	239
			firstPaint	NaN	NaN	NaN	NaN	NaN	NaN
			backgroundConnect	30	18	208	21	31	49
			firstReactRender	28	23	59	6	30	41
			getState	7	2	106	11	6	18
			initialActions	3	1	12	2	3	8
			loadScripts	1157	1026	1373	77	1223	1275
			setupStore	8	5	39	5	8	20
	Webpack	Home	uiStartup	1682	1436	2110	137	1788	1897
			load	1436	1222	1808	121	1551	1632
			domContentLoaded	1435	1221	1807	121	1551	1632
			domInteractive	108	33	462	64	106	302
			firstPaint	NaN	NaN	NaN	NaN	NaN	NaN
			backgroundConnect	32	22	69	7	35	44
			firstReactRender	49	40	63	5	52	58
			getState	8	3	170	16	7	9
			initialActions	3	1	14	2	4	6
			loadScripts	1412	1197	1787	122	1522	1613
			setupStore	11	6	81	9	10	22

Benchmark value 215 exceeds gate value 10 for chrome browserify home mean backgroundConnect
Benchmark value 26 exceeds gate value 23 for chrome browserify home mean firstReactRender
Benchmark value 6 exceeds gate value 1 for chrome browserify home mean initialActions
Benchmark value 834 exceeds gate value 830 for chrome browserify home mean loadScripts
Benchmark value 224 exceeds gate value 18 for chrome browserify home p95 backgroundConnect
Benchmark value 19 exceeds gate value 1.2 for chrome browserify home p95 initialActions
Benchmark value 13 exceeds gate value 7 for chrome webpack home p95 initialActions
Benchmark value 31 exceeds gate value 25 for firefox browserify home mean backgroundConnect
Benchmark value 29 exceeds gate value 25 for firefox browserify home mean firstReactRender
Benchmark value 3 exceeds gate value 1 for firefox browserify home mean initialActions
Benchmark value 239 exceeds gate value 195 for firefox browserify home p95 domInteractive
Benchmark value 8 exceeds gate value 2 for firefox browserify home p95 initialActions
Benchmark value 1682 exceeds gate value 1615 for firefox webpack home mean uiStartup
Benchmark value 1436 exceeds gate value 1380 for firefox webpack home mean load
Benchmark value 1436 exceeds gate value 1380 for firefox webpack home mean domContentLoaded
Benchmark value 108 exceeds gate value 100 for firefox webpack home mean domInteractive
Benchmark value 32 exceeds gate value 26 for firefox webpack home mean backgroundConnect
Benchmark value 50 exceeds gate value 38 for firefox webpack home mean firstReactRender
Benchmark value 4 exceeds gate value 1 for firefox webpack home mean initialActions
Benchmark value 1412 exceeds gate value 1360 for firefox webpack home mean loadScripts
Benchmark value 302 exceeds gate value 156 for firefox webpack home p95 domInteractive
Benchmark value 58 exceeds gate value 50 for firefox webpack home p95 firstReactRender
Benchmark value 6 exceeds gate value 2 for firefox webpack home p95 initialActions
Sum of mean exceeds: 489ms | Sum of p95 exceeds: 437.8ms
Sum of all benchmark exceeds: 926.8ms

Bundle size diffs [🚨 Warning! Bundle size has increased!]

• background: 337 Bytes (0.01%)
• ui: 5 Bytes (0%)
• common: 18 Bytes (0%)