fix: Implement nonEVM zero balance check to send flow before onAmountInput

[OGPoyraz]

Description

This PR adds zero balance check before onAmountInput RPC call to nonEVM send flow amount validations.

Changelog

CHANGELOG entry:

Related issues

Fixes: MetaMask/metamask-mobile#22812

Manual testing steps

1. Go to send flow
2. Don't have any Tron / SOL / BTC
3. Try sending it but see "insufficient balance" error

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.

---

Note

Adds an early zero-balance check for non-EVM send amount validation and covers it with a new test.

• Validation (send):
  • Non-EVM: Add early zero-balance check in useAmountValidation (validateNonEvmAmount) returning insufficientFundsSend before snap RPC; include rawBalanceNumeric in hook deps.
• Tests:
  • Add test ensuring non-EVM accounts with zero balance surface "Insufficient funds".

^{Written by Cursor Bugbot for commit cd0a0e6. This will update automatically on new commits. Configure here.}

[metamaskbot]

✨ Files requiring CODEOWNER review ✨

✅ @MetaMask/confirmations (2 files, +26 -1)

• 📁 ui/
  • 📁 pages/
    • 📁 confirmations/
      • 📁 hooks/
        • 📁 send/
          • 📄 useAmountValidation.test.ts +21 -0
          • 📄 useAmountValidation.ts +5 -1

[metamaskbot]

Builds ready [cd0a0e6]

• builds: chrome, firefox
• builds (beta): chrome, firefox
• builds (flask): chrome, firefox
• builds (test): chrome, firefox
• builds (test-flask): chrome, firefox
• 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, 9
  • common: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
  • ui: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
  • content-script: 0
  • offscreen: 0

UI Startup Metrics (1246 ± 112 ms)

Platform	BuildType	Page	Metric	Mean (ms)	Min (ms)	Max (ms)	Std Dev (ms)	P 75 (ms)	P 95 (ms)
Chrome	Browserify	Standard Home	uiStartup	1246	1060	1733	112	1324	1419
			load	1065	901	1482	102	1142	1220
			domContentLoaded	1058	898	1477	102	1134	1213
			domInteractive	24	14	94	18	21	83
			firstPaint	591	155	1233	419	1048	1185
			backgroundConnect	212	194	272	12	215	233
			firstReactRender	28	20	51	8	32	45
			getState	34	17	83	12	41	58
			initialActions	1	0	6	1	1	2
			loadScripts	853	693	1258	101	931	1001
			setupStore	12	7	22	4	14	20
			numNetworkReqs	12	5	78	20	5	73
	Browserify	Power User Home	uiStartup	1892	1574	2527	250	2078	2406
			load	1010	885	1913	174	1024	1491
			domContentLoaded	994	879	1888	171	998	1478
			domInteractive	36	16	206	39	29	151
			firstPaint	528	103	1910	418	929	1409
			backgroundConnect	226	201	268	14	233	252
			firstReactRender	82	48	172	17	87	112
			getState	174	127	301	44	196	268
			initialActions	1	0	3	1	1	2
			loadScripts	786	676	1643	168	789	1265
			setupStore	20	10	63	11	27	48
			numNetworkReqs	101	70	202	32	113	183
	Webpack	Standard Home	uiStartup	824	737	1059	72	843	988
			load	624	559	843	65	632	789
			domContentLoaded	620	554	835	65	627	782
			domInteractive	24	14	92	17	21	70
			firstPaint	223	84	845	144	229	596
			backgroundConnect	12	6	37	8	14	30
			firstReactRender	28	19	42	5	32	34
			getState	32	13	92	12	39	50
			initialActions	1	0	2	1	1	1
			loadScripts	617	552	826	63	625	773
			setupStore	12	5	29	4	14	20
			numNetworkReqs	12	5	77	20	5	70
	Webpack	Power User Home	uiStartup	1500	1251	2911	253	1676	1964
			load	700	598	1634	150	699	1050
			domContentLoaded	688	592	1618	149	680	1039
			domInteractive	40	17	265	44	32	163
			firstPaint	281	103	1629	224	287	665
			backgroundConnect	16	7	34	7	20	30
			firstReactRender	85	53	135	11	92	101
			getState	158	127	280	27	167	218
			initialActions	1	0	4	1	1	2
			loadScripts	685	590	1606	147	678	1028
			setupStore	23	7	72	14	33	53
			numNetworkReqs	153	69	305	56	197	276
Firefox	Browserify	Standard Home	uiStartup	1217	1032	1619	119	1266	1492
			load	1028	884	1251	81	1091	1188
			domContentLoaded	1028	884	1251	81	1091	1188
			domInteractive	56	29	175	32	80	116
			firstPaint	-	-	-	-	-	-
			backgroundConnect	35	20	105	15	39	69
			firstReactRender	21	17	54	6	21	34
			getState	10	6	78	11	9	30
			initialActions	1	0	2	0	1	2
			loadScripts	1006	869	1230	80	1074	1149
			setupStore	11	5	163	17	9	26
			numNetworkReqs	12	5	74	18	7	67
	Browserify	Power User Home	uiStartup	2733	1890	3766	377	2908	3600
			load	1192	998	1675	163	1266	1526
			domContentLoaded	1192	998	1675	163	1266	1526
			domInteractive	146	34	541	118	164	461
			firstPaint	-	-	-	-	-	-
			backgroundConnect	251	27	1077	264	336	783
			firstReactRender	88	38	148	16	95	127
			getState	244	86	903	242	195	866
			initialActions	3	1	33	3	3	5
			loadScripts	1149	976	1630	153	1209	1493
			setupStore	116	7	821	167	116	697
			numNetworkReqs	98	59	217	41	91	206
	Webpack	Standard Home	uiStartup	1471	1302	1893	117	1523	1697
			load	1252	1088	1460	93	1305	1433
			domContentLoaded	1252	1088	1460	93	1305	1433
			domInteractive	69	28	211	41	86	138
			firstPaint	-	-	-	-	-	-
			backgroundConnect	41	21	119	18	44	89
			firstReactRender	29	20	82	11	30	69
			getState	11	5	81	8	10	19
			initialActions	1	0	3	1	2	2
			loadScripts	1228	1072	1413	89	1284	1398
			setupStore	14	6	152	18	12	45
			numNetworkReqs	12	5	65	17	6	63
	Webpack	Power User Home	uiStartup	2933	2194	3922	383	3085	3711
			load	1412	1064	1917	197	1559	1814
			domContentLoaded	1412	1064	1917	197	1559	1814
			domInteractive	149	28	811	147	148	516
			firstPaint	-	-	-	-	-	-
			backgroundConnect	198	31	949	230	205	763
			firstReactRender	87	43	142	19	96	127
			getState	305	88	936	290	322	890
			initialActions	4	1	54	8	3	7
			loadScripts	1374	1049	1899	188	1517	1759
			setupStore	117	6	774	181	92	650
			numNetworkReqs	100	68	239	43	94	213

📊 Page Load Benchmark Results

Current Commit: cd0a0e6 | Date: 11/20/2025

📄 Localhost MetaMask Test Dapp

Samples: 100

Summary

• pageLoadTime-> current mean value: 1.04s (±39ms) 🟡 | historical mean value: 1.03s ⬆️ (historical data)
• domContentLoaded-> current mean value: 724ms (±36ms) 🟢 | historical mean value: 721ms ⬆️ (historical data)
• firstContentfulPaint-> current mean value: 77ms (±11ms) 🟢 | historical mean value: 78ms ⬇️ (historical data)

📈 Detailed Results

Metric	Mean	Std Dev	Min	Max	P95	P99
pageLoadTime	1.04s	39ms	1.02s	1.32s	1.07s	1.32s
domContentLoaded	724ms	36ms	701ms	990ms	746ms	990ms
firstPaint	77ms	11ms	60ms	164ms	88ms	164ms
firstContentfulPaint	77ms	11ms	60ms	164ms	88ms	164ms
largestContentfulPaint	0ms	0ms	0ms	0ms	0ms	0ms

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

• background: 53 Bytes (0%)
• ui: 432 Bytes (0.01%)
• common: 44 Bytes (0%)