fix: cp-13.5.0 Send functionality related fixes

[jpuri]

Description

Multiple small new send implementation related fixes.

Changelog

CHANGELOG entry:

Related issues

Fixes: #36787
Fixes: #36789
Fixes: #36757

Manual testing steps

1. Trigger send flow
2. Check the new amount recipient page

Screenshots/Recordings

TODO

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.

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Note

Refines send flow by showing fiat currency code in Amount, exposing fiatCurrencyName, safely handling missing gas estimates for max amount, standardizing name-resolution error, and returning unique recipients (with tests and i18n updates).

• Send Flow:
  • Amount input (ui/.../amount.tsx): Show fiat currency code when in fiat mode; uses fiatCurrencyName from useCurrencyConversions.
  • Currency conversions (useCurrencyConversions.ts): Expose fiatCurrencyName in hook return.
  • Max amount (useMaxAmount.ts): Gracefully handle missing gasFeeEstimates (default to 0) in getEstimatedTotalGas.
  • Name resolution (useNameValidation.ts): Use error: \nameResolutionFailedError`` for failed lookups.
  • Recipients (useRecipients.ts): Return accounts first and de-duplicate contacts by address.
• i18n:
  • Add nameResolutionFailedError string to app/_locales/en/messages.json and en_GB/messages.json.
• Tests:
  • Update Amount tests to use fiatCurrencySymbol: '$' and assert USD; add coverage for fiat toggle behavior.
  • Add test ensuring max amount does not throw when gas estimates are unavailable.
  • Update recipient tests for de-duplication and ordering.
  • Update recipient validation tests for new name resolution error key.

^{Written by Cursor Bugbot for commit 6b1e9ae. This will update automatically on new commits. Configure here.}

[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/confirmations (9 files, +115 -21)

• 📁 ui/
  • 📁 pages/
    • 📁 confirmations/
      • 📁 components/
        • 📁 send/
          • 📁 amount/
            • 📄 amount.test.tsx +23 -11
            • 📄 amount.tsx +4 -1
      • 📁 hooks/
        • 📁 send/
          • 📄 useCurrencyConversions.ts +1 -0
          • 📄 useMaxAmount.test.ts +26 -0
          • 📄 useMaxAmount.ts +2 -3
          • 📄 useNameValidation.ts +2 -2
          • 📄 useRecipients.test.ts +41 -0
          • 📄 useRecipients.ts +14 -2
          • 📄 useRecipientValidation.test.ts +2 -2

[metamaskbot]

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

[metamaskbot]

📊 Page Load Benchmark Results

Current Commit: 6b1e9ae | Date: 10/14/2025

📄 Localhost MetaMask Test Dapp

Samples: 100

Summary

• pageLoadTime-> current mean value: 1.04s (±71ms) 🟡 | historical mean value: 1.05s ⬇️ (historical data)
• domContentLoaded-> current mean value: 728ms (±68ms) 🟢 | historical mean value: 739ms ⬇️ (historical data)
• firstContentfulPaint-> current mean value: 75ms (±11ms) 🟢 | historical mean value: 77ms ⬇️ (historical data)

📈 Detailed Results

Metric	Mean	Std Dev	Min	Max	P95	P99
pageLoadTime	1.04s	71ms	1.00s	1.31s	1.25s	1.31s
domContentLoaded	728ms	68ms	694ms	993ms	929ms	993ms
firstPaint	75ms	11ms	60ms	168ms	84ms	168ms
firstContentfulPaint	75ms	11ms	60ms	168ms	84ms	168ms
largestContentfulPaint	0ms	0ms	0ms	0ms	0ms	0ms

---

Results generated automatically by MetaMask CI

[metamaskbot]

Builds ready [6b1e9ae]

• 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 (1210 ± 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	1210	1086	1396	62	1248	1316
			load	1048	949	1239	59	1078	1162
			domContentLoaded	1042	944	1234	58	1072	1157
			domInteractive	18	13	48	7	17	37
			firstPaint	694	96	1240	409	1055	1146
			backgroundConnect	250	238	274	7	254	265
			firstReactRender	24	18	53	6	25	40
			getState	10	5	37	5	11	20
			initialActions	4	0	28	5	4	15
			loadScripts	797	707	985	58	825	914
			setupStore	8	5	17	2	9	13
	Webpack	Home	uiStartup	856	737	1107	67	877	983
			load	649	602	937	65	660	812
			domContentLoaded	641	595	926	64	651	805
			domInteractive	17	12	62	10	15	39
			firstPaint	222	57	903	230	194	763
			backgroundConnect	22	10	51	7	27	32
			firstReactRender	30	17	83	12	34	60
			getState	9	4	26	4	10	17
			initialActions	2	0	10	2	3	7
			loadScripts	638	593	915	62	649	794
			setupStore	9	4	22	3	10	13
Firefox	Browserify	Home	uiStartup	1379	1210	1763	113	1429	1585
			load	1185	1059	1455	84	1254	1321
			domContentLoaded	1185	1058	1455	84	1253	1320
			domInteractive	100	31	313	51	108	233
			firstPaint	NaN	NaN	NaN	NaN	NaN	NaN
			backgroundConnect	28	18	100	10	31	37
			firstReactRender	29	24	73	6	30	36
			getState	7	2	91	11	5	20
			initialActions	3	0	28	5	2	16
			loadScripts	1163	1037	1426	81	1226	1294
			setupStore	9	4	138	15	7	24
	Webpack	Home	uiStartup	1576	1377	2235	126	1611	1860
			load	1359	1218	1687	83	1388	1546
			domContentLoaded	1358	1218	1687	83	1388	1544
			domInteractive	105	30	380	64	107	302
			firstPaint	NaN	NaN	NaN	NaN	NaN	NaN
			backgroundConnect	32	20	182	18	36	51
			firstReactRender	38	27	114	14	39	77
			getState	9	2	155	22	6	28
			initialActions	5	0	95	12	2	21
			loadScripts	1333	1201	1555	77	1361	1527
			setupStore	14	4	226	26	8	48

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

• background: 58 Bytes (0%)
• ui: 227 Bytes (0%)
• common: 91 Bytes (0%)