perf: reuse canonical deep link URL for verification

[davidmurdoch]

Description

Reuses the canonical deep-link URL across parsing and signature verification so signed links avoid canonicalizing the same URL twice. This also narrows verify so callers pass the required signature and the already-canonical URL directly.

This implements the optimization discussed in #37086 (comment).

Changelog

CHANGELOG entry: null

Related issues

Fixes: N/A

Manual testing steps

1. yarn test:unit shared/lib/deep-links - passed
2. yarn lint:changed:fix - passed
3. yarn lint:tsc - failed on existing repo-wide missing packages/type errors; no changed files were reported

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.

[mm-token-exchange-service]

Builds ready [90614fc]

• ⚠️ Make sure the build is safe before downloading and running this build.
  • Please do not use these builds with accounts that contain significant real money.
  • Beware the security risks of cache poisoning.
• Webpack builds: chrome, firefox
• Webpack builds (beta): chrome, firefox
• Webpack builds (flask): chrome, firefox
• Webpack builds (test): chrome, firefox
• Webpack builds (test-flask): chrome, firefox
• bundle size: Bundle Size Stats
• bundle analyzer: Bundle Analyzer
• interaction-benchmark: Interaction Stats
• storybook: Storybook
• typescript migration: Dashboard
• all artifacts

Deprecated Browserify fallback builds

• Browserify builds: chrome, firefox
• Browserify builds (beta): chrome, firefox
• Browserify builds (flask): chrome, firefox
• Browserify builds (test): chrome, firefox
• Browserify builds (test-flask): chrome, firefox

⚡ Performance Benchmarks (Total: 🟢 14 pass · 🟡 11 warn · 🔴 0 fail)

Baseline (latest main): a568d9c | Date: 6/12/2026 | Pipeline: 27441692241 | Baseline logs

Interaction Benchmarks · Samples: 5

Benchmark	chrome-webpack	firefox-webpack
loadNewAccount [Sentry log · main/release]	🟡 [CI log]	🟢 [CI log]
confirmTx [Sentry log · main/release]	🟡 [CI log]	🟡 [CI log]
bridgeUserActions [Sentry log · main/release]	🟢 [CI log]	🟡 [CI log] 🟡 bridge_search_token

📈 Results compared to the previous 5 runs on main

• ↓ loadNewAccount/load_new_account: -22%
• ↓ loadNewAccount/total: -22%
• ↓ loadNewAccount/inp: -30%
• ↑ confirmTx/lcp: +11%
• ↓ bridgeUserActions/bridge_load_asset_picker: -12%
• ↑ bridgeUserActions/tbt: +19%
• ↓ bridgeUserActions/inp: -26%
• ↑ loadNewAccount/load_new_account: +26%
• ↑ loadNewAccount/total: +26%
• ↑ loadNewAccount/inp: +56%
• ↓ loadNewAccount/fcp: -48%
• ↑ loadNewAccount/lcp: +1240%
• ↑ confirmTx/confirm_tx: +11%
• ↓ confirmTx/longTaskCount: -100%
• ↓ confirmTx/longTaskTotalDuration: -100%
• ↓ confirmTx/longTaskMaxDuration: -100%
• ↓ confirmTx/tbt: -100%
• ↑ confirmTx/total: +11%
• ↓ confirmTx/inp: -10%
• ↑ confirmTx/fcp: +11%
• ↑ confirmTx/lcp: +1236%
• ↑ bridgeUserActions/bridge_load_page: +88%
• ↑ bridgeUserActions/bridge_load_asset_picker: +66%
• ↑ bridgeUserActions/bridge_search_token: +217%
• ↓ bridgeUserActions/longTaskCount: -100%
• ↓ bridgeUserActions/longTaskTotalDuration: -100%
• ↓ bridgeUserActions/longTaskMaxDuration: -100%
• ↓ bridgeUserActions/tbt: -100%
• ↑ bridgeUserActions/total: +190%
• ↓ bridgeUserActions/inp: -26%
• ↑ bridgeUserActions/fcp: +13%
• ↑ bridgeUserActions/lcp: +1263%

🌐 Core Web Vitals — 🟢 good · 🟡 needs improvement · 🔴 poor (web.dev thresholds)

• 🟡 loadNewAccount/FCP: p75 1.9s
• 🟡 confirmTx/FCP: p75 1.8s
• 🟡 confirmTx/FCP: p75 1.9s
• 🟡 bridgeUserActions/FCP: p75 1.9s

Startup Benchmarks · Samples: 100

Benchmark	chrome-webpack	firefox-webpack
startupStandardHome [Sentry log · main/release]	🟢 [CI log]	🟢 [CI log]
startupPowerUserHome [Sentry log · main/release]	🟡 [CI log]	🟡 [CI log]

📈 Results compared to the previous 5 runs on main

• ↓ startupPowerUserHome/numNetworkReqs: -13%
• ↑ startupStandardHome/inp: +50%
• ↑ startupStandardHome/fcp: +16%
• ↑ startupPowerUserHome/domInteractive: +12%
• ↓ startupPowerUserHome/backgroundConnect: -17%
• ↑ startupPowerUserHome/setupStore: +31%

🌐 Core Web Vitals — 🟢 good · 🟡 needs improvement · 🔴 poor (web.dev thresholds)

• 🔴 startupPowerUserHome/INP: p75 552ms
• 🟡 startupPowerUserHome/LCP: p75 2.7s

User Journey Benchmarks · Samples: 5 · mock API

Benchmark	chrome-webpack	firefox-webpack
onboardingImportWallet [Sentry log · main/release]	🟢 [CI log]	🟢 [CI log]
onboardingNewWallet [Sentry log · main/release]	🟢 [CI log]	🟡 [CI log] 🟡 total
assetDetails [Sentry log · main/release]	🟢 [CI log]	🟢 [CI log]
solanaAssetDetails [Sentry log · main/release]	🟢 [CI log]	🟡 [CI log]
importSrpHome [Sentry log · main/release]	🟡 [CI log]	🟡 [CI log]
sendTransactions [Sentry log · main/release]	🟢 [CI log]	🟡 [CI log]
swap [Sentry log · main/release]	🟢 [CI log]	🟢 [CI log]

📈 Results compared to the previous 5 runs on main

• ↑ onboardingImportWallet/srpButtonToSrpForm: +12%
• ↑ onboardingImportWallet/confirmSrpToPwForm: +11%
• ↑ onboardingImportWallet/pwFormToMetricsScreen: +17%
• ↑ onboardingImportWallet/metricsToWalletReadyScreen: +13%
• ↓ onboardingImportWallet/doneButtonToHomeScreen: -84%
• ↓ onboardingImportWallet/openAccountMenuToAccountListLoaded: -73%
• ↓ onboardingImportWallet/longTaskCount: -80%
• ↓ onboardingImportWallet/longTaskTotalDuration: -94%
• ↓ onboardingImportWallet/longTaskMaxDuration: -91%
• ↓ onboardingImportWallet/tbt: -98%
• ↓ onboardingImportWallet/total: -82%
• ↓ onboardingNewWallet/doneButtonToAssetList: -14%
• ↓ onboardingNewWallet/longTaskCount: -50%
• ↓ onboardingNewWallet/longTaskTotalDuration: -49%
• ↓ onboardingNewWallet/longTaskMaxDuration: -20%
• ↓ onboardingNewWallet/tbt: -54%
• ↓ onboardingNewWallet/total: -13%
• ↓ solanaAssetDetails/assetClickToPriceChart: -80%
• ↓ solanaAssetDetails/longTaskCount: -100%
• ↓ solanaAssetDetails/longTaskTotalDuration: -100%
• ↓ solanaAssetDetails/longTaskMaxDuration: -100%
• ↓ solanaAssetDetails/tbt: -100%
• ↓ solanaAssetDetails/total: -80%
• ↓ solanaAssetDetails/inp: -53%
• ↓ solanaAssetDetails/fcp: -24%
• ↓ solanaAssetDetails/lcp: -17%
• ↓ solanaAssetDetails/cls: -97%
• ↓ importSrpHome/loginToHomeScreen: -13%
• ↑ importSrpHome/openAccountMenuAfterLogin: +16%
• ↓ importSrpHome/homeAfterImportWithNewWallet: -39%
• ↓ importSrpHome/longTaskCount: -31%
• ↓ importSrpHome/longTaskTotalDuration: -32%
• ↓ importSrpHome/longTaskMaxDuration: -14%
• ↓ importSrpHome/tbt: -34%
• ↓ importSrpHome/total: -34%
• ↓ importSrpHome/inp: -17%
• ↓ sendTransactions/selectTokenToSendFormLoaded: -26%
• ↓ sendTransactions/inp: -32%
• ↑ sendTransactions/lcp: +15%
• ↓ sendTransactions/cls: -88%

🌐 Core Web Vitals — 🟢 good · 🟡 needs improvement · 🔴 poor (web.dev thresholds)

• 🟡 importSrpHome/INP: p75 208ms
• 🟡 importSrpHome/FCP: p75 1.9s
• 🟡 solanaAssetDetails/FCP: p75 1.8s
• 🟡 importSrpHome/FCP: p75 1.9s
• 🟡 sendTransactions/FCP: p75 2.0s

Dapp Page Load Benchmarks · Samples: 100

Benchmark	chrome-webpack
dappPageLoad [Sentry log · main/release]	🟢 [CI log]

Bundle size diffs

• background: 58 Bytes (0%)
• ui: 195 Bytes (0%)
• common: -58 Bytes (0%)