fix(deps): replace dependency @material-ui/core with @mui/material

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
@material-ui/core (source) → @mui/material	dependencies	replacement	4.9.14 → 5.0.0

This is a special PR that replaces @material-ui/core with the community suggested minimal stable replacement version.

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[renovate]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

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The artifact failure details are included below:

File name: package-lock.json

npm ERR! code ERESOLVE
npm ERR! ERESOLVE unable to resolve dependency tree
npm ERR! 
npm ERR! While resolving: @multei/web@0.1.0
npm ERR! Found: react@17.0.1
npm ERR! node_modules/react
npm ERR!   react@"17.0.1" from the root project
npm ERR!   peer react@">=16.8.0" from @emotion/react@11.14.0
npm ERR!   node_modules/@emotion/react
npm ERR!     peerOptional @emotion/react@"^11.4.1" from @mui/material@5.0.0
npm ERR!     node_modules/@mui/material
npm ERR!       @mui/material@"5.0.0" from the root project
npm ERR!     peer @emotion/react@"^11.0.0-rc.0" from @emotion/styled@11.14.1
npm ERR!     node_modules/@emotion/styled
npm ERR!       peerOptional @emotion/styled@"^11.3.0" from @mui/material@5.0.0
npm ERR!       node_modules/@mui/material
npm ERR!         @mui/material@"5.0.0" from the root project
npm ERR!   1 more (@emotion/styled)
npm ERR! 
npm ERR! Could not resolve dependency:
npm ERR! peer react@"^17.0.2" from @mui/material@5.0.0
npm ERR! node_modules/@mui/material
npm ERR!   @mui/material@"5.0.0" from the root project
npm ERR! 
npm ERR! Fix the upstream dependency conflict, or retry
npm ERR! this command with --force, or --legacy-peer-deps
npm ERR! to accept an incorrect (and potentially broken) dependency resolution.
npm ERR! 
npm ERR! See /runner/cache/others/npm/eresolve-report.txt for a full report.

npm ERR! A complete log of this run can be found in:
npm ERR!     /runner/cache/others/npm/_logs/2026-07-12T17_59_38_010Z-debug-0.log

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Name	Link
🔨 Latest commit	ee57b4d
🔍 Latest deploy log	https://app.netlify.com/sites/multei/deploys/6755e2d924d51b0008c0a6f8

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[Copilot]

Pull request overview

This PR updates the project’s UI component library dependency by replacing @material-ui/core (Material-UI v4) with @mui/material (MUI v5) in order to move to the community-recommended successor package.

Changes:

• Replace the @material-ui/core dependency with @mui/material@5.0.0 in package.json.

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[jimmyandrade]

Agreed. This PR cannot be merged as a package-only replacement: the codebase still imports @material-ui/core, and the v4 companion packages (@material-ui/icons, @material-ui/lab, @material-ui/styles, gatsby-plugin-material-ui) would also need a coordinated MUI v5 migration.

I am leaving this blocked instead of merging the dependency swap as-is.

[jimmyandrade]

Blocked in oldest-PR triage: this is not a safe dependency-only PR. Replacing @material-ui/core with @mui/material requires a coordinated MUI v4 -> v5 migration across imports, theme setup, icons/lab/styles packages, and Gatsby integration. Not merging as-is.

[jimmyandrade]

Created follow-up migration issue: #436. Keeping this PR blocked; not migrating MUI v5 in the oldest-PR drain.