fix(core): update login page & error message styles

[bc-alexsaiannyi]

What/Why?

This PR updates layout & styles for Login page that include:

• reducing size for heading,
• reduce margin bootom,
• center "Forgot password" button on mobile

Also it unites message size & colour for error validation on form fields.

Testing

locally

https://github.com/user-attachments/assets/75a2be6d-0144-42b7-87e3-3ba71ed04436

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: b296184bbc35dc749da98b1e0439bdb54279c476

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | -------------------------- | ----- | | @bigcommerce/catalyst-core | Patch |

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Click here if you're a maintainer who wants to add another changeset to this PR

[vercel[bot]]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Comments	Updated (UTC)
catalyst-latest	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 25, 2024 9:21am

6 Skipped Deployments

| Name | Status | Preview | Comments | Updated (UTC) | | :--- | :----- | :------ | :------- | :------ | | **catalyst** | ⬜️ Ignored ([Inspect](https://vercel.com/bigcommerce-platform/catalyst/71983XAZbfjeGrTrQxCxKXxXNaf5)) | | | Oct 25, 2024 9:21am | | **catalyst-1millionproducts-store** | ⬜️ Ignored ([Inspect](https://vercel.com/bigcommerce-platform/catalyst-1millionproducts-store/E5WgiY7okhNRidhNaYTWn3HAsWpn)) | [Visit Preview](https://catalyst-1millionproducts-store-git-6612ac-bigcommerce-platform.vercel.app) | | Oct 25, 2024 9:21am | | **catalyst-au** | ⬜️ Ignored ([Inspect](https://vercel.com/bigcommerce-platform/catalyst-au/5Q13XmoBgnUwoVihbEc49HMrCS1U)) | [Visit Preview](https://catalyst-au-git-fix-login-page-bigcommerce-platform.vercel.app) | | Oct 25, 2024 9:21am | | **catalyst-test-store** | ⬜️ Ignored ([Inspect](https://vercel.com/bigcommerce-platform/catalyst-test-store/APuS28zA4ryCTccDbvRfn4BxMZE2)) | [Visit Preview](https://catalyst-test-store-git-fix-login-page-bigcommerce-platform.vercel.app) | | Oct 25, 2024 9:21am | | **catalyst-uk** | ⬜️ Ignored ([Inspect](https://vercel.com/bigcommerce-platform/catalyst-uk/9ndbU9oVGjzHCKFt5jYQpVeGrALS)) | [Visit Preview](https://catalyst-uk-git-fix-login-page-bigcommerce-platform.vercel.app) | | Oct 25, 2024 9:21am | | **catalyst-unstable** | ⬜️ Ignored ([Inspect](https://vercel.com/bigcommerce-platform/catalyst-unstable/79RFgKtdewVTNBQsbdxtx4DLhbSM)) | [Visit Preview](https://catalyst-unstable-git-fix-login-page-bigcommerce-platform.vercel.app) | | Oct 25, 2024 9:21am |

[chanceaclark]

Make sure to add a changeset

[github-actions[bot]]

⚡️🏠 Lighthouse report

Lighthouse ran against https://catalyst-latest-pd8b9uxue-bigcommerce-platform.vercel.app

🖥️ Desktop

We ran Lighthouse against the changes on a desktop and produced this report. Here's the summary:

Category	Score
🟠 Performance	85
🟢 Accessibility	96
🟢 Best practices	100
🟠 SEO	82

📱 Mobile

We ran Lighthouse against the changes on a mobile and produced this report. Here's the summary:

Category	Score
🟢 Performance	90
🟢 Accessibility	96
🟢 Best practices	100
🟠 SEO	85