fix(ui): improve mobile layout for subscribe form (#520)

[dedyf5]

1. Does this PR affect any open issues?(Y/N) and add issue references (e.g. "fix #123", "re #123".):

• N
• Y
  fix [BUG] Mobile UI: Subscribe Form Layout Issue on Small Screens #520

2. What is the scope of this PR (e.g. component or file name):

website/ui (specifically src/components/Form/index.tsx)

3. Provide a description of the PR(e.g. more details, effects, motivations or doc link):

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Other (UI/Visual Improvement)

Visual Changes:

Viewport	Status	Screenshot	Description
Mobile	Before (Problematic)		Vertical stacking of input and button, appearing untidy.
Mobile	After (Proposed Fix)		Horizontal alignment for a tidier and more integrated look.
Desktop	Unaffected		Desktop layout remains unchanged and functional.

4. Are there any breaking changes?(Y/N) and describe the breaking changes(e.g. more details, motivations or doc link):

• N
• Y

5. Are there test cases for these changes?(Y/N) select and add more details, references or doc links:

• Unit test
• Integration test
• Benchmark (add benchmark stats below)
• Manual test (add detailed scripts or steps below)
• Other

Manual Test Steps:

1. Navigate to https://www.kcl-lang.io/ on a mobile device (or resize your browser to a typical mobile viewport width) AND on a desktop browser.
2. Scroll down to the "Subscribe to Newsletter" section.
3. On mobile, verify that the email input field and the "SUBSCRIBE" button are now aligned horizontally and display cleanly without awkward stacking.
4. On desktop, verify that the form layout remains unchanged and functions as expected.

[vercel]

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

Name	Status	Preview	Comments	Updated (UTC)
kcl-lang-io	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 3, 2025 5:49am

[Peefy]

LGTM! Thank you!