Forms: Fix textarea placeholders to match input placeholder styling (#46310)

* make inputs and textearea placeholders match style

* Add changelog entry for forms placeholder fix

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <[email protected]>

---------

Co-authored-by: Claude Sonnet 4.5 <[email protected]>

Committed via a GitHub action: https://github.com/Automattic/jetpack/actions/runs/20269570666

Upstream-Ref: Automattic/jetpack@6bb870b

Author: CGastrell

CHANGELOG.md

@@ -30,6 +30,7 @@ This is an alpha version! The changes listed here are not final.
 - Forms: Removes classic Admin initialization code
 
 ### Fixed
+- Fixed textarea placeholders to match input placeholder styling
 - Fix export functionality to handle null values properly for IP Address, Country code, and Browser fields
 - Fix `Contact_Form_Endpoint_Test::test_resend_email` attempting to actually send email.
 - Forms: ensure submission summary is contained within 100% width

dist/contact-form/css/grunion-rtl.css

@@ -18,14 +18,18 @@
 	clear: both;
 }
 
+.contact-form textarea::placeholder,
 .contact-form input::placeholder {
+	color: inherit;
 	transition: opacity 0.3s ease-out;
 }
 
+.contact-form textarea:hover::placeholder,
 .contact-form input:hover::placeholder {
 	opacity: 0.5;
 }
 
+.contact-form textarea:focus::placeholder,
 .contact-form input:focus::placeholder {
 	opacity: 0.3;
 }