chore(v3): bump to v3.0.0-alpha.87 and update changelog [skip ci]

Author: github-actions[bot]

docs/src/content/docs/changelog.mdx

@@ -31,6 +31,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 */
 ## [Unreleased]
 
+## v3.0.0-alpha.87 - 2026-05-07
+
+## Added
+- Add Korean documentation for Wails v3 in [PR](https://github.com/wailsapp/wails/pull/5352) by @leaanthony
+- Add French documentation for installation and quick start in [PR](https://github.com/wailsapp/wails/pull/5354) by @leaanthony
+- Add Portuguese documentation for quick start, concepts, and community in [PR](https://github.com/wailsapp/wails/pull/5355) by @leaanthony
+
 ## v3.0.0-alpha.86 - 2026-05-06
 
 ## Added

v3/UNRELEASED_CHANGELOG.md

@@ -17,9 +17,6 @@ After processing, the content will be moved to the main changelog and this file
 
 ## Added
 <!-- New features, capabilities, or enhancements -->
-- Add Korean documentation for Wails v3 in [PR](https://github.com/wailsapp/wails/pull/5352) by @leaanthony
-- Add French documentation for installation and quick start in [PR](https://github.com/wailsapp/wails/pull/5354) by @leaanthony
-- Add Portuguese documentation for quick start, concepts, and community in [PR](https://github.com/wailsapp/wails/pull/5355) by @leaanthony
 
 ## Changed
 <!-- Changes in existing functionality -->

v3/internal/version/version.txt

@@ -1 +1 @@
-v3.0.0-alpha.86
+v3.0.0-alpha.87