Bump version to 18.4.0, add unreleased changelog section (#1361)

Update spine-plugin README: Application pattern, v2.1.0 compat table (#1360)

Add missing release dates to changelog (#1359)

Update dev dependencies (#1358)

Fix sprite flicker broken with multi-camera setups (#1357)

Fix floating containers with Infinity bounds not rendering (#1356)

Fix BitmapText bounding box alignment and baseline positioning (#1355)

Merge pull request #1354 from melonjs/feature/bezier-curves

Fix no-this-alias lint error: use gradient ID instead of this reference

Address Copilot: cache shared gradient render, doc scratch array, fix test name

Fix gradient memory leak, optimize setLineDash, clean up graphics example

Fix dashPath zero-skip loop guard, add consecutive zeros test

Fix dashPath zero-length segments, add test

Add explicit renderer: video.AUTO to graphics example

Graphics example: migrate to Application, Commodore rainbow stripes, animated curves