refactor: split monolithic state into context-based modules

Extract image, desktop, mobile, and config state into separate context
providers to improve modularity and reduce unnecessary re-renders.

Signed-off-by: Sped0n <hi@sped0n.com>

assets/ts/mobile/galleryTransitions.ts

@@ -0,0 +1,64 @@
+import { type gsap } from 'gsap'
+
+const OPEN_DELAY_MS = 1200
+const CLOSE_DELAY_MS = 1400
+
+export function openGallery(args: {
+  gsap: typeof gsap
+  curtain: HTMLDivElement
+  gallery: HTMLDivElement
+  setIsAnimating: (value: boolean) => void
+  setIsScrollLocked: (value: boolean) => void
+}): void {
+  const { gsap, curtain, gallery, setIsAnimating, setIsScrollLocked } = args
+
+  setIsAnimating(true)
+
+  gsap.to(curtain, {
+    opacity: 1,
+    duration: 1
+  })
+
+  gsap.to(gallery, {
+    y: 0,
+    ease: 'power3.inOut',
+    duration: 1,
+    delay: 0.4
+  })
+
+  setTimeout(() => {
+    setIsScrollLocked(true)
+    setIsAnimating(false)
+  }, OPEN_DELAY_MS)
+}
+
+export function closeGallery(args: {
+  gsap: typeof gsap
+  curtain: HTMLDivElement
+  gallery: HTMLDivElement
+  setIsAnimating: (value: boolean) => void
+  setIsScrollLocked: (value: boolean) => void
+  onClosed: () => void
+}): void {
+  const { gsap, curtain, gallery, setIsAnimating, setIsScrollLocked, onClosed } = args
+
+  setIsAnimating(true)
+
+  gsap.to(gallery, {
+    y: '100%',
+    ease: 'power3.inOut',
+    duration: 1
+  })
+
+  gsap.to(curtain, {
+    opacity: 0,
+    duration: 1.2,
+    delay: 0.4
+  })
+
+  setTimeout(() => {
+    setIsScrollLocked(false)
+    setIsAnimating(false)
+    onClosed()
+  }, CLOSE_DELAY_MS)
+}