feat: add the waters

frontend/src/app/platform/PlatformPage.tsx

@@ -25,8 +25,8 @@ function PlatformLayoutInner() {
   return (
     <SidebarProvider open={sidebarOpen} onOpenChange={setSidebarOpen}>
       <AppSidebar />
-      <div className="relative flex min-h-0 w-full flex-1 flex-col bg-background">
-        <div className="flex min-h-0 flex-1 flex-col">
+      <div className="relative flex h-dvh min-h-0 w-full flex-1 flex-col overflow-hidden bg-background">
+        <div className="flex min-h-0 flex-1 flex-col overflow-hidden">
           <Outlet />
         </div>
       </div>

frontend/src/app/platform/ProjectsPage.tsx

@@ -58,6 +58,7 @@ import {
 } from './projectGraphStorage'
 import { toast } from 'sonner'
 import { NewProjectDialog } from './NewProjectDialog'
+import { ProjectsPageBackground } from './ProjectsPageBackground'
 import type { Project } from './types'
 
 const PAGE_SIZE_OPTIONS = [10, 25, 50] as const
@@ -315,7 +316,9 @@ export function ProjectsPage() {
   )
 
   return (
-    <div className="flex flex-1 flex-col gap-4 p-4">
+    <div className="relative flex flex-1 flex-col min-h-0">
+      <ProjectsPageBackground className="absolute inset-0 pointer-events-none" />
+      <div className="relative flex min-h-0 flex-1 flex-col gap-4 p-4 overflow-auto">
       <TooltipProvider>
         <div className="flex flex-wrap items-center gap-3">
           <h1 className="p-3 scroll-m-20 text-4xl font-extrabold tracking-tight text-balance">
@@ -797,6 +800,7 @@ export function ProjectsPage() {
           </DialogContent>
         </Dialog>
       </TooltipProvider>
+      </div>
     </div>
   )
 }

frontend/src/app/platform/ProjectsPageBackground.tsx

@@ -0,0 +1,99 @@
+/**
+ * Subtle animated dot grid background for ProjectsPage.
+ * Matches canvas grid (20px gap), with gentle wave movement.
+ */
+
+import React, { useCallback, useEffect, useRef } from 'react'
+
+const GAP = 20
+const SPEED = 0.010
+const AMPLITUDE = 4
+const DOT_SIZE = 1.2
+const PULSE_AMOUNT = 0.25
+
+function getDotColor(): string {
+  if (typeof document === 'undefined') return 'rgba(128,128,128,0.25)'
+  const isDark = document.documentElement.classList.contains('dark')
+  return isDark ? 'rgba(255,255,255,0.18)' : 'rgba(0,0,0,0.12)'
+}
+
+export function ProjectsPageBackground({ className }: { className?: string }) {
+  const canvasRef = useRef<HTMLCanvasElement>(null)
+  const timeRef = useRef(0)
+  const rafRef = useRef<number>(0)
+
+  const draw = useCallback(() => {
+    const canvas = canvasRef.current
+    if (!canvas) return
+
+    const ctx = canvas.getContext('2d')
+    if (!ctx) return
+
+    const { width, height } = canvas
+    const cols = Math.floor(width / GAP) + 2
+    const rows = Math.floor(height / GAP) + 2
+    const t = timeRef.current
+
+    ctx.fillStyle = 'transparent'
+    ctx.clearRect(0, 0, width, height)
+
+    const dotColor = getDotColor()
+
+    for (let row = 0; row < rows; row++) {
+      for (let col = 0; col < cols; col++) {
+        const baseX = col * GAP
+        const baseY = row * GAP
+
+        const w1 = Math.sin(t * SPEED + baseX * 0.008 + baseY * 0.006) * AMPLITUDE
+        const w2 = Math.sin(t * SPEED * 0.7 - baseX * 0.012 + baseY * 0.01) * AMPLITUDE * 0.5
+        const w3 = Math.sin(t * SPEED * 1.2 + baseY * 0.015) * AMPLITUDE * 0.3
+
+        const x = baseX + w1 + w2 + w3
+        const y = baseY + w1 * 0.6 + w3 * 0.4
+
+        const size = DOT_SIZE + Math.sin(t * SPEED * 2 + baseX * 0.02) * PULSE_AMOUNT
+
+        ctx.beginPath()
+        ctx.arc(x, y, size, 0, Math.PI * 2)
+        ctx.fillStyle = dotColor
+        ctx.fill()
+      }
+    }
+
+    timeRef.current += 1
+    rafRef.current = requestAnimationFrame(draw)
+  }, [])
+
+  useEffect(() => {
+    const canvas = canvasRef.current
+    if (!canvas) return
+
+    const resize = () => {
+      const dpr = Math.min(window.devicePixelRatio ?? 1, 2)
+      const rect = canvas.getBoundingClientRect()
+      canvas.width = Math.round(rect.width * dpr)
+      canvas.height = Math.round(rect.height * dpr)
+      canvas.style.width = `${rect.width}px`
+      canvas.style.height = `${rect.height}px`
+      const ctx = canvas.getContext('2d')
+      if (ctx) ctx.setTransform(dpr, 0, 0, dpr, 0, 0)
+    }
+
+    resize()
+    window.addEventListener('resize', resize)
+    rafRef.current = requestAnimationFrame(draw)
+    return () => {
+      window.removeEventListener('resize', resize)
+      if (rafRef.current) cancelAnimationFrame(rafRef.current)
+    }
+  }, [draw])
+
+  return (
+    <canvas
+      ref={canvasRef}
+      className={className}
+      aria-hidden
+      style={{ display: 'block', width: '100%', height: '100%' }}
+    />
+  )
+}