fix: read idleTimeoutMin from settings; clean up idle + splash canvas fixes

src/lib/components/chrome/SplashScreen.svelte

@@ -290,6 +290,7 @@
       if (logW <= 0 || logH <= 0) return
       if (logW === lastLogW && logH === lastLogH && scale === lastScale) return
       lastLogW = logW; lastLogH = logH; lastScale = scale
+      if (live) cleanup()  // release old offscreen canvases before rebuilding at new size
       const built  = buildCards(logW, logH)
       const stamps = built.cards.map(c => buildStamp(c, scale))
       const vig    = buildVignette(logW, logH, scale)
@@ -339,10 +340,25 @@
     function resume() { if (!paused) return; paused = false; raf = requestAnimationFrame(frame) }
     function onVis()  { document.hidden ? pause() : resume() }
 
+    // clears all canvas contexts and nulls live state so the GC can collect the offscreen bitmaps
+    function cleanup() {
+      if (live) {
+        live.stamps.forEach(canvas => {
+          const c = canvas.getContext('2d')
+          if (c) c.clearRect(0, 0, canvas.width, canvas.height)
+        })
+        const vigCtx = live.vignette.getContext('2d')
+        if (vigCtx) vigCtx.clearRect(0, 0, live.vignette.width, live.vignette.height)
+      }
+      ctx.clearRect(0, 0, el.width, el.height)
+      live = null
+    }
+
     document.addEventListener('visibilitychange', onVis)
     raf = requestAnimationFrame(frame)
     return () => {
       cancelAnimationFrame(raf)
+      cleanup()
       extraCleanup?.()
       document.removeEventListener('visibilitychange', onVis)
     }

src/routes/+layout.svelte

@@ -24,6 +24,7 @@
 
   const POLL_MS = 1500
   let pollTimer: ReturnType<typeof setTimeout> | null = null
+  let idleTimer: ReturnType<typeof setTimeout> | null = null
   let polling = false
 
   async function pollLoop() {
@@ -117,11 +118,14 @@
     polling = true
     pollLoop()
 
+    resetIdleTimer()
+
     return () => {
       polling = false
       if (pollTimer !== null) { clearTimeout(pollTimer); pollTimer = null }
-      if (discordInitialized) destroyRpc()
-      platformService.destroy()
+      if (idleTimer !== null) { clearTimeout(idleTimer); idleTimer = null }
+      if (discordInitialized) destroyRpc().catch(() => {})
+      platformService.destroy().catch(() => {})
     }
   })
 
@@ -146,7 +150,37 @@
     if (appState.status === 'booting') _splashDismissed = false
   })
 
-  function onIdleDismiss() { appState.idleSplash = false }
+  $effect(() => {
+    if (appState.status === 'ready') resetIdleTimer()
+  })
+
+  $effect(() => {
+    if (appState.status !== 'ready') return
+    // capture phase so events from any component — including modals — reset the timer
+    const onActivity = () => resetIdleTimer()
+    document.addEventListener('mousemove',   onActivity, true)
+    document.addEventListener('keydown',     onActivity, true)
+    document.addEventListener('touchstart',  onActivity, true)
+    document.addEventListener('click',       onActivity, true)
+    return () => {
+      document.removeEventListener('mousemove',   onActivity, true)
+      document.removeEventListener('keydown',     onActivity, true)
+      document.removeEventListener('touchstart',  onActivity, true)
+      document.removeEventListener('click',       onActivity, true)
+    }
+  })
+
+  function resetIdleTimer() {
+    if (idleTimer) clearTimeout(idleTimer)
+    appState.idleSplash = false
+    // read the setting live so changes take effect without a restart
+    const timeoutMs = (settingsState.settings.idleTimeoutMin ?? 5) * 60_000
+    idleTimer = setTimeout(() => {
+      if (appState.status === 'ready') appState.idleSplash = true
+    }, timeoutMs)
+  }
+
+  function onIdleDismiss() { appState.idleSplash = false; resetIdleTimer() }
 
   function onSplashRetry() {
     import('$lib/state/boot.svelte').then(({ retryBoot }) => {