fix: handle unsupported Share API gracefully

src/app/components/SpaceInvite.svelte

@@ -30,8 +30,17 @@
 
   const copyInvite = () => clip(invite)
 
-  const shareInvite = () => Share.share({url: invite})
+  const shareInvite = async () => {
+  if (!canShare) return
 
+  try {
+    await Share.share({url: invite})
+  } catch (e) {
+    console.error(e)
+  }
+}
+
+  let canShare = $state(false)
   let claim = $state("")
   let loading = $state(true)
 
@@ -45,6 +54,13 @@
   })
 
   onMount(async () => {
+  try {
+    const {value} = await Share.canShare()
+    canShare = value
+  } catch {
+    canShare = false
+  }
+
     const [[event]] = await Promise.all([
       request({
         relays: [url],
@@ -84,12 +100,14 @@
           <Field>
             {#snippet input()}
               <div class="flex w-full gap-2">
-                <Button 
-                  class="input input-bordered flex shrink-0 w-12 items-center justify-center p-0" 
-                  onclick={shareInvite}
-                >
-                  <Icon icon={NativeShare} />
-                </Button>
+                {#if canShare}
+                  <Button 
+                    class="input input-bordered flex shrink-0 w-12 items-center justify-center p-0" 
+                    onclick={shareInvite}
+                  >
+                    <Icon icon={NativeShare} />
+                  </Button>
+                {/if}
 
                 <label class="input input-bordered flex min-w-0 flex-1 items-center gap-2">
                   <Icon icon={LinkRound} class="shrink-0" />