feat(post): Vorlesen-Button (Web Speech API), nur wenn unterstützt

PostActions: 🔊 Vorlesen liest Artikeltext (Titel+Body, versteckte Elemente
gefiltert), Toggle Pause/Weiter + Stop, deutsche Stimme, satzweise, stoppt
bei Seitenwechsel. Button erscheint nur wenn speechSynthesis verfügbar.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/lib/components/PostActions.svelte

@@ -1,6 +1,6 @@
 <script lang="ts">
   import Icon from "@iconify/svelte";
-  import { onMount } from "svelte";
+  import { onMount, onDestroy } from "svelte";
   import "$lib/iconify-offline";
   import { env } from "$env/dynamic/public";
   import { useTranslate, T } from "$lib/translations";
@@ -156,6 +156,73 @@
   function print() {
     window.print();
   }
+
+  // ── Vorlesen (Web Speech API) ───────────────────────────────────────────
+  // Button erscheint nur, wenn der Browser Sprachausgabe unterstützt.
+  let canSpeak = $state(false);
+  let speaking = $state(false);
+  let paused = $state(false);
+  $effect(() => {
+    canSpeak = typeof window !== "undefined" && "speechSynthesis" in window;
+  });
+
+  function getArticleText(): string {
+    const art = document.querySelector("article");
+    if (!art) return "";
+    const clone = art.cloneNode(true) as HTMLElement;
+    clone
+      .querySelectorAll("[hidden], .sr-only, script, style, nav, figure figcaption")
+      .forEach((n) => n.remove());
+    return (clone.textContent ?? "").replace(/\s+/g, " ").trim();
+  }
+
+  function speak() {
+    const synth = window.speechSynthesis;
+    synth.cancel();
+    const text = getArticleText();
+    if (!text) return;
+    // In Sätze zerlegen — manche Engines schneiden lange Utterances ab.
+    const chunks = text.match(/[^.!?]+[.!?]*(?:\s|$)/g) ?? [text];
+    const voice =
+      synth.getVoices().find((v) => v.lang?.toLowerCase().startsWith("de")) ?? null;
+    chunks.forEach((c, i) => {
+      const u = new SpeechSynthesisUtterance(c.trim());
+      u.lang = "de-DE";
+      if (voice) u.voice = voice;
+      if (i === chunks.length - 1)
+        u.onend = () => {
+          speaking = false;
+          paused = false;
+        };
+      synth.speak(u);
+    });
+    speaking = true;
+    paused = false;
+  }
+
+  function toggleSpeak() {
+    const synth = window.speechSynthesis;
+    if (!speaking) {
+      speak();
+    } else if (paused) {
+      synth.resume();
+      paused = false;
+    } else {
+      synth.pause();
+      paused = true;
+    }
+  }
+
+  function stopSpeak() {
+    window.speechSynthesis.cancel();
+    speaking = false;
+    paused = false;
+  }
+
+  onDestroy(() => {
+    if (typeof window !== "undefined" && "speechSynthesis" in window)
+      window.speechSynthesis.cancel();
+  });
 </script>
 
 <!--
@@ -194,6 +261,28 @@
         />
       </button>
     {/if}
+    {#if canSpeak}
+      <button
+        type="button"
+        onclick={toggleSpeak}
+        class="inline-flex items-center px-2.5 py-1 text-stein-600 hover:bg-stein-50 hover:text-stein-900 transition-colors {speaking && !paused ? 'text-wald-700!' : ''}"
+        aria-label={!speaking ? "Vorlesen" : paused ? "Weiterlesen" : "Pause"}
+        title={!speaking ? "Vorlesen" : paused ? "Weiterlesen" : "Pause"}
+      >
+        <Icon icon={!speaking ? "lucide:volume-2" : paused ? "lucide:play" : "lucide:pause"} class="size-3.5" />
+      </button>
+      {#if speaking}
+        <button
+          type="button"
+          onclick={stopSpeak}
+          class="inline-flex items-center px-2.5 py-1 text-stein-600 hover:bg-stein-50 hover:text-stein-900 transition-colors"
+          aria-label="Vorlesen stoppen"
+          title="Vorlesen stoppen"
+        >
+          <Icon icon="lucide:square" class="size-3.5" />
+        </button>
+      {/if}
+    {/if}
     <button
       type="button"
       onclick={copyLink}

src/lib/iconify-lucide-subset.generated.json

@@ -69,9 +69,18 @@
     "menu": {
       "body": "<path fill=\"none\" stroke=\"currentColor\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M4 5h16M4 12h16M4 19h16\"/>"
     },
+    "heart-handshake": {
+      "body": "<path fill=\"none\" stroke=\"currentColor\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M19.414 14.414C21 12.828 22 11.5 22 9.5a5.5 5.5 0 0 0-9.591-3.676a.6.6 0 0 1-.818.001A5.5 5.5 0 0 0 2 9.5c0 2.3 1.5 4 3 5.5l5.535 5.362a2 2 0 0 0 2.879.052a2.12 2.12 0 0 0-.004-3a2.124 2.124 0 1 0 3-3a2.124 2.124 0 0 0 3.004 0a2 2 0 0 0 0-2.828l-1.881-1.882a2.41 2.41 0 0 0-3.409 0l-1.71 1.71a2 2 0 0 1-2.828 0a2 2 0 0 1 0-2.828l2.823-2.762\"/>"
+    },
+    "calendar-plus": {
+      "body": "<path fill=\"none\" stroke=\"currentColor\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M16 19h6M16 2v4m3 10v6m2-9.402V6a2 2 0 0 0-2-2H5a2 2 0 0 0-2 2v14a2 2 0 0 0 2 2h8.5M3 10h18M8 2v4\"/>"
+    },
     "message-circle": {
       "body": "<path fill=\"none\" stroke=\"currentColor\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M2.992 16.342a2 2 0 0 1 .094 1.167l-1.065 3.29a1 1 0 0 0 1.236 1.168l3.413-.998a2 2 0 0 1 1.099.092a10 10 0 1 0-4.777-4.719\"/>"
     },
+    "square": {
+      "body": "<rect width=\"18\" height=\"18\" x=\"3\" y=\"3\" fill=\"none\" stroke=\"currentColor\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" rx=\"2\"/>"
+    },
     "printer": {
       "body": "<g fill=\"none\" stroke=\"currentColor\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\"><path d=\"M6 18H4a2 2 0 0 1-2-2v-5a2 2 0 0 1 2-2h16a2 2 0 0 1 2 2v5a2 2 0 0 1-2 2h-2M6 9V3a1 1 0 0 1 1-1h10a1 1 0 0 1 1 1v6\"/><rect width=\"12\" height=\"8\" x=\"6\" y=\"14\" rx=\"1\"/></g>"
     },
@@ -132,9 +141,6 @@
     "plus": {
       "body": "<path fill=\"none\" stroke=\"currentColor\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M5 12h14m-7-7v14\"/>"
     },
-    "calendar-plus": {
-      "body": "<path fill=\"none\" stroke=\"currentColor\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M16 19h6M16 2v4m3 10v6m2-9.402V6a2 2 0 0 0-2-2H5a2 2 0 0 0-2 2v14a2 2 0 0 0 2 2h8.5M3 10h18M8 2v4\"/>"
-    },
     "youtube": {
       "body": "<g fill=\"none\" stroke=\"currentColor\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\"><path d=\"M2.5 17a24.1 24.1 0 0 1 0-10a2 2 0 0 1 1.4-1.4a49.6 49.6 0 0 1 16.2 0A2 2 0 0 1 21.5 7a24.1 24.1 0 0 1 0 10a2 2 0 0 1-1.4 1.4a49.6 49.6 0 0 1-16.2 0A2 2 0 0 1 2.5 17\"/><path d=\"m10 15l5-3l-5-3z\"/></g>",
       "hidden": true