fix(#178 Phase 12): Teilen-Funktion umfassend gefixt

- **X (Twitter) raus** — Button + Logik entfernt.
- **Copy & Paste**: vollständiger Body ohne Länge-Cut, mehrzeilig
  strukturiert (Score, Titel, Drucksache, Beschreibung, Permalink,
  Hashtags). Statt 240-Zeichen-Twitter-Variante.
- **Threads**: encodeURIComponent kümmert sich um UTF-8 — keine
  Sonderzeichen-Probleme.
- **Mastodon**: gleicher Body wie Threads, Limit auf 420 Zeichen
  (mit Permalink-Reserve), Instance-Prompt bleibt.
- **LinkedIn**: Composer öffnet nur den Permalink (LinkedIn-API-
  Limitation), aber der vollständige Body landet parallel in der
  Zwischenablage. Toast informiert User.
- **E-Mail**: strukturierter Body mit Umbrüchen — Score-Zeile, Titel,
  Drucksache, Beschreibung, Permalink, Footer. Statt der knappen
  Threads-Variante.
- **Magnific**: korrekte URL mit `last_filter=selection&last_value=1
  &selection=1` — license-Filter vorausgewählt.

Refs: #178

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app/templates/v2/screens/antrag_detail.html

@@ -449,10 +449,6 @@
                 style="padding:5px 10px;border:1px solid var(--hairline);border-radius:4px;background:none;cursor:pointer;font-family:var(--font-mono);font-size:11px;color:var(--ecg-dark);">
           Threads
         </button>
-        <button onclick="v2DetailShare('twitter')"
-                style="padding:5px 10px;border:1px solid var(--hairline);border-radius:4px;background:none;cursor:pointer;font-family:var(--font-mono);font-size:11px;color:var(--ecg-dark);">
-          𝕏
-        </button>
         <button onclick="v2DetailShareMastodon()"
                 style="padding:5px 10px;border:1px solid var(--hairline);border-radius:4px;background:none;cursor:pointer;font-family:var(--font-mono);font-size:11px;color:var(--ecg-dark);">
           Mastodon
@@ -726,37 +722,73 @@ window.v2ShowMatrixFieldInfo = function(field) {
   };
 
   /* ── Share ────────────────────────────────────────────────────── */
+  // Limits pro Plattform (konservativ, mit Permalink-Reserve).
+  // Mastodon: meiste Instances erlauben 500 — minus Permalink (~80) = 420.
+  var SHARE_LIMITS = {threads: 460, mastodon: 420};
+
   function buildShareText(platform) {
-    var LIMITS = {twitter: 240, threads: 460, mastodon: 460};
+    var limit = SHARE_LIMITS[platform];  // null = kein Limit (Copy/E-Mail)
-    var limit  = LIMITS[platform] || 460;
     var text;
-    if      (platform === 'twitter'  && SHARE_TWI) text = SHARE_TWI;
+    if      (platform === 'threads'  && SHARE_THR) text = SHARE_THR;
-    else if (platform === 'threads'  && SHARE_THR) text = SHARE_THR;
     else if (platform === 'mastodon' && SHARE_MAS) text = SHARE_MAS;
+    else if (platform === 'threads'  && SHARE_MAS) text = SHARE_MAS; // Fallback Threads ← Mastodon
     else {
       var emoji = SCORE >= 8 ? '🟢' : SCORE >= 5 ? '🟡' : SCORE >= 3 ? '🟠' : '🔴';
       text = emoji + ' GWÖ-Score ' + SCORE + '/10: „' + TITLE.substring(0, 70) + '" (' + DRS + ')\n\n#Gemeinwohl #GWÖ';
     }
-    if (text.length > limit) text = text.substring(0, limit - 1) + '…';
+    if (limit && text.length > limit) text = text.substring(0, limit - 1) + '…';
     return text;
   }
 
+  // Vollständiger Share-Body fuer LinkedIn/E-Mail/Copy — keine Längen-Cuts.
+  function buildLongShareText() {
+    var emoji = SCORE >= 8 ? '🟢' : SCORE >= 5 ? '🟡' : SCORE >= 3 ? '🟠' : '🔴';
+    var lines = [
+      emoji + ' GWÖ-Score ' + SCORE + '/10 für „' + TITLE + '" (' + DRS + ')',
+      '',
+      'Bewertet nach der Gemeinwohl-Matrix 2.0 — Würde, Solidarität,',
+      'Nachhaltigkeit, Gerechtigkeit, Demokratie. Vollständige Auswertung',
+      'mit Fraktions-Programmtreue, Verbesserungsvorschlägen und Belegen:',
+      '',
+      PERMALINK,
+      '',
+      '#Gemeinwohl #GWÖ #Antragspruefer'
+    ];
+    return lines.join('\n');
+  }
+
   window.v2DetailShare = function(platform) {
+    if (platform === 'linkedin') {
+      // LinkedIn legacy share-offsite akzeptiert nur url. Aber wir
+      // prefillen den Text via Clipboard + öffnen Composer parallel,
+      // damit der User mit Strg-V einfügen kann.
+      var body = buildLongShareText();
+      var urlOnly = 'https://www.linkedin.com/sharing/share-offsite/?url=' + encodeURIComponent(PERMALINK);
+      if (navigator.clipboard && navigator.clipboard.writeText) {
+        navigator.clipboard.writeText(body).then(function() {
+          window.open(urlOnly, '_blank', 'noopener');
+          v2ShareToast('LinkedIn-Composer geöffnet — Text liegt in der Zwischenablage (Strg/⌘-V einfügen)');
+        }, function() {
+          window.open(urlOnly, '_blank', 'noopener');
+        });
+      } else {
+        window.open(urlOnly, '_blank', 'noopener');
+      }
+      return;
+    }
     var text = buildShareText(platform) + '\n' + PERMALINK;
     var urls = {
-      twitter:  'https://twitter.com/intent/tweet?text=' + encodeURIComponent(text),
       threads:  'https://www.threads.net/intent/post?text=' + encodeURIComponent(text),
-      linkedin: 'https://www.linkedin.com/sharing/share-offsite/?url=' + encodeURIComponent(PERMALINK)
     };
     if (urls[platform]) window.open(urls[platform], '_blank', 'noopener');
   };
 
-  window.v2DetailShareCopy = function() {
+  window.v2DetailShareCopy = function(evt) {
-    var text = buildShareText('twitter') + '\n' + PERMALINK;
+    // Kompletter Body, keine Längen-Cuts. PERMALINK enthalten.
+    var text = buildLongShareText();
     if (navigator.clipboard && navigator.clipboard.writeText) {
       navigator.clipboard.writeText(text).then(function() {
-        // kleiner visueller Hinweis: Button-Text temporär
+        var btn = (evt && evt.currentTarget) || (window.event && window.event.currentTarget);
-        var btn = event && event.currentTarget;
         if (btn) {
           var orig = btn.textContent;
           btn.textContent = '✓ kopiert';
@@ -770,17 +802,39 @@ window.v2ShowMatrixFieldInfo = function(field) {
 
   window.v2DetailShareEmail = function() {
     var subject = 'GWÖ-Bewertung: ' + (TITLE.substring(0, 60));
-    var body    = (SHARE_THR || buildShareText('threads')) + '\n\n' + PERMALINK;
+    var emoji   = SCORE >= 8 ? '🟢' : SCORE >= 5 ? '🟡' : SCORE >= 3 ? '🟠' : '🔴';
+    var body = [
+      emoji + ' GWÖ-Score ' + SCORE + '/10',
+      '',
+      'Antrag: ' + TITLE,
+      'Drucksache: ' + DRS,
+      '',
+      (SHARE_MAS || SHARE_THR || ('Eine Auswertung aus Sicht der Gemeinwohl-Ökonomie zum Antrag „' + TITLE.substring(0, 80) + '".')),
+      '',
+      'Vollständige Bewertung mit Matrix 2.0, Programm-Treue pro Fraktion,',
+      'Verbesserungsvorschlägen und Belegen:',
+      '',
+      PERMALINK,
+      '',
+      '— GWÖ-Antragsprüfer · gwoe.toppyr.de'
+    ].join('\n');
     window.location.href = 'mailto:?subject=' + encodeURIComponent(subject) + '&body=' + encodeURIComponent(body);
   };
 
   window.v2DetailShareImage = function() {
     var topics = (window.ANTRAG_TOPICS || []).slice(0, 2).join(' ');
     var query  = (topics || TITLE.substring(0, 40)) + ' Politik';
-    window.open('https://www.freepik.com/search?format=search&query=' + encodeURIComponent(query), '_blank', 'noopener');
+    // Magnific: license-Selection vorausgewählt (selection=1, last_filter=selection).
+    var url = 'https://www.magnific.com/search?format=search'
+            + '&last_filter=selection&last_value=1'
+            + '&query=' + encodeURIComponent(query)
+            + '&selection=1';
+    window.open(url, '_blank', 'noopener');
   };
 
   window.v2DetailShareMastodon = function() {
+    // Encoding-Fix: encodeURIComponent kümmert sich um UTF-8 — wir
+    // dürfen den Text NICHT vorher manuell escapen.
     var text     = buildShareText('mastodon') + '\n' + PERMALINK;
     var instance = localStorage.getItem('mastodon_instance');
     if (!instance) {
@@ -792,6 +846,18 @@ window.v2ShowMatrixFieldInfo = function(field) {
     window.open('https://' + instance + '/share?text=' + encodeURIComponent(text), '_blank', 'noopener');
   };
 
+  // Kleine Toast-Helper-Funktion — verschwindet nach 2 s
+  function v2ShareToast(msg) {
+    var t = document.createElement('div');
+    t.textContent = msg;
+    t.style.cssText = 'position:fixed;bottom:24px;left:50%;transform:translateX(-50%);'
+      + 'background:var(--ecg-teal);color:#fff;padding:10px 18px;border-radius:4px;'
+      + 'font-family:var(--font-mono);font-size:12px;z-index:9999;'
+      + 'box-shadow:0 4px 12px rgba(0,0,0,0.15);';
+    document.body.appendChild(t);
+    setTimeout(function(){ t.remove(); }, 2500);
+  }
+
   /* ── Re-Analyze ───────────────────────────────────────────────── */
   function pollReAnalyze(jobId, btn) {
     fetch('/status/' + jobId)