feat(workspace): add slash command link menu for internal notes and web links

frontend/src/features/workspace/WorkspaceView.tsx

@@ -26,6 +26,7 @@ import {
   Italic,
   Strikethrough,
   Link,
+  FileText,
   Table as TableIcon,
   Percent,
   Minus,
@@ -68,13 +69,17 @@ interface FolderTreeItem {
 }
 
 interface SlashCommandItem {
-  type: BlockType;
+  type?: BlockType;
+  action?: 'insert_link' | 'insert_note' | 'insert_weblink';
   label: string;
   desc: string;
   icon: string;
 }
 
 const SLASH_COMMANDS: SlashCommandItem[] = [
+  { action: 'insert_link', label: '/link', desc: 'Webseite oder Notiz verlinken', icon: '🔗' },
+  { action: 'insert_note', label: '/notiz', desc: 'Notiz verlinken [[Notiz]]', icon: '📄' },
+  { action: 'insert_weblink', label: '/web', desc: 'Externe Webseite verlinken [Name](url)', icon: '🌐' },
   { type: 'todo', label: '/todo', desc: 'Aufgabe mit Checkbox', icon: '☑️' },
   { type: 'h1', label: '/h1', desc: 'Große Überschrift', icon: 'H1' },
   { type: 'h2', label: '/h2', desc: 'Abschnitts-Überschrift', icon: 'H2' },
@@ -135,6 +140,13 @@ export const WorkspaceView: React.FC<WorkspaceViewProps> = ({
   const [slashSelectedIndex, setSlashSelectedIndex] = useState(0);
   const slashMenuRef = useRef<HTMLDivElement | null>(null);
 
+  // Link Insertion Modal state (/link, /notiz, /web)
+  const [linkModalBlockId, setLinkModalBlockId] = useState<string | null>(null);
+  const [linkModalTab, setLinkModalTab] = useState<'note' | 'web'>('note');
+  const [linkSearchQuery, setLinkSearchQuery] = useState('');
+  const [linkWebTitle, setLinkWebTitle] = useState('');
+  const [linkWebUrl, setLinkWebUrl] = useState('');
+
   // Drag and Drop reordering state for blocks
   const [draggingBlockId, setDraggingBlockId] = useState<string | null>(null);
 
@@ -1154,7 +1166,7 @@ export const WorkspaceView: React.FC<WorkspaceViewProps> = ({
         e.preventDefault();
         const selected = filteredSlashCommands[slashSelectedIndex];
         if (selected) {
-          applySlashCommand(block.id, selected.type);
+          applySlashCommand(block.id, selected);
         }
         return;
       }
@@ -1236,17 +1248,9 @@ export const WorkspaceView: React.FC<WorkspaceViewProps> = ({
     }
   }, [slashSelectedIndex, slashBlockId]);
 
-  const applySlashCommand = (blockId: string, type: BlockType) => {
-    if (isReadOnly || !selectedDoc) return;
-    const block = selectedDoc.blocks.find((b) => b.id === blockId);
-    if (!block) return;
-    const cleanContent = block.content.replace(/\/([a-z0-9]*)$/i, '').trim();
-    updateBlock(blockId, { type, content: cleanContent, checked: type === 'todo' ? false : undefined });
-    setSlashBlockId(null);
-    setSlashSearch('');
-
-    // Re-focus immediately into the block's text field and position cursor at end
-    const focusBlock = () => {
+  const focusBlock = (blockId: string) => {
+    setLastFocusedBlockId(blockId);
+    const tryFocus = () => {
       const el = blockInputRefs.current[blockId];
       if (el) {
         el.focus();
@@ -1259,14 +1263,79 @@ export const WorkspaceView: React.FC<WorkspaceViewProps> = ({
       return false;
     };
 
-    setLastFocusedBlockId(blockId);
     setTimeout(() => {
-      if (!focusBlock()) {
-        setTimeout(focusBlock, 30);
+      if (!tryFocus()) {
+        setTimeout(tryFocus, 30);
       }
     }, 20);
   };
 
+  const applySlashCommand = (blockId: string, cmd: SlashCommandItem) => {
+    if (isReadOnly || !selectedDoc) return;
+    const block = selectedDoc.blocks.find((b) => b.id === blockId);
+    if (!block) return;
+    const cleanContent = block.content.replace(/\/([a-z0-9]*)$/i, '').trim();
+
+    setSlashBlockId(null);
+    setSlashSearch('');
+
+    if (cmd.action) {
+      updateBlock(blockId, { content: cleanContent });
+      setLinkModalBlockId(blockId);
+      setLinkModalTab(cmd.action === 'insert_weblink' ? 'web' : 'note');
+      setLinkSearchQuery('');
+      setLinkWebTitle('');
+      setLinkWebUrl('');
+      return;
+    }
+
+    if (cmd.type) {
+      updateBlock(blockId, { type: cmd.type, content: cleanContent, checked: cmd.type === 'todo' ? false : undefined });
+      focusBlock(blockId);
+    }
+  };
+
+  const handleInsertNoteLink = (docTitle: string) => {
+    if (!linkModalBlockId || !selectedDoc) return;
+    const block = selectedDoc.blocks.find((b) => b.id === linkModalBlockId);
+    if (block) {
+      const space = block.content && !block.content.endsWith(' ') ? ' ' : '';
+      const newContent = `${block.content}${space}[[${docTitle}]] `;
+      updateBlock(linkModalBlockId, { content: newContent });
+    }
+    const targetBlockId = linkModalBlockId;
+    setLinkModalBlockId(null);
+    focusBlock(targetBlockId);
+  };
+
+  const handleInsertWebLink = () => {
+    if (!linkModalBlockId || !selectedDoc) return;
+    const block = selectedDoc.blocks.find((b) => b.id === linkModalBlockId);
+    let title = linkWebTitle.trim();
+    let url = linkWebUrl.trim();
+    if (!url) return;
+    if (!/^https?:\/\//i.test(url)) {
+      url = `https://${url}`;
+    }
+    if (!title) {
+      try {
+        title = new URL(url).hostname;
+      } catch {
+        title = url;
+      }
+    }
+    if (block) {
+      const space = block.content && !block.content.endsWith(' ') ? ' ' : '';
+      const newContent = `${block.content}${space}[${title}](${url}) `;
+      updateBlock(linkModalBlockId, { content: newContent });
+    }
+    const targetBlockId = linkModalBlockId;
+    setLinkModalBlockId(null);
+    setLinkWebTitle('');
+    setLinkWebUrl('');
+    focusBlock(targetBlockId);
+  };
+
   const getDirectChildTodos = (blocks: DocumentBlock[], parentIndex: number): DocumentBlock[] => {
     const parent = blocks[parentIndex];
     if (!parent) return [];
@@ -1423,9 +1492,9 @@ export const WorkspaceView: React.FC<WorkspaceViewProps> = ({
     URL.revokeObjectURL(url);
   };
 
-  // Helper to render text with clickable Wiki-Links and Hashtags
+  // Helper to render text with clickable Wiki-Links, Web-Links and Hashtags
   const renderFormattedText = (text: string) => {
-    const parts = text.split(/(\[\[.*?\]\]|#[a-zA-Z0-9äöüÄÖÜß_-]+)/g);
+    const parts = text.split(/(\[\[.*?\]\]|\[.*?\]\(https?:\/\/[^\s)]+\)|#[a-zA-Z0-9äöüÄÖÜß_-]+)/g);
     return parts.map((part, i) => {
       if (part.startsWith('[[') && part.endsWith(']]')) {
         const linkTitle = part.slice(2, -2).trim();
@@ -1454,6 +1523,26 @@ export const WorkspaceView: React.FC<WorkspaceViewProps> = ({
           </span>
         );
       }
+      const webMatch = part.match(/^\[(.*?)\]\((https?:\/\/[^\s)]+)\)$/);
+      if (webMatch) {
+        const title = webMatch[1] || webMatch[2];
+        const url = webMatch[2];
+        return (
+          <a
+            key={i}
+            href={url}
+            target="_blank"
+            rel="noopener noreferrer"
+            onClick={(e) => e.stopPropagation()}
+            className="inline-flex items-center gap-1 px-1.5 py-0.2 mx-0.5 bg-sky-500/10 border border-sky-500/30 text-sky-500 dark:text-sky-400 hover:bg-sky-500/20 text-xs font-medium rounded-btn transition-colors"
+            title={`Öffne: ${url}`}
+          >
+            <span>🌐</span>
+            <span>{title}</span>
+            <ExternalLink className="w-2.5 h-2.5 opacity-60" />
+          </a>
+        );
+      }
       if (part.startsWith('#') && part.length > 1) {
         const tagWord = part.slice(1);
         return (
@@ -2548,7 +2637,7 @@ export const WorkspaceView: React.FC<WorkspaceViewProps> = ({
                                   </button>
                                 )}
                               </div>
-                              {(block.content.includes('[[') || block.content.includes('#')) && (
+                              {(block.content.includes('[[') || block.content.includes('#') || (block.content.includes('[') && block.content.includes(']('))) && (
                                 <div className="text-xs text-muted flex flex-wrap items-center gap-1 pt-0.5 pl-6">
                                   {renderFormattedText(block.content)}
                                 </div>
@@ -2754,7 +2843,7 @@ export const WorkspaceView: React.FC<WorkspaceViewProps> = ({
                                   isReadOnly ? 'cursor-default' : ''
                                 }`}
                               />
-                              {(block.content.includes('[[') || block.content.includes('#')) && (
+                              {(block.content.includes('[[') || block.content.includes('#') || (block.content.includes('[') && block.content.includes(']('))) && (
                                 <div className="text-xs text-muted flex flex-wrap items-center gap-1 pt-0.5">
                                   {renderFormattedText(block.content)}
                                 </div>
@@ -2771,11 +2860,11 @@ export const WorkspaceView: React.FC<WorkspaceViewProps> = ({
                               <div ref={slashMenuRef} className="relative max-h-48 overflow-y-auto space-y-0.5">
                                 {filteredSlashCommands.map((cmd, idx) => (
                                   <button
-                                    key={cmd.type}
+                                    key={cmd.label || idx}
                                     type="button"
                                     data-slash-index={idx}
                                     onMouseDown={(e) => e.preventDefault()}
-                                    onClick={() => applySlashCommand(block.id, cmd.type)}
+                                    onClick={() => applySlashCommand(block.id, cmd)}
                                     className={`w-full text-left px-2 py-1.5 rounded-btn text-xs flex items-center justify-between transition-colors ${
                                       slashSelectedIndex === idx
                                         ? 'bg-accent text-on-accent'
@@ -3436,6 +3525,220 @@ export const WorkspaceView: React.FC<WorkspaceViewProps> = ({
           </div>
         </div>
       )}
+
+      {/* LINK INSERTION MODAL (/link, /notiz, /web) */}
+      {linkModalBlockId && (
+        <div
+          className="fixed inset-0 z-50 flex items-center justify-center p-4 bg-black/60 backdrop-blur-xs"
+          onClick={() => {
+            const blockId = linkModalBlockId;
+            setLinkModalBlockId(null);
+            if (blockId) focusBlock(blockId);
+          }}
+        >
+          <div
+            className="bg-panel border border-border rounded-xl shadow-panel w-full max-w-md overflow-hidden animate-in fade-in zoom-in-95 duration-150"
+            onClick={(e) => e.stopPropagation()}
+          >
+            {/* Modal Header */}
+            <div className="flex items-center justify-between px-4 py-3 border-b border-border">
+              <div className="flex items-center gap-2">
+                <div className="p-1.5 rounded-btn bg-accent/15 text-accent">
+                  <ExternalLink className="w-4 h-4" />
+                </div>
+                <h3 className="text-sm font-semibold text-main">Link einfügen</h3>
+              </div>
+              <button
+                type="button"
+                onClick={() => {
+                  const blockId = linkModalBlockId;
+                  setLinkModalBlockId(null);
+                  if (blockId) focusBlock(blockId);
+                }}
+                className="p-1 text-faint hover:text-main rounded-btn transition-colors cursor-pointer"
+              >
+                <X className="w-4 h-4" />
+              </button>
+            </div>
+
+            {/* Tab Switcher: Notiz vs Webseite */}
+            <div className="flex border-b border-border bg-panel-elevated/40 p-1 gap-1">
+              <button
+                type="button"
+                onClick={() => setLinkModalTab('note')}
+                className={`flex-1 py-1.5 px-3 rounded-btn text-xs font-medium flex items-center justify-center gap-1.5 transition-colors cursor-pointer ${
+                  linkModalTab === 'note'
+                    ? 'bg-panel text-main shadow-xs font-semibold'
+                    : 'text-muted hover:text-main'
+                }`}
+              >
+                <FileText className="w-3.5 h-3.5" />
+                <span>Notiz verlinken</span>
+              </button>
+              <button
+                type="button"
+                onClick={() => setLinkModalTab('web')}
+                className={`flex-1 py-1.5 px-3 rounded-btn text-xs font-medium flex items-center justify-center gap-1.5 transition-colors cursor-pointer ${
+                  linkModalTab === 'web'
+                    ? 'bg-panel text-main shadow-xs font-semibold'
+                    : 'text-muted hover:text-main'
+                }`}
+              >
+                <ExternalLink className="w-3.5 h-3.5" />
+                <span>Webseite verlinken</span>
+              </button>
+            </div>
+
+            {/* Tab Content */}
+            <div className="p-4">
+              {linkModalTab === 'note' ? (
+                <div className="space-y-3">
+                  <div className="relative">
+                    <Search className="w-4 h-4 absolute left-3 top-2.5 text-muted pointer-events-none" />
+                    <input
+                      type="text"
+                      autoFocus
+                      placeholder="Notiz nach Titel oder Ordner filtern..."
+                      value={linkSearchQuery}
+                      onChange={(e) => setLinkSearchQuery(e.target.value)}
+                      onKeyDown={(e) => {
+                        if (e.key === 'Escape') {
+                          const blockId = linkModalBlockId;
+                          setLinkModalBlockId(null);
+                          if (blockId) focusBlock(blockId);
+                        } else if (e.key === 'Enter') {
+                          const filtered = docs.filter(
+                            (d) =>
+                              d.title.toLowerCase().includes(linkSearchQuery.toLowerCase()) ||
+                              (d.folderPath && d.folderPath.toLowerCase().includes(linkSearchQuery.toLowerCase()))
+                          );
+                          if (filtered.length > 0) {
+                            handleInsertNoteLink(filtered[0].title);
+                          }
+                        }
+                      }}
+                      className="input-field w-full pl-9 h-9 text-xs"
+                    />
+                  </div>
+
+                  <div className="max-h-60 overflow-y-auto space-y-1 divide-y divide-border/30">
+                    {docs
+                      .filter(
+                        (d) =>
+                          !linkSearchQuery.trim() ||
+                          d.title.toLowerCase().includes(linkSearchQuery.toLowerCase()) ||
+                          (d.folderPath && d.folderPath.toLowerCase().includes(linkSearchQuery.toLowerCase()))
+                      )
+                      .slice(0, 20)
+                      .map((d) => (
+                        <button
+                          key={d.id}
+                          type="button"
+                          onClick={() => handleInsertNoteLink(d.title)}
+                          className="w-full text-left px-2.5 py-2 rounded-btn text-xs hover:bg-panel-elevated flex items-center justify-between gap-2 transition-colors cursor-pointer group"
+                        >
+                          <div className="flex items-center gap-2 min-w-0">
+                            <span className="text-base flex-shrink-0">{d.icon || '📄'}</span>
+                            <div className="min-w-0">
+                              <div className="font-medium text-main truncate group-hover:text-accent">
+                                {d.title}
+                              </div>
+                              {d.folderPath && (
+                                <div className="text-[10px] text-faint truncate">
+                                  {d.folderPath}
+                                </div>
+                              )}
+                            </div>
+                          </div>
+                          <span className="text-[10px] text-faint group-hover:text-accent flex-shrink-0 font-mono">
+                            [[{d.title}]]
+                          </span>
+                        </button>
+                      ))}
+
+                    {docs.filter(
+                      (d) =>
+                        !linkSearchQuery.trim() ||
+                        d.title.toLowerCase().includes(linkSearchQuery.toLowerCase())
+                    ).length === 0 && (
+                      <div className="py-6 text-center text-xs text-faint">
+                        Keine passende Notiz gefunden
+                      </div>
+                    )}
+                  </div>
+                </div>
+              ) : (
+                <form
+                  onSubmit={(e) => {
+                    e.preventDefault();
+                    handleInsertWebLink();
+                  }}
+                  className="space-y-3"
+                >
+                  <div className="space-y-1">
+                    <label className="text-[11px] font-medium text-muted">Titel / Name der Verlinkung</label>
+                    <input
+                      type="text"
+                      autoFocus
+                      placeholder="z.B. Wikipedia oder Referenzseite"
+                      value={linkWebTitle}
+                      onChange={(e) => setLinkWebTitle(e.target.value)}
+                      onKeyDown={(e) => {
+                        if (e.key === 'Escape') {
+                          const blockId = linkModalBlockId;
+                          setLinkModalBlockId(null);
+                          if (blockId) focusBlock(blockId);
+                        }
+                      }}
+                      className="input-field w-full h-9 text-xs"
+                    />
+                  </div>
+
+                  <div className="space-y-1">
+                    <label className="text-[11px] font-medium text-muted">Web-Adresse (URL) *</label>
+                    <input
+                      type="text"
+                      required
+                      placeholder="https://example.com"
+                      value={linkWebUrl}
+                      onChange={(e) => setLinkWebUrl(e.target.value)}
+                      onKeyDown={(e) => {
+                        if (e.key === 'Escape') {
+                          const blockId = linkModalBlockId;
+                          setLinkModalBlockId(null);
+                          if (blockId) focusBlock(blockId);
+                        }
+                      }}
+                      className="input-field w-full h-9 text-xs"
+                    />
+                  </div>
+
+                  <div className="pt-2 flex justify-end gap-2 border-t border-border">
+                    <button
+                      type="button"
+                      onClick={() => {
+                        const blockId = linkModalBlockId;
+                        setLinkModalBlockId(null);
+                        if (blockId) focusBlock(blockId);
+                      }}
+                      className="btn-action h-8 px-3 text-xs cursor-pointer"
+                    >
+                      Abbrechen
+                    </button>
+                    <button
+                      type="submit"
+                      disabled={!linkWebUrl.trim()}
+                      className="btn-primary h-8 px-4 text-xs font-medium cursor-pointer disabled:opacity-50"
+                    >
+                      Link einfügen
+                    </button>
+                  </div>
+                </form>
+              )}
+            </div>
+          </div>
+        </div>
+      )}
     </div>
   );
 };