feat: add download + copy file content to context menus and editor

- Add /api/pages/{id}/download and /api/pages/{id}/file-content endpoints
- Add Download + Copy content to shared context menu (_ctx_menu.html)
- Wire handlers in local-workspace and library context menus
- Add Download + Copy content to editor '...' menu for file pages
- Multi-block selection copy/cut/paste with Ctrl+C/X/V shortcuts
- Align page title with blocks start (CSS pseudo-element offset)

app/templates/_page_editor_scripts.html

@@ -781,6 +781,9 @@
       if(act==='turn'){var m=document.getElementById('blockMenu');if(m){var r=m.getBoundingClientRect();_blockTurnMenuOpen(r.right+4,r.top,bid||'');}return;}
       if(act==='duplicate'){E.duplicateBlock(idx);}
       else if(act==='copy-link'){E.copyBlockLink(bid||'');}
+      else if(act==='copy-blocks'){E.copySelectedBlocks();}
+      else if(act==='cut-blocks'){E.cutSelectedBlocks();}
+      else if(act==='paste-blocks'){E.pasteBlocks();}
       else if(act==='move-to'){_blockMoveToOpen(idx);}
       else if(act==='delete'){E.deleteSelected(idx);}
       else if(act==='color'){var key=t.getAttribute('data-color-key'),val=t.getAttribute('data-color-val');E.setBlockColor(idx,key,val);}
@@ -800,6 +803,11 @@
         +'<div class="bm-sep"></div>'
         +'<div class="bm-item" data-bm-act="duplicate" data-bid="'+b.id+'"><span class="bm-ico">▣</span>Duplicate <span class="bm-hint">'+(_rtMac()?'⌘D':'Ctrl+D')+'</span></div>'
         +'<div class="bm-item" data-bm-act="copy-link" data-bid="'+b.id+'"><span class="bm-ico">🔗</span>Copy link to block</div>'
+        +'<div class="bm-sep"></div>'
+        +'<div class="bm-item" data-bm-act="copy-blocks" data-bid="'+b.id+'"><span class="bm-ico">⎘</span>Copy blocks <span class="bm-hint">'+(_rtMac()?'⌘C':'Ctrl+C')+'</span></div>'
+        +'<div class="bm-item" data-bm-act="cut-blocks" data-bid="'+b.id+'"><span class="bm-ico">✂</span>Cut blocks <span class="bm-hint">'+(_rtMac()?'⌘X':'Ctrl+X')+'</span></div>'
+        +'<div class="bm-item" data-bm-act="paste-blocks" data-bid="'+b.id+'"><span class="bm-ico">⎘</span>Paste blocks <span class="bm-hint">'+(_rtMac()?'⌘V':'Ctrl+V')+'</span></div>'
+        +'<div class="bm-sep"></div>'
         +'<div class="bm-item" data-bm-act="move-to" data-bid="'+b.id+'"><span class="bm-ico">↪</span>Move to…</div>'
         +'<div class="bm-sep"></div>'
         +'<div class="bm-colors"><div class="bm-colors-label">Text</div><div class="bm-swatches">'+colorsText+'</div></div>'
@@ -1245,6 +1253,12 @@ replaceBlock(idx,type){const b=this.blocks[idx];if(!b)return;this.sync();this.pu
         setBlockColor(idx,key,val){if(idx<0||idx>=this.blocks.length)return;const targets=this._blockTargets(idx);const v=(!val||val==='default')?null:val;this.sync();this.pushHistory();targets.forEach(i=>{const b=this.blocks[i];if(!b)return;if(!b.style)b.style={};if(v==null)delete b.style[key];else b.style[key]=v;});this.dirty=true;this.autoSave();this.render();_rtSync();_selClear();},
         copyBlockLink(bid){const url=window.location.origin+window.location.pathname+'#fdblk-'+bid;if(navigator.clipboard&&navigator.clipboard.writeText){navigator.clipboard.writeText(url).then(()=>this.showToast('Lien du bloc copié')).catch(()=>this.showToast('Copie impossible','error'));}else{this.showToast(url,'error');}},
         deleteSelected(idx){const indices=_selIndicesSorted();if(indices.length<=1)return this.removeBlock(idx);this.sync();this.pushHistory();const keep=this.blocks.filter((b,i)=>indices.indexOf(i)<0);this.blocks=keep.length?keep:[this.mkB('paragraph','')];const fi=Math.min(idx,this.blocks.length-1);this.dirty=true;this.autoSave();this.render();_rtSync();_selClear();setTimeout(()=>{const el=this.getEl(this.blocks[fi]?.id);if(el){el.focus();ce(el);}},60);},
+        // ── v5.11: Copy / Cut / Paste selected blocks ──
+        _blocksToMarkdown(blocks){return blocks.map(blocksToMarkdown).join('\n\n');},
+        copySelectedBlocks(){const indices=_selIndicesSorted();if(!indices.length)return;const selected=indices.map(i=>this.blocks[i]).filter(Boolean);if(!selected.length)return;const md=this._blocksToMarkdown(selected);if(navigator.clipboard&&navigator.clipboard.writeText){navigator.clipboard.writeText(md).then(()=>this.showToast('Blocs copiés')).catch(()=>this.showToast('Copie impossible','error'));}else{this.showToast(md,'error');}},
+        cutSelectedBlocks(){const indices=_selIndicesSorted();if(!indices.length)return;this.sync();this.pushHistory();const selected=indices.map(i=>this.blocks[i]).filter(Boolean);if(!selected.length)return;const md=this._blocksToMarkdown(selected);if(navigator.clipboard&&navigator.clipboard.writeText){navigator.clipboard.writeText(md).then(()=>{});}this.blocks=this.blocks.filter((b,i)=>indices.indexOf(i)<0);if(!this.blocks.length)this.blocks=[this.mkB('paragraph','')];this.dirty=true;this.autoSave();this.render();_rtSync();_selClear();this.showToast('Blocs coupés');},
+        async pasteBlocks(){const idx=this._focusedIdx();if(idx<0)return;try{const text=await navigator.clipboard.readText();if(!text||!text.trim())return;const parsed=this.md2b(text);if(!parsed.length)return;this.sync();this.pushHistory();this.blocks.splice(idx+1,0,...parsed);this.dirty=true;this.autoSave();this.render();_rtSync();this._focusBid(parsed[parsed.length-1].id);_selClear();}catch(e){if(e.name==='NotAllowedError'){this.showToast('Permission presse-papier refusée');}else{this.showToast('Coller impossible','error');}},
+        _focusedIdx(){const a=this.getActiveBlock();return a?a.idx:-1;},
         async moveBlockToPage(idx,pageId){if(idx<0||idx>=this.blocks.length||pageId===this.pid)return;this.sync();this.pushHistory();const block=this.blocks[idx];const self=this;const csrf=document.cookie.match(/csrf_token=([^;]+)/);this.showToast('Déplacement du bloc…');try{const r=await fetch(`/board/api/pages/${pageId}`,{credentials:'same-origin'});const d=await r.json();let tblocks=[];if(d.content_format==='blocks'&&d.content){try{tblocks=JSON.parse(d.content);}catch(e){tblocks=[];}}tblocks.push(block);await fetch(`/board/api/pages/${pageId}/blocks`,{method:'POST',headers:{'Content-Type':'application/json','X-CSRF-Token':csrf?csrf[1]:''},body:JSON.stringify({title:d.title||'',blocks:tblocks})});
           if(this.blocks.length<=1){this.blocks[0]=this.mkB('paragraph','');}else{this.blocks.splice(idx,1);}this.dirty=true;this.autoSave();this.render();_rtSync();_selClear();this.showToast('Bloc déplacé');
         }catch(e){this.showToast('Échec du déplacement','error');}},
@@ -1558,6 +1572,8 @@ applyAIBlocks(text){
             .catch(function(){ self.showToast('Move failed'); });
         },
         deletePage(){this.moreOpen=false;if(!confirm('Move to Trash?'))return;const csrf=document.cookie.match(/csrf_token=([^;]+)/);fetch(`/board/api/pages/${this.pid}/trash`,{method:'POST',headers:{'X-CSRF-Token':csrf?csrf[1]:''}}).then(()=>{window.location.href='/';}).catch(()=>{window.showToast('Failed','error');});},
+        downloadFile(){this.moreOpen=false;if(!this.fileUrl)return;var a=document.createElement('a');a.href=this.fileUrl;a.download='';document.body.appendChild(a);a.click();document.body.removeChild(a);this.showToast('Download started','success');},
+        async copyFileContent(){this.moreOpen=false;if(!this.fileUrl)return;try{var r=await fetch('/api/pages/'+this.pid+'/file-content');var d=await r.json();if(d.ok&&d.content!==undefined){await navigator.clipboard.writeText(d.content);this.showToast('Content copied to clipboard','success');}else{this.showToast('Not a text file','error');}}catch(e){this.showToast('Copy failed','error');}},
 
         // ── v4.6.0 / v5.3.0: Get Started actions — Database (template picker) ──
         dbTplOpen:false, dbTplLoading:false, dbTemplates:[], dbTplTargetIdx:-1,
@@ -1645,7 +1661,7 @@ applyAIBlocks(text){
           }
         },
 
-        onKd(e){
+        async onKd(e){
           const ab=this.getActiveBlock();if(!ab)return;
           const{el,bid,idx}=ab;const block=this.blocks[idx];if(!block)return;
           if(SM.isOpen){
@@ -1690,6 +1706,20 @@ applyAIBlocks(text){
             if(e.key.toLowerCase()==='z'){e.preventDefault();if(e.shiftKey)this.redo();else this.undo();return;}
             if(e.key.toLowerCase()==='y'){e.preventDefault();this.redo();return;}
             if(e.key.toLowerCase()==='d'){e.preventDefault();const ab2=this.getActiveBlock();if(ab2)this.duplicateBlock(ab2.idx);return;}
+            if(e.key.toLowerCase()==='c'){
+              e.preventDefault();
+              const sel=_selIndicesSorted();
+              if(sel.length>0){this.copySelectedBlocks();return;}
+            }
+            if(e.key.toLowerCase()==='x'){
+              e.preventDefault();
+              const sel=_selIndicesSorted();
+              if(sel.length>0){this.cutSelectedBlocks();return;}
+            }
+            if(e.key.toLowerCase()==='v'){
+              e.preventDefault();
+              await this.pasteBlocks();return;
+            }
             const m={b:'bold',i:'italic',u:'underline'};if(m[e.key]){e.preventDefault();document.execCommand(m[e.key]);this.dirty=true;this.autoSave();}}
           if(e.key==='Tab'&&block.type==='code'){e.preventDefault();document.execCommand('insertText',false,'  ');}
           this.dirty=true;this.autoSave();