batch4.1-5.1: dedup audit, archive 400 fix, sidebar Delete, landing-page enrichment, auto-name tool-call fix

- Fastify global empty-JSON-body parser fixes archive/unarchive/stop 400s
- Removed redundant local sessionEvents.emit at all 5+2 sites with server-side WS publishers; added dedupe guards in useSidebar/Workspace/Project handlers
- Sidebar session right-click adds Delete (destructive) with confirm Dialog
- Session.tsx navigates away on session_deleted/session_archived for the active session
- SessionLandingPage chat rows show message_count, effective_context_tokens, last_message_preview via LATERAL joins on GET /api/sessions/:id/chats
- Workspace.tsx pane drag-to-reorder using native HTML5 events (no new deps)
- CompactCard: Copy toast, Send-to-chat with target chat name, empty-state in share popover, Re-run button
- auto_name.ts: filter count gate and assistant-fetch by content <> '' so tool-call assistant rows don't trip the once-and-only-once guard
- Adds CLAUDE.md and apps/web/src/lib/format.ts

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

apps/web/src/components/MessageBubble.tsx

@@ -2,7 +2,7 @@ import { Children, cloneElement, isValidElement, useState } from 'react';
 import type { ReactElement, ReactNode } from 'react';
 import Markdown from 'react-markdown';
 import remarkGfm from 'remark-gfm';
-import { ChevronDown, ChevronRight, Copy, RefreshCw, Check, Share2 } from 'lucide-react';
+import { ChevronDown, ChevronRight, Copy, RefreshCw, Check, Share2, RotateCw } from 'lucide-react';
 import { toast } from 'sonner';
 import type { Chat, Message } from '@/api/types';
 import { api } from '@/api/client';
@@ -255,6 +255,7 @@ function CompactCard({ message, sessionChats }: { message: Message; sessionChats
   const [expanded, setExpanded] = useState(false);
   const [copied, setCopied] = useState(false);
   const [shareOpen, setShareOpen] = useState(false);
+  const [rerunning, setRerunning] = useState(false);
 
   const headerMatch = message.content.match(/^\[Context compacted — (\d+) messages summarized\]/);
   const headerText = headerMatch ? headerMatch[0] : 'Context compacted';
@@ -267,21 +268,34 @@ function CompactCard({ message, sessionChats }: { message: Message; sessionChats
       await navigator.clipboard.writeText(summaryText);
       setCopied(true);
       setTimeout(() => setCopied(false), 1200);
+      toast.success('Summary copied to clipboard');
     } catch {
       toast.error('Copy failed');
     }
   }
 
-  async function handleShareToChat(chatId: string) {
+  async function handleShareToChat(chat: Chat) {
     try {
-      await api.messages.send(chatId, summaryText);
-      toast.success('Summary sent to chat');
+      await api.messages.send(chat.id, summaryText);
+      toast.success(`Summary sent to ${chat.name ?? 'New chat'}`);
       setShareOpen(false);
     } catch (err) {
       toast.error(err instanceof Error ? err.message : 'Failed to share');
     }
   }
 
+  async function handleRerun() {
+    if (rerunning) return;
+    setRerunning(true);
+    try {
+      await api.chats.compact(message.chat_id);
+    } catch (err) {
+      toast.error(err instanceof Error ? err.message : 'Re-run failed');
+    } finally {
+      setRerunning(false);
+    }
+  }
+
   const otherChats = (sessionChats ?? []).filter(
     (c) => c.id !== message.chat_id && c.status === 'open'
   );
@@ -302,35 +316,51 @@ function CompactCard({ message, sessionChats }: { message: Message; sessionChats
           onClick={() => void handleCopy()}
           className="p-1 rounded hover:bg-muted text-muted-foreground"
           aria-label="Copy summary"
+          title="Copy summary"
         >
           {copied ? <Check size={12} /> : <Copy size={12} />}
         </button>
-        {otherChats.length > 0 && (
-          <div className="relative">
-            <button
-              type="button"
-              onClick={() => setShareOpen(!shareOpen)}
-              className="p-1 rounded hover:bg-muted text-muted-foreground"
-              aria-label="Send to chat"
-            >
-              <Share2 size={12} />
-            </button>
-            {shareOpen && (
-              <div className="absolute right-0 top-full mt-1 z-50 bg-popover border rounded-md shadow-md min-w-[160px] py-1">
-                {otherChats.map((c) => (
+        <div className="relative">
+          <button
+            type="button"
+            onClick={() => setShareOpen(!shareOpen)}
+            className="p-1 rounded hover:bg-muted text-muted-foreground"
+            aria-label="Send to chat"
+            title="Send to chat"
+          >
+            <Share2 size={12} />
+          </button>
+          {shareOpen && (
+            <div className="absolute right-0 top-full mt-1 z-50 bg-popover border rounded-md shadow-md min-w-[180px] py-1">
+              {otherChats.length === 0 ? (
+                <div className="px-3 py-1.5 text-xs text-muted-foreground">
+                  No other chats in this session
+                </div>
+              ) : (
+                otherChats.map((c) => (
                   <button
                     key={c.id}
                     type="button"
-                    onClick={() => void handleShareToChat(c.id)}
+                    onClick={() => void handleShareToChat(c)}
                     className="w-full text-left px-3 py-1.5 text-xs hover:bg-accent truncate"
                   >
                     {c.name ?? 'New chat'}
                   </button>
-                ))}
-              </div>
-            )}
-          </div>
-        )}
+                ))
+              )}
+            </div>
+          )}
+        </div>
+        <button
+          type="button"
+          onClick={() => void handleRerun()}
+          disabled={rerunning}
+          className="p-1 rounded hover:bg-muted text-muted-foreground disabled:opacity-40"
+          aria-label="Re-run compact"
+          title="Re-run compact"
+        >
+          <RotateCw size={12} className={rerunning ? 'animate-spin' : ''} />
+        </button>
       </div>
       {expanded && (
         <div className="px-3 pb-3 text-xs leading-relaxed text-muted-foreground whitespace-pre-wrap border-t pt-2">