Header now behaves like this:

- Left-click + drag on the header → moves the card (the title is now a span, so the drag handler always wins).
  - Right-click on the header → swaps to an input, auto-focused with text selected.
  - Enter or Escape or click outside → exits edit mode.
  - Empty title shows the dimmed placeholder (Note / Terminal) and overflowing titles get an ellipsis.

  Browser's native context menu is suppressed on the header via e.preventDefault(), but only there — right-clicking
  elsewhere is unaffected.

src/canvas/canvas.css

@@ -76,10 +76,20 @@
   font-family: inherit;
   font-size: inherit;
   padding: 0.15em 0;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.card-title--empty {
+  opacity: 0.35;
+}
+
+.card-title--editing {
   cursor: text;
 }
 
-.card-title::placeholder {
+.card-title--editing::placeholder {
   color: var(--text);
   opacity: 0.35;
 }

src/canvas/cards/CardHeader.tsx

@@ -1,4 +1,4 @@
-import React from "react";
+import React, { useEffect, useRef, useState } from "react";
 
 interface Props {
   title: string;
@@ -9,16 +9,45 @@ interface Props {
 }
 
 export function CardHeader({ title, placeholder, onTitleChange, onClose, dragProps }: Props) {
+  const [editing, setEditing] = useState(false);
+  const inputRef = useRef<HTMLInputElement>(null);
+
+  useEffect(() => {
+    if (editing && inputRef.current) {
+      inputRef.current.focus();
+      inputRef.current.select();
+    }
+  }, [editing]);
+
+  const beginEdit = (e: React.MouseEvent) => {
+    e.preventDefault();
+    setEditing(true);
+  };
+
   return (
-    <div className="card-header" {...dragProps}>
-      <input
-        className="card-title"
-        value={title}
-        placeholder={placeholder}
-        spellCheck={false}
-        onChange={(e) => onTitleChange(e.target.value)}
-        onPointerDown={(e) => e.stopPropagation()}
-      />
+    <div className="card-header" {...dragProps} onContextMenu={beginEdit}>
+      {editing ? (
+        <input
+          ref={inputRef}
+          className="card-title card-title--editing"
+          value={title}
+          placeholder={placeholder}
+          spellCheck={false}
+          onChange={(e) => onTitleChange(e.target.value)}
+          onBlur={() => setEditing(false)}
+          onKeyDown={(e) => {
+            if (e.key === "Enter" || e.key === "Escape") {
+              e.preventDefault();
+              setEditing(false);
+            }
+          }}
+          onPointerDown={(e) => e.stopPropagation()}
+        />
+      ) : (
+        <span className={`card-title ${title ? "" : "card-title--empty"}`}>
+          {title || placeholder}
+        </span>
+      )}
       <button
         type="button"
         className="card-close"