v3: allow users to edit dump title

src/App.css

@@ -128,6 +128,63 @@
   word-break: break-word;
 }
 
+.dump-title-view {
+  position: relative;
+  display: inline-flex;
+  align-items: baseline;
+  gap: 0.4rem;
+  border-radius: 6px;
+  max-width: 100%;
+}
+
+.dump-title-view--editable {
+  cursor: pointer;
+}
+
+.dump-title-view--editable:hover {
+  background: var(--color-surface);
+}
+
+.dump-title-edit-btn {
+  font-size: 0.85rem;
+  color: var(--color-muted);
+  opacity: 0;
+  transition: opacity 0.1s;
+  pointer-events: none;
+}
+
+.dump-title-view--editable:hover .dump-title-edit-btn {
+  opacity: 1;
+}
+
+.dump-title-editor {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  gap: 0.5rem;
+}
+
+.dump-title-input {
+  flex: 1;
+  min-width: 12rem;
+  padding: 0.4rem 0.6rem;
+  border-radius: 8px;
+  border: 2px solid var(--color-border);
+  background-color: var(--color-bg);
+  color: var(--color-text);
+  font-size: 1.25rem;
+  font-weight: 700;
+  font-family: "Saira", sans-serif;
+  outline: none;
+}
+
+.dump-title-error {
+  width: 100%;
+  margin: 0;
+  font-size: 0.85rem;
+  color: var(--color-danger);
+}
+
 .dump-comment {
   font-size: 1.05rem;
   line-height: 1.72;
@@ -254,6 +311,32 @@
   opacity: 0.6;
 }
 
+.dump-create-title-row {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+}
+
+.dump-create-title-row input {
+  flex: 1;
+}
+
+.dump-create-title-edit-btn {
+  background: none;
+  border: none;
+  cursor: pointer;
+  font-size: 1rem;
+  line-height: 1;
+  color: var(--color-muted);
+  border-radius: 4px;
+  padding: 0.4rem;
+  transition: color 0.15s;
+}
+
+.dump-create-title-edit-btn:hover {
+  color: var(--color-text);
+}
+
 /* ── New dump form ── */
 .dump-create-wrapper {
   width: 100%;