feat: add rename channel

src/components/Sidebar/Sidebar.css

@@ -365,3 +365,54 @@
 .app-root--sidebar-expanded .stage--with-sidebar {
   margin-left: var(--sidebar-width-expanded);
 }
+
+/* ---------- Item (editing state) ---------- */
+
+.sidebar-item--editing {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  gap: var(--sidebar-item-gap);
+
+  aspect-ratio: 1;
+  height: calc(var(--header-height) * 0.7);
+
+  border: none;
+
+  background: transparent;
+  padding: 0;
+}
+
+.sidebar-item-input {
+  width: 0;
+  flex: 1 1 auto;
+  min-width: 0;
+
+  appearance: none;
+  -webkit-appearance: none;
+  background: transparent;
+  border: none;
+  outline: none;
+  box-shadow: none;
+
+  text-align: center;
+
+  color: var(--text-primary);
+  font-family: var(--font-ui);
+  font-size: var(--font-sm);
+  font-weight: var(--font-weight-semibold);
+
+  opacity: 0;
+  max-width: 0;
+
+  transition:
+    opacity var(--dur-fast) var(--ease-standard),
+    max-width var(--dur-base) var(--ease-standard);
+}
+
+.sidebar-rail--expanded .sidebar-item-input {
+  width: auto;
+  opacity: 1;
+  max-width: 200px;
+  border: none;
+}

src/components/Sidebar/Sidebar.tsx

@@ -6,6 +6,7 @@ export type SidebarItem<T extends string = string> = {
   id: T;
   label: string;
   icon: React.ReactNode;
+  editable?: boolean;
 };
 
 export type SidebarAppOption = {
@@ -17,11 +18,75 @@ function SidebarButton<T extends string>({
   item,
   active,
   onSelect,
+  onRename,
 }: {
   item: SidebarItem<T>;
   active: boolean;
   onSelect: () => void;
+  onRename?: (name: string) => void;
 }) {
+  const [editing, setEditing] = useState(false);
+  const [inputValue, setInputValue] = useState(item.label);
+  const inputRef = useRef<HTMLInputElement>(null);
+
+  useEffect(() => {
+    if (!editing) setInputValue(item.label);
+  }, [item.label, editing]);
+
+  function startEditing(e: React.MouseEvent) {
+    e.stopPropagation();
+    if (!onRename) return;
+
+    setInputValue(item.label);
+    setEditing(true);
+
+    requestAnimationFrame(() => {
+      inputRef.current?.focus();
+      inputRef.current?.select();
+    });
+  }
+
+  function commitRename() {
+    setEditing(false);
+
+    const trimmed = inputValue.trim();
+
+    if (!trimmed || trimmed === item.label) {
+      setInputValue(item.label);
+      return;
+    }
+
+    onRename?.(trimmed);
+  }
+
+  function handleKeyDown(e: React.KeyboardEvent) {
+    if (e.key === 'Enter') inputRef.current?.blur();
+
+    if (e.key === 'Escape') {
+      setInputValue(item.label);
+      setEditing(false);
+    }
+  }
+
+  if (editing) {
+    return (
+      <div className="sidebar-item sidebar-item--editing">
+        <span className="sidebar-icon">{item.icon}</span>
+
+        <input
+          ref={inputRef}
+          className="sidebar-item-input"
+          value={inputValue}
+          maxLength={8}
+          onChange={(e) => setInputValue(e.target.value.slice(0, 8))}
+          onBlur={commitRename}
+          onKeyDown={handleKeyDown}
+          aria-label="Rename channel"
+        />
+      </div>
+    );
+  }
+
   return (
     <button
       onClick={onSelect}
@@ -31,7 +96,14 @@ function SidebarButton<T extends string>({
       className={'sidebar-item' + (active ? ' sidebar-item--active' : '')}
     >
       <span className="sidebar-icon">{item.icon}</span>
-      <span className="sidebar-label">{item.label}</span>
+
+      <span
+        className="sidebar-label"
+        onDoubleClick={onRename ? startEditing : undefined}
+        title={onRename ? `${item.label} (double click to rename)` : undefined}
+      >
+        {item.label}
+      </span>
     </button>
   );
 }
@@ -230,6 +302,7 @@ export function Sidebar<T extends string>({
   selectedAppId,
   onAppChange,
   onAppRename,
+  onItemRename,
   expanded,
   onToggle,
 }: {
@@ -241,6 +314,7 @@ export function Sidebar<T extends string>({
   selectedAppId?: string;
   onAppChange: (id: string) => void;
   onAppRename: (name: string) => void;
+  onItemRename?: (id: T, name: string) => void;
   expanded: boolean;
   onToggle: () => void;
 }) {
@@ -298,6 +372,9 @@ export function Sidebar<T extends string>({
             item={item}
             active={activeId === item.id}
             onSelect={() => onSelect(item.id)}
+            onRename={
+              item.editable && onItemRename ? (name) => onItemRename(item.id, name) : undefined
+            }
           />
         ))}
       </div>

src/features/dsp408/components/DSP408Panel/DSP408Panel.tsx

@@ -47,66 +47,18 @@ function DSP408Panel({ dsp, api }: { dsp: DSP408; api: DSP408Api }) {
     { id: 'delay', label: 'Delay', icon: <DelayIcon /> },
     { id: 'matrix', label: 'Matrix', icon: <MatrixIcon /> },
     { id: 'geq', label: 'Graphic Equalizer', icon: <SlidersVerticalIcon /> },
-    {
-      id: 'ina',
-      label: inputStates[InputChannel.InA].name,
-      icon: <TextIcon>In A</TextIcon>,
-    },
-    {
-      id: 'inb',
-      label: inputStates[InputChannel.InB].name,
-      icon: <TextIcon>In B</TextIcon>,
-    },
-    {
-      id: 'inc',
-      label: inputStates[InputChannel.InC].name,
-      icon: <TextIcon>In C</TextIcon>,
-    },
-    {
-      id: 'ind',
-      label: inputStates[InputChannel.InD].name,
-      icon: <TextIcon>In D</TextIcon>,
-    },
-    {
-      id: 'out1',
-      label: outputStates[OutputChannel.Out1].name,
-      icon: <TextIcon>Out 1</TextIcon>,
-    },
-    {
-      id: 'out2',
-      label: outputStates[OutputChannel.Out2].name,
-      icon: <TextIcon>Out 2</TextIcon>,
-    },
-    {
-      id: 'out3',
-      label: outputStates[OutputChannel.Out3].name,
-      icon: <TextIcon>Out 3</TextIcon>,
-    },
-    {
-      id: 'out4',
-      label: outputStates[OutputChannel.Out4].name,
-      icon: <TextIcon>Out 4</TextIcon>,
-    },
-    {
-      id: 'out5',
-      label: outputStates[OutputChannel.Out5].name,
-      icon: <TextIcon>Out 5</TextIcon>,
-    },
-    {
-      id: 'out6',
-      label: outputStates[OutputChannel.Out6].name,
-      icon: <TextIcon>Out 6</TextIcon>,
-    },
-    {
-      id: 'out7',
-      label: outputStates[OutputChannel.Out7].name,
-      icon: <TextIcon>Out 7</TextIcon>,
-    },
-    {
-      id: 'out8',
-      label: outputStates[OutputChannel.Out8].name,
-      icon: <TextIcon>Out 8</TextIcon>,
-    },
+    { id: 'ina', label: inputStates[InputChannel.InA].name, icon: <TextIcon>In A</TextIcon>, editable: true },
+    { id: 'inb', label: inputStates[InputChannel.InB].name, icon: <TextIcon>In B</TextIcon>, editable: true },
+    { id: 'inc', label: inputStates[InputChannel.InC].name, icon: <TextIcon>In C</TextIcon>, editable: true },
+    { id: 'ind', label: inputStates[InputChannel.InD].name, icon: <TextIcon>In D</TextIcon>, editable: true },
+    { id: 'out1', label: outputStates[OutputChannel.Out1].name, icon: <TextIcon>Out 1</TextIcon>, editable: true },
+    { id: 'out2', label: outputStates[OutputChannel.Out2].name, icon: <TextIcon>Out 2</TextIcon>, editable: true },
+    { id: 'out3', label: outputStates[OutputChannel.Out3].name, icon: <TextIcon>Out 3</TextIcon>, editable: true },
+    { id: 'out4', label: outputStates[OutputChannel.Out4].name, icon: <TextIcon>Out 4</TextIcon>, editable: true },
+    { id: 'out5', label: outputStates[OutputChannel.Out5].name, icon: <TextIcon>Out 5</TextIcon>, editable: true },
+    { id: 'out6', label: outputStates[OutputChannel.Out6].name, icon: <TextIcon>Out 6</TextIcon>, editable: true },
+    { id: 'out7', label: outputStates[OutputChannel.Out7].name, icon: <TextIcon>Out 7</TextIcon>, editable: true },
+    { id: 'out8', label: outputStates[OutputChannel.Out8].name, icon: <TextIcon>Out 8</TextIcon>, editable: true },
     { id: 'miscellaneous', label: 'Miscellaneous', icon: <BoltIcon /> },
   ];
 
@@ -136,6 +88,14 @@ function DSP408Panel({ dsp, api }: { dsp: DSP408; api: DSP408Api }) {
     setPresetLoading(false);
   };
 
+  const onItemRename = async (id: SidebarId, name: string) => {
+    const channel = channelMap[id];
+    if (!channel) return;
+
+    const padded = name.slice(0, 8).padEnd(8, '\0');
+    await api.setChannelName(channel, padded);
+  };
+
   const renderChannel = (channel: { Input: InputChannel } | { Output: OutputChannel }) => (
     <ChannelSection
       dsp={dsp}
@@ -236,6 +196,7 @@ function DSP408Panel({ dsp, api }: { dsp: DSP408; api: DSP408Api }) {
         selectedAppId={presets[selectedPreset]?.id}
         onAppChange={onAppChange}
         onAppRename={api.setCurrentPresetName}
+        onItemRename={onItemRename}
         expanded={sidebarExpanded}
         onToggle={() => setSidebarExpanded((v) => !v)}
       />