starting work on UI

src/ui/widgets/channel.py

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+from textual.containers import VerticalGroup, Horizontal
+from textual.app import ComposeResult
+from textual.widgets import Checkbox, Input, Static
+
+from textual_slider import Slider
+
+
+class Channel(VerticalGroup):
+    DEFAULT_CSS = """
+    Channel {
+        height: 8;
+        border: tall $surface-lighten-1;
+        background: $surface-darken-1;
+        padding: 0 1;
+        margin-bottom: 1;
+        
+        #name {
+            padding: 0 1;
+            margin-bottom: 1;
+        }
+        
+        Checkbox {
+            margin-right: 1;
+        }
+        
+        .channel-slider {
+            height: 1;
+            Static {
+                width: 50%;
+                margin-right: 1;
+            }
+            
+            Slider {
+                width: 45%;
+                border: none;
+                max-height: 1;
+            }
+            
+        }
+        
+        #channel-buttons {
+            margin-top: 1;
+        }
+    }
+    """
+    
+    def __init__(self, channel_name: str = "", muted: bool = False, solo: bool = False, pan: float = 0, volume: float = 0):
+        super().__init__()
+        self.channel_name = channel_name
+        self.muted = muted
+        self.solo = solo
+        self.pan = pan
+        self.volume = volume
+    
+    def compose(self) -> ComposeResult:
+        yield Input(placeholder="Channel Name", compact=True, id="name", value=self.channel_name)
+        
+        with Horizontal(classes="channel-slider"):
+            yield Static("Pan (center):")
+            yield Slider(-100, 100, step=1, value=self.pan)
+        with Horizontal(classes="channel-slider"):
+            yield Static("Volume (+ 0Db):")
+            yield Slider(-15, 15, step=0.1, value=self.volume)
+        
+        with Horizontal(id="channel-buttons"):
+            yield Checkbox("Mute", compact=True, id="mute", tooltip="Mute this track", value=self.muted)
+            yield Checkbox("Solo", compact=True, id="solo", tooltip="Hear only this track", value=self.solo)
+            

src/ui/widgets/sidebar.py

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+from textual.containers import Vertical, VerticalScroll, Horizontal
+from textual.widgets import Button, ListView
+from textual.app import ComposeResult
+
+from ui.widgets.channel import Channel
+
+
+class Sidebar(Vertical):
+    DEFAULT_CSS = """
+    Sidebar {
+        dock: left;
+        background: $surface;
+        width: 40;
+        border-right: tall $surface-lighten-1;
+        padding: 1;
+        
+        #add-channel {
+            min-width: 100%;
+            margin: 1
+        }
+    }
+    """
+    
+    def compose(self) -> ComposeResult:
+        with VerticalScroll(id="channels"):
+            yield Channel()
+            yield Channel()
+            yield Button("+ New Channel", variant="success", id="add-channel")

src/ui/widgets/timeline.py

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+from textual.containers import VerticalScroll, Horizontal
+from textual.app import ComposeResult
+
+
+class TimelineRow(Horizontal):
+    DEFAULT_CSS = """
+    TimelineRow {
+        background: $surface-lighten-1;
+        height: 8;
+        margin-bottom: 1;
+    }
+    """
+    
+    def compose(self) -> ComposeResult:
+        yield from ()
+
+class Timeline(VerticalScroll):
+    DEFAULT_CSS = """
+    Timeline {
+        padding: 1 0;
+        hatch: "-" $surface-lighten-1;
+    }
+    """
+    
+    def compose(self) -> ComposeResult:
+        yield TimelineRow()
+        yield TimelineRow()