Add convoy dashboard panel to gt feed TUI

Adds a third panel to the feed TUI showing:
- In-progress convoys with progress bars (completed/total)
- Recently landed convoys (last 24h) with time since landing

Features:
- Panel cycles with tab: tree -> convoy -> feed
- Direct access via 1/2/3 number keys
- Auto-refresh every 10 seconds
- Styled progress indicators (●●○○)

The convoy panel bridges the gap between "WHO is working" (agent tree)
and "WHAT is happening" (event feed) by showing "WHAT IS SHIPPING".

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

internal/tui/feed/keys.go

@@ -13,10 +13,11 @@ type KeyMap struct {
 	Bottom   key.Binding
 
 	// Panel switching
-	Tab       key.Binding
-	ShiftTab  key.Binding
-	FocusTree key.Binding
-	FocusFeed key.Binding
+	Tab         key.Binding
+	ShiftTab    key.Binding
+	FocusTree   key.Binding
+	FocusConvoy key.Binding
+	FocusFeed   key.Binding
 
 	// Actions
 	Enter   key.Binding
@@ -72,9 +73,13 @@ func DefaultKeyMap() KeyMap {
 			key.WithKeys("1"),
 			key.WithHelp("1", "agent tree"),
 		),
-		FocusFeed: key.NewBinding(
+		FocusConvoy: key.NewBinding(
 			key.WithKeys("2"),
-			key.WithHelp("2", "event feed"),
+			key.WithHelp("2", "convoys"),
+		),
+		FocusFeed: key.NewBinding(
+			key.WithKeys("3"),
+			key.WithHelp("3", "event feed"),
 		),
 		Enter: key.NewBinding(
 			key.WithKeys("enter"),
@@ -120,7 +125,7 @@ func (k KeyMap) ShortHelp() []key.Binding {
 func (k KeyMap) FullHelp() [][]key.Binding {
 	return [][]key.Binding{
 		{k.Up, k.Down, k.PageUp, k.PageDown, k.Top, k.Bottom},
-		{k.Tab, k.FocusTree, k.FocusFeed, k.Enter, k.Expand},
+		{k.Tab, k.FocusTree, k.FocusConvoy, k.FocusFeed, k.Enter, k.Expand},
 		{k.Search, k.Filter, k.ClearFilter, k.Refresh},
 		{k.Help, k.Quit},
 	}