Show a colour-coded team picker instead of cycling with T

T used to silently cycle Model.activeTeamID through the caller's teams with
no visible list of choices. It now opens a full picker (modelled on the
existing user picker) listing every team plus "All teams", each with a
stable identity colour from a new six-colour theme palette. The same colour
now also shows as a bullet next to "team: <name>" in the header, so the
active team stays visible without opening the picker.

Adds an Identity palette to the theme package (six hues, skipping the ones
that already mean firing/critical), Styles.TeamColor to pick one by team id,
and identity_1..6 as theme-file tokens alongside the existing twelve so a
fully custom theme can still set every token.

internal/tui/model.go

@@ -46,6 +46,7 @@ const (
 	modeSnooze
 	modeConfirm
 	modeUserPicker
+	modeTeamPicker
 	modeUserCreate
 	modeUserNotifyEdit
 	modeAPIKeyMenu
@@ -253,11 +254,12 @@ type Model struct {
 	// Teams. The server scopes everything to the caller's teams; activeTeamID
 	// narrows the incident and alert lists to one of them, 0 meaning all. The
 	// schedule is per team and always needs a concrete one, see scheduleTeam.
-	teams        []api.Team
-	activeTeamID int64
-	defaultTeam  string // config's `team`, resolved on connect
-	meID         int64
-	isAdmin      bool
+	teams           []api.Team
+	activeTeamID    int64
+	defaultTeam     string // config's `team`, resolved on connect
+	meID            int64
+	isAdmin         bool
+	teamPickerTable table.Model
 
 	// Sign-in. Until the server accepts a session the TUI is in modeLogin;
 	// loginNote is a line the form shows above the fields (why we are here), and
@@ -396,6 +398,9 @@ func NewModel(client *api.Client, serverURL string, refreshInterval time.Duratio
 	pickerT := table.New(table.WithFocused(true), table.WithKeyMap(tableKeyMap()))
 	pickerT.SetStyles(ts)
 
+	teamPickerT := table.New(table.WithFocused(true), table.WithKeyMap(tableKeyMap()))
+	teamPickerT.SetStyles(ts)
+
 	manageT := table.New(table.WithFocused(true), table.WithKeyMap(tableKeyMap("d", "k", "p")))
 	manageT.SetStyles(ts)
 
@@ -499,6 +504,7 @@ func NewModel(client *api.Client, serverURL string, refreshInterval time.Duratio
 		scheduleWindow:    window,
 		scheduleTable:     schedT,
 		userPickerTable:   pickerT,
+		teamPickerTable:   teamPickerT,
 		userManageTable:   manageT,
 		userFormInputs:    [2]textinput.Model{usernameIn, emailIn},
 		ntfyTopicInput:    topicIn,
@@ -644,6 +650,20 @@ func (m *Model) rebuildUserPickerTable() {
 	m.userPickerTable.SetHeight(tableHeight(m.height, 10))
 }
 
+// rebuildTeamPickerTable lists "All teams" first, then each of the caller's
+// teams in the same order switchTeam / selectTeam use, so a row's position
+// always matches its place in m.teams.
+func (m *Model) rebuildTeamPickerTable() {
+	m.teamPickerTable.SetColumns(teamPickerColumns(m.width))
+	rows := make([]table.Row, 0, len(m.teams)+1)
+	rows = append(rows, table.Row{m.styles.Muted.Render("●"), "All teams", ""})
+	for _, t := range m.teams {
+		rows = append(rows, table.Row{m.styles.TeamColor(t.ID).Render("●"), t.Name, t.Role})
+	}
+	setRows(&m.teamPickerTable, rows)
+	m.teamPickerTable.SetHeight(tableHeight(m.height, 10))
+}
+
 func (m *Model) rebuildUserManageTable() {
 	m.userManageTable.SetColumns(userManageColumns(m.width))
 	rows := make([]table.Row, len(m.users))
@@ -903,6 +923,20 @@ func userPickerColumns(width int) []table.Column {
 	}
 }
 
+func teamPickerColumns(width int) []table.Column {
+	dotW := 3
+	roleW := 10
+	nameW := width - dotW - roleW - 8
+	if nameW < 15 {
+		nameW = 15
+	}
+	return []table.Column{
+		{Title: "", Width: dotW},
+		{Title: "Team", Width: nameW},
+		{Title: "Role", Width: roleW},
+	}
+}
+
 func userManageColumns(width int) []table.Column {
 	createdW := 12
 	usernameW := 25