feat: native SSH delegation via tea.ExecProcess + Gruvbox palette

Phase A — Tamagosh-inspired redesign:
- Replace goroutine-based SSH (crypto/ssh) with tea.ExecProcess + native ssh binary
- Zero-lag SSH: native binary pegang TTY langsung, ga ada Go buffering
- Password auth via sshpass -e (SSHPASS env)
- Key auth via ssh -i <tmpfile> + SSH_ASKPASS for passphrase
- ControlMaster sockets for fast reconnect
- Add askpass subcommand for SSH_ASKPASS support
- Gruvbox Material Dark Hard palette for comfortable viewing
- Clean up old session messages (openSessionMsg, sessionOutputMsg, sessionDoneMsg)
- Remove 354-line session.go, replace with 150-line ssh.go

pkg/tui/styles.go

@@ -2,37 +2,40 @@ package tui
 
 import "github.com/charmbracelet/lipgloss"
 
-// Orange theme palette
+// Gruvbox Material Dark Hard palette — warm, soft, easy on eyes
 var (
-	OrangePrimary   = lipgloss.Color("#FF6B00")
-	OrangeSecondary = lipgloss.Color("#FF9F43")
-	OrangeLight     = lipgloss.Color("#FFB800")
-	DarkBg          = lipgloss.Color("#1A1A1A")
-	LightBg         = lipgloss.Color("#2D2D2D")
-	TextPrimary     = lipgloss.Color("#FFFFFF")
-	TextSecondary   = lipgloss.Color("#AAAAAA")
-	GreenSuccess    = lipgloss.Color("#00FF88")
-	RedError        = lipgloss.Color("#FF4444")
-	BlueInfo        = lipgloss.Color("#44AAFF")
+	gbFg     = lipgloss.Color("#d4be98") // primary text
+	gbFgMute = lipgloss.Color("#7c6f64") // secondary/hints
+	gbBgSel  = lipgloss.Color("#45403d") // cursor row bg
+	gbRed    = lipgloss.Color("#ea6962") // error/destructive
+	gbOrange = lipgloss.Color("#e78a4e") // section headers
+	gbYellow = lipgloss.Color("#d8a657") // accent/titles
+	gbGreen  = lipgloss.Color("#a9b665") // active pane/success
+	gbAqua   = lipgloss.Color("#89b482") // interactive keys
+	gbBlue   = lipgloss.Color("#7daea3")
+	gbPurple = lipgloss.Color("#d3869b")
+	gbBorder = lipgloss.Color("#504945") // subtle border
 )
 
 // Component styles
 var (
-	TabActiveStyle   = lipgloss.NewStyle().Background(OrangePrimary).Foreground(DarkBg).Bold(true).Padding(0, 2)
-	TabInactiveStyle = lipgloss.NewStyle().Background(LightBg).Foreground(TextSecondary).Padding(0, 2)
-	TabBarStyle      = lipgloss.NewStyle().Background(DarkBg)
-	StatusBarStyle   = lipgloss.NewStyle().Background(OrangePrimary).Foreground(DarkBg).Padding(0, 1)
-	AppTitleStyle    = lipgloss.NewStyle().Foreground(OrangeSecondary).Bold(true)
-	HighlightStyle   = lipgloss.NewStyle().Foreground(OrangePrimary).Bold(true)
-	SelectedStyle    = lipgloss.NewStyle().Foreground(DarkBg).Background(OrangePrimary).Padding(0, 1)
-	ErrorStyle       = lipgloss.NewStyle().Foreground(RedError).Bold(true)
-	SuccessStyle     = lipgloss.NewStyle().Foreground(GreenSuccess).Bold(true)
-	InfoStyle        = lipgloss.NewStyle().Foreground(BlueInfo)
-	SubtitleStyle    = lipgloss.NewStyle().Foreground(TextSecondary)
-	HostNameStyle    = lipgloss.NewStyle().Foreground(OrangeLight).Bold(true)
-	HostDetailStyle  = lipgloss.NewStyle().Foreground(TextSecondary)
-	TagStyle         = lipgloss.NewStyle().Foreground(GreenSuccess)
+	TabActiveStyle   = lipgloss.NewStyle().Background(gbYellow).Foreground(lipgloss.Color("#1d2021")).Bold(true).Padding(0, 2)
+	TabInactiveStyle = lipgloss.NewStyle().Background(gbBorder).Foreground(gbFgMute).Padding(0, 2)
+	TabBarStyle      = lipgloss.NewStyle().Background(lipgloss.Color("#1d2021"))
+	StatusBarStyle   = lipgloss.NewStyle().Background(gbGreen).Foreground(lipgloss.Color("#1d2021")).Padding(0, 1)
+	AppTitleStyle    = lipgloss.NewStyle().Foreground(gbYellow).Bold(true)
+	HighlightStyle   = lipgloss.NewStyle().Foreground(gbOrange).Bold(true)
+	SelectedStyle    = lipgloss.NewStyle().Foreground(gbFg).Background(gbBgSel).Bold(true).Padding(0, 1)
+	ErrorStyle       = lipgloss.NewStyle().Foreground(gbRed).Bold(true)
+	SuccessStyle     = lipgloss.NewStyle().Foreground(gbGreen).Bold(true)
+	InfoStyle        = lipgloss.NewStyle().Foreground(gbAqua)
+	SubtitleStyle    = lipgloss.NewStyle().Foreground(gbFgMute)
+	HostNameStyle    = lipgloss.NewStyle().Foreground(gbYellow).Bold(true)
+	HostDetailStyle  = lipgloss.NewStyle().Foreground(gbFgMute)
+	TagStyle         = lipgloss.NewStyle().Foreground(gbGreen)
 	TitleStyle       = AppTitleStyle
+	SectionStyle     = lipgloss.NewStyle().Foreground(gbOrange).Bold(true)
+	BorderStyle      = lipgloss.NewStyle().Border(lipgloss.RoundedBorder()).BorderForeground(gbBorder).Padding(1, 2)
 )
 
 // TabWidth returns the width of the tab bar content