feat(installer): add 'Install to disk' in Tools submenu

Copies the live system to a local disk via unsquashfs — no debootstrap,
no network required. Supports UEFI (GPT+EFI) and BIOS (MBR) layouts.

ISO:
- Add squashfs-tools, parted, grub-pc, grub-efi-amd64 to package list
- New overlay script bee-install: partitions, formats, unsquashfs,
  writes fstab, runs grub-install+update-grub in chroot

Go TUI:
- Settings → Tools submenu (Install to disk, Check tools)
- Disk picker screen: lists non-USB, non-boot disks via lsblk
- Confirm screen warns about data loss
- Runs with live progress tail of /tmp/bee-install.log
- platform/install.go: ListInstallDisks, InstallToDisk, findLiveBootDevice

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

audit/internal/tui/update.go

@@ -33,6 +33,12 @@ func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 			}
 			return m, pollSATProgress(m.progressPrefix, m.progressSince)
 		}
+		if m.busy && m.installCancel != nil {
+			if len(msg.lines) > 0 {
+				m.progressLines = msg.lines
+			}
+			return m, pollInstallProgress(DefaultInstallLogFile)
+		}
 		return m, nil
 	case snapshotMsg:
 		m.banner = msg.banner
@@ -112,6 +118,44 @@ func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		m.screen = screenExportTargets
 		m.cursor = 0
 		return m, m.refreshSnapshotCmd()
+	case installDisksMsg:
+		m.busy = false
+		m.busyTitle = ""
+		if msg.err != nil {
+			m.title = "Install to disk"
+			m.body = msg.err.Error()
+			m.prevScreen = screenTools
+			m.screen = screenOutput
+			return m, m.refreshSnapshotCmd()
+		}
+		if len(msg.disks) == 0 {
+			m.title = "Install to disk"
+			m.body = "No suitable disks found.\n\nOnly non-USB, non-boot disks are shown.\nAttach a target disk and try again."
+			m.prevScreen = screenTools
+			m.screen = screenOutput
+			return m, m.refreshSnapshotCmd()
+		}
+		m.installDisks = msg.disks
+		m.screen = screenInstallDiskPick
+		m.cursor = 0
+		return m, m.refreshSnapshotCmd()
+	case installDoneMsg:
+		if m.installCancel != nil {
+			m.installCancel()
+			m.installCancel = nil
+		}
+		m.busy = false
+		m.busyTitle = ""
+		m.progressLines = nil
+		m.prevScreen = screenTools
+		m.screen = screenOutput
+		m.title = "Install to disk"
+		if msg.err != nil {
+			m.body = fmt.Sprintf("Installation FAILED.\n\nLog: %s\n\nERROR: %v", DefaultInstallLogFile, msg.err)
+		} else {
+			m.body = fmt.Sprintf("Installation complete.\n\nRemove the ISO and reboot to start the installed system.\n\nLog: %s", DefaultInstallLogFile)
+		}
+		return m, m.refreshSnapshotCmd()
 	case nvtopClosedMsg:
 		return m, nil
 	case gpuStressDoneMsg:
@@ -204,6 +248,10 @@ func (m model) updateKey(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
 		return m.updateMenu(msg, len(m.targets), m.handleExportTargetsMenu)
 	case screenInterfacePick:
 		return m.updateMenu(msg, len(m.interfaces), m.handleInterfacePickMenu)
+	case screenTools:
+		return m.updateMenu(msg, len(m.toolsMenu), m.handleToolsMenu)
+	case screenInstallDiskPick:
+		return m.updateMenu(msg, len(m.installDisks), m.handleInstallDiskPickMenu)
 	case screenOutput:
 		switch msg.String() {
 		case "esc", "enter", "q":
@@ -300,6 +348,12 @@ func (m model) updateMenu(msg tea.KeyMsg, size int, onEnter func() (tea.Model, t
 		case screenInterfacePick:
 			m.screen = screenNetwork
 			m.cursor = 0
+		case screenTools:
+			m.screen = screenSettings
+			m.cursor = 0
+		case screenInstallDiskPick:
+			m.screen = screenTools
+			m.cursor = 0
 		}
 	case "q", "ctrl+c":
 		return m, tea.Quit