feat: TUI SFTP Browser Tab - Task 18

- SFTPBrowserTab with remote directory browsing
- Open via Ctrl+F from host list
- Navigate dirs, filter with /, refresh with r
- Dir/icon display with file sizes
- Sort dirs first, then by name

go.mod

@@ -7,6 +7,7 @@ require (
 	github.com/charmbracelet/bubbletea v1.3.10
 	github.com/charmbracelet/lipgloss v1.1.0
 	github.com/google/uuid v1.6.0
+	github.com/pkg/sftp v1.13.7
 	github.com/spf13/cobra v1.10.2
 	github.com/spf13/viper v1.21.0
 	golang.org/x/crypto v0.53.0
@@ -27,6 +28,7 @@ require (
 	github.com/fsnotify/fsnotify v1.9.0 // indirect
 	github.com/go-viper/mapstructure/v2 v2.4.0 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/kr/fs v0.1.0 // indirect
 	github.com/lucasb-eyer/go-colorful v1.3.0 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/mattn/go-localereader v0.0.1 // indirect

go.sum

@@ -23,6 +23,7 @@ github.com/clipperhouse/stringish v0.1.1/go.mod h1:v/WhFtE1q0ovMta2+m+UbpZ+2/HEX
 github.com/clipperhouse/uax29/v2 v2.5.0 h1:x7T0T4eTHDONxFJsL94uKNKPHrclyFI0lm7+w94cO8U=
 github.com/clipperhouse/uax29/v2 v2.5.0/go.mod h1:Wn1g7MK6OoeDT0vL+Q0SQLDz/KpfsVRgg6W7ihQeh4g=
 github.com/cpuguy83/go-md2man/v2 v2.0.6/go.mod h1:oOW0eioCTA6cOiMLiUPZOpcVxMig6NIQQ7OS05n1F4g=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/erikgeiser/coninput v0.0.0-20211004153227-1c3628e74d0f h1:Y/CXytFA4m6baUTXGLOoWe4PQhGxaX0KpnayAqC48p4=
@@ -39,6 +40,8 @@ github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
 github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
+github.com/kr/fs v0.1.0 h1:Jskdu9ieNAYnjxsi0LbQp1ulIKZV1LAFgK1tWhpZgl8=
+github.com/kr/fs v0.1.0/go.mod h1:FFnZGqtBN9Gxj7eW1uZ42v5BccTP0vu6NEaFoC2HwRg=
 github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
 github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
 github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
@@ -59,6 +62,8 @@ github.com/muesli/termenv v0.16.0 h1:S5AlUN9dENB57rsbnkPyfdGuWIlkmzJjbFf0Tf5FWUc
 github.com/muesli/termenv v0.16.0/go.mod h1:ZRfOIKPFDYQoDFF4Olj7/QJbW60Ol/kL1pU3VfY/Cnk=
 github.com/pelletier/go-toml/v2 v2.2.4 h1:mye9XuhQ6gvn5h28+VilKrrPoQVanw5PMw/TB0t5Ec4=
 github.com/pelletier/go-toml/v2 v2.2.4/go.mod h1:2gIqNv+qfxSVS7cM2xJQKtLSTLUE9V8t9Stt+h56mCY=
+github.com/pkg/sftp v1.13.7 h1:uv+I3nNJvlKZIQGSr8JVQLNHFU9YhhNpvC14Y6KgmSM=
+github.com/pkg/sftp v1.13.7/go.mod h1:KMKI0t3T6hfA+lTR/ssZdunHo+uwq7ghoN09/FSu3DY=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/rivo/uniseg v0.4.7 h1:WUdvkW8uEhrYfLC4ZzdpI2ztxP1I582+49Oc5Mq64VQ=
@@ -81,28 +86,71 @@ github.com/spf13/pflag v1.0.10 h1:4EBh2KAYBwaONj6b2Ye1GiHfwjqyROoF4RwYO+vPwFk=
 github.com/spf13/pflag v1.0.10/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
 github.com/spf13/viper v1.21.0 h1:x5S+0EU27Lbphp4UKm1C+1oQO+rKx36vfCoaVebLFSU=
 github.com/spf13/viper v1.21.0/go.mod h1:P0lhsswPGWD/1lZJ9ny3fYnVqxiegrlNrEmgLjbTCAY=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
+github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
 github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
 github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
 github.com/subosito/gotenv v1.6.0 h1:9NlTDc1FTs4qu0DDq7AEtTPNw6SVm7uBMsUCUjABIf8=
 github.com/subosito/gotenv v1.6.0/go.mod h1:Dk4QP5c2W3ibzajGcXpNraDfq2IrhjMIvMSWPKKo0FU=
 github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e h1:JVG44RsyaB9T2KIHavMF/ppJZNG9ZpyihvCd0w101no=
 github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e/go.mod h1:RbqR21r5mrJuqunuUZ/Dhy/avygyECGrLceyNeo4LiM=
+github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
 go.yaml.in/yaml/v3 v3.0.4 h1:tfq32ie2Jv2UxXFdLJdh3jXuOzWiL1fo0bu/FbuKpbc=
 go.yaml.in/yaml/v3 v3.0.4/go.mod h1:DhzuOOF2ATzADvBadXxruRBLzYTpT36CKvDb3+aBEFg=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
+golang.org/x/crypto v0.17.0/go.mod h1:gCAAfMLgwOJRpTjQ2zCCt2OcSfYMTeZVSRtQlPC7Nq4=
 golang.org/x/crypto v0.53.0 h1:QZ4Muo8THX6CizN2vPPd5fBGHyogrdK9fG4wLPFUsto=
 golang.org/x/crypto v0.53.0/go.mod h1:DNLU434OwVakk9PzuwV8w62mAJpRJL3vsgcfp4Qnsio=
 golang.org/x/exp v0.0.0-20231006140011-7918f672742d h1:jtJma62tbqLibJ5sFQz8bKtEM8rJBtfilJ2qTU199MI=
 golang.org/x/exp v0.0.0-20231006140011-7918f672742d/go.mod h1:ldy0pHrwJyGW56pPQzzkH36rKxoZW1tw7ZJpeKx+hdo=
+golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
+golang.org/x/mod v0.8.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
+golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
+golang.org/x/net v0.6.0/go.mod h1:2Tu9+aMcznHK/AK1HMvgo6xiTLG5rD5rZLDS+rp2Bjs=
+golang.org/x/net v0.10.0/go.mod h1:0qNGK6F8kojg2nk9dLZ2mShWaEBan6FAoqfSigmmuDg=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20210809222454-d867a43fc93e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.8.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.15.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/sys v0.46.0 h1:noSf2Fq6F8DBgS+LysIkx7rIExoNHJsxOAtPp4rthXw=
 golang.org/x/sys v0.46.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
+golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
+golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
+golang.org/x/term v0.5.0/go.mod h1:jMB1sMXY+tzblOD4FWmEbocvup2/aLOaQEp7JmGp78k=
+golang.org/x/term v0.8.0/go.mod h1:xPskH00ivmX89bAKVGSKKtLOWNx2+17Eiy94tnKShWo=
+golang.org/x/term v0.15.0/go.mod h1:BDl952bC7+uMoWR75FIrCDx79TPU9oHkTZ9yRbYOrX0=
 golang.org/x/term v0.44.0 h1:0rLvDRCtNj0gZkyIXhCyOb2OAzEhLVqc4B+hrsBhrmc=
 golang.org/x/term v0.44.0/go.mod h1:7ze4MdzUzLXpSAoFP1H0bOI9aXDqveSvatT5vKcFh2Y=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
+golang.org/x/text v0.7.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
+golang.org/x/text v0.9.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
+golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
 golang.org/x/text v0.38.0 h1:sXmwo9DwP3OK9EZ7PqAdaooSGozfl/3a6/xJcbzPRhE=
 golang.org/x/text v0.38.0/go.mod h1:YXZt3QhHUKYT53r2lLKFIVi6Ao1jdzrTR/KQ09qyxF4=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
+golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=
+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

pkg/tui/host_list_tab.go

@@ -75,6 +75,14 @@ func (t *HostListTab) Update(msg tea.Msg) (Tab, tea.Cmd) {
 				}
 			}
 
+		case "ctrl+f":
+			if len(t.hosts) > 0 {
+				host := t.hosts[t.selectedIndex]
+				return t, func() tea.Msg {
+					return openSFTPMsg{host: host}
+				}
+			}
+
 		case "q", "ctrl+c":
 			return t, func() tea.Msg {
 				return quitMsg{}

pkg/tui/messages.go

@@ -45,6 +45,11 @@ type saveHostResultMsg struct {
 	err  error
 }
 
+// openSFTPMsg signals the TUI to open an SFTP browser tab
+type openSFTPMsg struct {
+	host *models.Host
+}
+
 // loadedHostsMsg is produced after reloading hosts from storage
 type loadedHostsMsg struct {
 	hosts []*models.Host

pkg/tui/sftp_browser_tab.go

@@ -0,0 +1,400 @@
+package tui
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"path"
+	"sort"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/charmbracelet/bubbles/textinput"
+	tea "github.com/charmbracelet/bubbletea"
+	"github.com/pkg/sftp"
+
+	"git.tukangketik.id/swanadiva/hostkeeper/internal/models"
+	sshclient "git.tukangketik.id/swanadiva/hostkeeper/pkg/ssh"
+)
+
+type connectionState int
+
+const (
+	stateConnecting connectionState = iota
+	stateConnected
+	stateError
+	stateDone
+)
+
+// SFTPBrowserTab provides a remote file browser via SFTP
+type SFTPBrowserTab struct {
+	host    *models.Host
+	dataDir string
+
+	sshClient *sshclient.Client
+	sftp      *sftp.Client
+	cwd       string
+
+	entries     []os.FileInfo
+	selectedIdx int
+	state       connectionState
+	err         error
+	width       int
+	height      int
+
+	mu      sync.Mutex
+	closeOnce sync.Once
+
+	// search/filter
+	searchMode bool
+	searchInput textinput.Model
+	filterText string
+}
+
+// NewSFTPBrowserTab creates a new SFTP browser tab
+func NewSFTPBrowserTab(host *models.Host, dataDir string) *SFTPBrowserTab {
+	si := textinput.New()
+	si.Placeholder = "Filter files..."
+
+	return &SFTPBrowserTab{
+		host:    host,
+		dataDir: dataDir,
+		cwd:     "/",
+		state:   stateConnecting,
+		searchInput: si,
+	}
+}
+
+func (t *SFTPBrowserTab) Name() string {
+	return "SFTP: " + t.host.Name
+}
+
+func (t *SFTPBrowserTab) Init() tea.Cmd {
+	go t.connect()
+	return t.poll
+}
+
+func (t *SFTPBrowserTab) poll() tea.Msg {
+	t.mu.Lock()
+	state := t.state
+	err := t.err
+	t.mu.Unlock()
+
+	if state == stateError {
+		return sftpDoneMsg{err: err}
+	}
+	if state == stateConnected {
+		return sftpReadyMsg{}
+	}
+	return nil
+}
+
+func (t *SFTPBrowserTab) connect() {
+	timeout := 30 * time.Second
+	cl := sshclient.NewClient(t.host, timeout)
+
+	ctx := context.Background()
+	if err := cl.Connect(ctx); err != nil {
+		t.mu.Lock()
+		t.state = stateError
+		t.err = fmt.Errorf("SSH connect failed: %w", err)
+		t.mu.Unlock()
+		return
+	}
+
+	sftpClient, err := sftp.NewClient(cl.GetClient())
+	if err != nil {
+		cl.Close()
+		t.mu.Lock()
+		t.state = stateError
+		t.err = fmt.Errorf("SFTP init failed: %w", err)
+		t.mu.Unlock()
+		return
+	}
+
+	t.mu.Lock()
+	t.sshClient = cl
+	t.sftp = sftpClient
+	t.mu.Unlock()
+
+	if err := t.refresh(); err != nil {
+		cl.Close()
+		sftpClient.Close()
+		t.mu.Lock()
+		t.state = stateError
+		t.err = err
+		t.mu.Unlock()
+		return
+	}
+
+	t.mu.Lock()
+	t.state = stateConnected
+	t.mu.Unlock()
+}
+
+func (t *SFTPBrowserTab) refresh() error {
+	t.mu.Lock()
+	sftpClient := t.sftp
+	cwd := t.cwd
+	t.mu.Unlock()
+
+	if sftpClient == nil {
+		return fmt.Errorf("not connected")
+	}
+
+	entries, err := sftpClient.ReadDir(cwd)
+	if err != nil {
+		return fmt.Errorf("read dir %s: %w", cwd, err)
+	}
+
+	sort.Slice(entries, func(i, j int) bool {
+		if entries[i].IsDir() != entries[j].IsDir() {
+			return entries[i].IsDir()
+		}
+		return strings.ToLower(entries[i].Name()) < strings.ToLower(entries[j].Name())
+	})
+
+	t.mu.Lock()
+	t.entries = entries
+	if t.selectedIdx >= len(entries) {
+		t.selectedIdx = 0
+	}
+	t.mu.Unlock()
+	return nil
+}
+
+func (t *SFTPBrowserTab) Update(msg tea.Msg) (Tab, tea.Cmd) {
+	switch msg := msg.(type) {
+	case tea.WindowSizeMsg:
+		t.mu.Lock()
+		t.width = msg.Width
+		t.height = msg.Height
+		t.mu.Unlock()
+
+	case sftpReadyMsg:
+		return t, nil
+
+	case sftpDoneMsg:
+		t.mu.Lock()
+		t.state = stateDone
+		if msg.err != nil {
+			t.err = msg.err
+		}
+		t.mu.Unlock()
+		return t, nil
+
+	case sftpRefreshMsg:
+		if err := t.refresh(); err != nil {
+			t.mu.Lock()
+			t.err = err
+			t.mu.Unlock()
+		}
+
+	case tea.KeyMsg:
+		if t.searchMode {
+			switch msg.String() {
+			case "esc", "enter":
+				t.searchMode = false
+				t.filterText = ""
+				return t, nil
+			case "backspace":
+				t.searchInput.Update(msg)
+				t.filterText = t.searchInput.Value()
+				return t, nil
+			default:
+				t.searchInput.Update(msg)
+				t.filterText = t.searchInput.Value()
+				return t, nil
+			}
+		}
+
+		switch msg.String() {
+		case "/":
+			t.searchMode = true
+			t.searchInput.Reset()
+			t.filterText = ""
+			t.searchInput.Focus()
+			return t, nil
+
+		case "esc":
+			return t, func() tea.Msg { return closeFormMsg{} }
+
+		case "up", "k":
+			t.mu.Lock()
+			if t.selectedIdx > 0 {
+				t.selectedIdx--
+			}
+			t.mu.Unlock()
+
+		case "down", "j":
+			t.mu.Lock()
+			if t.selectedIdx < len(t.entries)-1 {
+				t.selectedIdx++
+			}
+			t.mu.Unlock()
+
+		case "enter":
+			t.mu.Lock()
+			entries := t.entries
+			idx := t.selectedIdx
+			t.mu.Unlock()
+
+			if idx < 0 || idx >= len(entries) {
+				return t, nil
+			}
+			entry := entries[idx]
+
+			if entry.IsDir() {
+				t.mu.Lock()
+				t.cwd = path.Join(t.cwd, entry.Name())
+				t.selectedIdx = 0
+				t.mu.Unlock()
+				if err := t.refresh(); err != nil {
+					t.mu.Lock()
+					t.err = err
+					t.mu.Unlock()
+				}
+			}
+
+		case "backspace":
+			t.mu.Lock()
+			parent := path.Dir(t.cwd)
+			if parent == "." {
+				parent = "/"
+			}
+			t.cwd = parent
+			t.selectedIdx = 0
+			t.mu.Unlock()
+			if err := t.refresh(); err != nil {
+				t.mu.Lock()
+				t.err = err
+				t.mu.Unlock()
+			}
+
+		case "r":
+			if err := t.refresh(); err != nil {
+				t.mu.Lock()
+				t.err = err
+				t.mu.Unlock()
+			}
+		}
+	}
+
+	return t, t.poll
+}
+
+func (t *SFTPBrowserTab) View() string {
+	t.mu.Lock()
+	defer t.mu.Unlock()
+
+	switch t.state {
+	case stateConnecting:
+		return HighlightStyle.Render(fmt.Sprintf("Connecting SFTP to %s...", t.host.Name))
+	case stateError:
+		return fmt.Sprintf("%s\n\n%s",
+			ErrorStyle.Render(fmt.Sprintf("SFTP Error: %v", t.err)),
+			SubtitleStyle.Render("Press Esc to close this tab"))
+	case stateDone:
+		return fmt.Sprintf("%s\n\n%s",
+			SubtitleStyle.Render("SFTP session ended"),
+			SubtitleStyle.Render("Press Esc to close this tab"))
+	}
+
+	var b strings.Builder
+
+	b.WriteString(AppTitleStyle.Render(fmt.Sprintf("SFTP: %s@%s", t.host.Username, t.host.Hostname)))
+	b.WriteString("\n")
+	b.WriteString(SubtitleStyle.Render(fmt.Sprintf("  %s", t.cwd)))
+	b.WriteString("\n\n")
+
+	if t.err != nil {
+		b.WriteString(ErrorStyle.Render(fmt.Sprintf("Error: %v", t.err)))
+		b.WriteString("\n\n")
+	}
+
+	if t.sftp == nil {
+		b.WriteString(SubtitleStyle.Render("Not connected."))
+		return b.String()
+	}
+
+	var visible []os.FileInfo
+	if t.searchMode || t.filterText != "" {
+		lower := strings.ToLower(t.filterText)
+		for _, e := range t.entries {
+			if strings.Contains(strings.ToLower(e.Name()), lower) {
+				visible = append(visible, e)
+			}
+		}
+	} else {
+		visible = t.entries
+	}
+
+	if len(visible) == 0 {
+		b.WriteString(SubtitleStyle.Render("  (empty)"))
+	} else {
+		for i, entry := range visible {
+			name := entry.Name()
+			var line string
+
+			if entry.IsDir() {
+				line = fmt.Sprintf("  %s/", name)
+			} else {
+				size := formatSize(entry.Size())
+				line = fmt.Sprintf("  %s  (%s)", name, size)
+			}
+
+			if i == t.selectedIdx {
+				b.WriteString(SelectedStyle.Render(line))
+			} else {
+				style := HostDetailStyle
+				if entry.IsDir() {
+					style = InfoStyle
+				}
+				b.WriteString(style.Render(line))
+			}
+			b.WriteString("\n")
+		}
+	}
+
+	if t.searchMode {
+		b.WriteString("\n" + SubtitleStyle.Render("Filter: ") + t.searchInput.View())
+	} else {
+		b.WriteString("\n" + SubtitleStyle.Render("/:filter  r:refresh  Esc:close"))
+	}
+
+	return b.String()
+}
+
+func (t *SFTPBrowserTab) Close() {
+	t.closeOnce.Do(func() {
+		if t.sftp != nil {
+			t.sftp.Close()
+		}
+		if t.sshClient != nil {
+			t.sshClient.Close()
+		}
+	})
+}
+
+func formatSize(size int64) string {
+	switch {
+	case size >= 1<<30:
+		return fmt.Sprintf("%.1f GiB", float64(size)/float64(1<<30))
+	case size >= 1<<20:
+		return fmt.Sprintf("%.1f MiB", float64(size)/float64(1<<20))
+	case size >= 1<<10:
+		return fmt.Sprintf("%.1f KiB", float64(size)/float64(1<<10))
+	default:
+		return fmt.Sprintf("%d B", size)
+	}
+}
+
+// Message types for SFTP tab
+type sftpReadyMsg struct{}
+
+type sftpDoneMsg struct {
+	err error
+}
+
+type sftpRefreshMsg struct{}

pkg/tui/tui.go

@@ -76,6 +76,11 @@ func (m *Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		cmd := m.tabs.Add(tab)
 		return m, cmd
 
+	case openSFTPMsg:
+		tab := NewSFTPBrowserTab(msg.host, m.dataDir)
+		cmd := m.tabs.Add(tab)
+		return m, cmd
+
 	case closeFormMsg:
 		if m.tabs.Len() > 1 {
 			m.tabs.CloseActive()