Add tabbed settings screen and Send Test Email button

Organize settings into General, Email, SSH, and Web Dashboard tabs
using TabbedContent. Add test-email CLI command and button that
auto-saves settings then sends a test email via SMTP.

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

bin/gniza

@@ -594,6 +594,29 @@ run_cli() {
             exit "$rc"
             ;;
 
+        test-email)
+            if [[ -z "${NOTIFY_EMAIL:-}" ]]; then
+                echo "Error: NOTIFY_EMAIL is not set. Configure it in Settings first."
+                exit 1
+            fi
+            if [[ -z "${SMTP_HOST:-}" ]]; then
+                echo "Error: SMTP_HOST is not set. Configure SMTP settings first."
+                exit 1
+            fi
+            local hostname; hostname=$(hostname -f 2>/dev/null || hostname)
+            local subject="[gniza] [$hostname] Test Email"
+            local body="This is a test email from gniza on $hostname."$'\n'
+            body+="Sent at: $(date '+%Y-%m-%d %H:%M:%S')"$'\n'
+            body+=""$'\n'
+            body+="If you received this message, your SMTP settings are working correctly."
+            if _send_via_smtp "$subject" "$body"; then
+                echo "Test email sent successfully to $NOTIFY_EMAIL"
+            else
+                echo "Failed to send test email. Check your SMTP settings."
+                exit 1
+            fi
+            ;;
+
         version)
             echo "gniza v${GNIZA4LINUX_VERSION}"
             ;;

tui/screens/settings.py

@@ -1,12 +1,14 @@
 from textual.app import ComposeResult
 from textual.screen import Screen
-from textual.widgets import Header, Footer, Static, Button, Input, Select
+from textual.widgets import Header, Footer, Static, Button, Input, Select, TabbedContent, TabPane
 from tui.widgets.header import GnizaHeader as Header  # noqa: F811
 from textual.containers import Vertical, Horizontal
+from textual import work
 
 from tui.config import parse_conf, write_conf, CONFIG_DIR
 from tui.models import AppSettings
-from tui.widgets import DocsPanel
+from tui.backend import run_cli
+from tui.widgets import DocsPanel, OperationLog
 
 
 class SettingsScreen(Screen):
@@ -20,6 +22,8 @@ class SettingsScreen(Screen):
         with Horizontal(classes="screen-with-docs"):
             with Vertical(id="settings-screen"):
                 yield Static("Settings", id="screen-title")
+                with TabbedContent():
+                    with TabPane("General", id="tab-general"):
                         yield Static("Log Level:")
                         yield Select(
                             [("Debug", "debug"), ("Info", "info"), ("Warning", "warn"), ("Error", "error")],
@@ -34,6 +38,9 @@ class SettingsScreen(Screen):
                         yield Input(value=settings.bwlimit, id="set-bwlimit")
                         yield Static("Disk Usage Threshold (%, 0=disable):")
                         yield Input(value=settings.disk_usage_threshold, id="set-diskthreshold")
+                        yield Static("Extra rsync options:")
+                        yield Input(value=settings.rsync_extra_opts, id="set-rsyncopts")
+                    with TabPane("Email", id="tab-email"):
                         yield Static("Notification Email:")
                         yield Input(value=settings.notify_email, id="set-email")
                         yield Static("Notify On:")
@@ -58,13 +65,12 @@ class SettingsScreen(Screen):
                             id="set-smtpsec",
                             value=settings.smtp_security,
                         )
+                    with TabPane("SSH", id="tab-ssh"):
                         yield Static("SSH Timeout:")
                         yield Input(value=settings.ssh_timeout, id="set-sshtimeout")
                         yield Static("SSH Retries:")
                         yield Input(value=settings.ssh_retries, id="set-sshretries")
-                yield Static("Extra rsync options:")
-                yield Input(value=settings.rsync_extra_opts, id="set-rsyncopts")
-                yield Static("Web Dashboard", classes="section-label")
+                    with TabPane("Web Dashboard", id="tab-web"):
                         yield Static("Port:")
                         yield Input(value=settings.web_port, id="set-web-port")
                         yield Static("Host:")
@@ -73,6 +79,7 @@ class SettingsScreen(Screen):
                         yield Input(value=settings.web_api_key, password=True, id="set-web-key")
                 with Horizontal(id="set-buttons"):
                     yield Button("Save", variant="primary", id="btn-save")
+                    yield Button("Send Test Email", id="btn-test-email")
                     yield Button("Back", id="btn-back")
             yield DocsPanel.for_screen("settings-screen")
         yield Footer()
@@ -82,6 +89,9 @@ class SettingsScreen(Screen):
             self.app.pop_screen()
         elif event.button.id == "btn-save":
             self._save()
+        elif event.button.id == "btn-test-email":
+            self._save()
+            self._send_test_email()
 
     def _get_select_val(self, sel_id: str, default: str) -> str:
         sel = self.query_one(sel_id, Select)
@@ -113,5 +123,17 @@ class SettingsScreen(Screen):
         write_conf(conf_path, settings.to_conf())
         self.notify("Settings saved.")
 
+    @work
+    async def _send_test_email(self) -> None:
+        log_screen = OperationLog("Send Test Email", show_spinner=True)
+        self.app.push_screen(log_screen)
+        log_screen.write("Sending test email...")
+        rc, stdout, stderr = await run_cli("test-email")
+        if stdout:
+            log_screen.write(stdout)
+        if stderr:
+            log_screen.write(stderr)
+        log_screen.finish()
+
     def action_go_back(self) -> None:
         self.app.pop_screen()