fix: resolve ruff lint errors in TUI modules

fuzzforge-cli/src/fuzzforge_cli/tui/app.py

@@ -46,13 +46,14 @@ class SingleClickDataTable(DataTable):
     class RowClicked(Message):
         """Fired on every single mouse click on a data row."""
 
-        def __init__(self, data_table: "SingleClickDataTable", cursor_row: int) -> None:
+        def __init__(self, data_table: SingleClickDataTable, cursor_row: int) -> None:
             self.data_table = data_table
             self.cursor_row = cursor_row
             super().__init__()
 
         @property
-        def control(self) -> "SingleClickDataTable":
+        def control(self) -> SingleClickDataTable:
+            """Return the data table that fired this event."""
             return self.data_table
 
     async def _on_click(self, event: events.Click) -> None:  # type: ignore[override]
@@ -471,7 +472,6 @@ class FuzzForgeApp(App[None]):
     @work(thread=True)
     def _run_build(self, server_name: str, image: str, hub_name: str) -> None:
         """Build a Docker/Podman image in a background thread."""
-        import subprocess
         from fuzzforge_cli.tui.helpers import build_image, find_dockerfile_for_server
 
         logs = self._build_logs.setdefault(image, [])
@@ -481,7 +481,7 @@ class FuzzForgeApp(App[None]):
             logs.append(f"ERROR: Dockerfile not found for '{server_name}' in hub '{hub_name}'")
             self._build_results[image] = False
             self._active_builds.pop(image, None)
-            self.call_from_thread(self._on_build_done, image, False)
+            self.call_from_thread(self._on_build_done, image, success=False)
             return
 
         logs.append(f"Building {image} from {dockerfile.parent}")
@@ -493,13 +493,14 @@ class FuzzForgeApp(App[None]):
             logs.append(f"ERROR: {exc}")
             self._build_results[image] = False
             self._active_builds.pop(image, None)
-            self.call_from_thread(self._on_build_done, image, False)
+            self.call_from_thread(self._on_build_done, image, success=False)
             return
 
         self._active_builds[image] = proc  # replace pending marker with actual process
         self.call_from_thread(self._refresh_hub)  # show ⏳ in table
 
-        assert proc.stdout is not None
+        if proc.stdout is None:
+            return
         for line in proc.stdout:
             logs.append(line.rstrip())
 
@@ -507,10 +508,10 @@ class FuzzForgeApp(App[None]):
         self._active_builds.pop(image, None)
         success = proc.returncode == 0
         self._build_results[image] = success
-        self.call_from_thread(self._on_build_done, image, success)
+        self.call_from_thread(self._on_build_done, image, success=success)
 
-    def _on_build_done(self, image: str, success: bool) -> None:
-        """Called on the main thread when a background build finishes."""
+    def _on_build_done(self, image: str, *, success: bool) -> None:
+        """Handle completion of a background build on the main thread."""
         self._refresh_hub()
         if success:
             self.notify(f"✓ {image} built successfully", severity="information")

fuzzforge-cli/src/fuzzforge_cli/tui/helpers.py

@@ -8,6 +8,7 @@ and managing linked MCP hub repositories.
 
 from __future__ import annotations
 
+import contextlib
 import json
 import os
 import subprocess
@@ -301,9 +302,10 @@ def _discover_hub_dirs() -> list[Path]:
     candidates: list[Path] = []
     for base in (get_fuzzforge_user_dir() / "hubs", get_fuzzforge_dir() / "hubs"):
         if base.is_dir():
-            for entry in base.iterdir():
-                if entry.is_dir() and (entry / ".git").is_dir():
-                    candidates.append(entry)
+            candidates.extend(
+                entry for entry in base.iterdir()
+                if entry.is_dir() and (entry / ".git").is_dir()
+            )
     return candidates
 
 
@@ -356,10 +358,8 @@ def load_hubs_registry() -> dict[str, Any]:
 
     registry: dict[str, Any] = {"hubs": hubs}
     # Persist so we don't re-scan on every load
-    try:
+    with contextlib.suppress(OSError):
         save_hubs_registry(registry)
-    except OSError:
-        pass
     return registry
 
 

fuzzforge-cli/src/fuzzforge_cli/tui/screens/build_image.py

@@ -30,6 +30,7 @@ class BuildImageScreen(ModalScreen[bool]):
         self._hub_name = hub_name
 
     def compose(self) -> ComposeResult:
+        """Build the confirmation dialog UI."""
         with Vertical(id="build-dialog"):
             yield Label(f"Build  {self._image}", classes="dialog-title")
             yield Label(
@@ -38,7 +39,7 @@ class BuildImageScreen(ModalScreen[bool]):
             )
             yield Label(
                 "The image will be built in the background.\n"
-                "You\'ll receive a notification when it\'s done.",
+                "You'll receive a notification when it's done.",
                 id="confirm-text",
             )
             with Horizontal(classes="dialog-buttons"):
@@ -46,10 +47,12 @@ class BuildImageScreen(ModalScreen[bool]):
                 yield _NoFocusButton("Cancel", variant="default", id="btn-cancel")
 
     def on_button_pressed(self, event: Button.Pressed) -> None:
+        """Handle Build or Cancel button clicks."""
         if event.button.id == "btn-build":
-            self.dismiss(True)
+            self.dismiss(result=True)
         elif event.button.id == "btn-cancel":
-            self.dismiss(False)
+            self.dismiss(result=False)
 
     def action_cancel(self) -> None:
-        self.dismiss(False)
+        """Dismiss the dialog when Escape is pressed."""
+        self.dismiss(result=False)

fuzzforge-cli/src/fuzzforge_cli/tui/screens/build_log.py

@@ -29,6 +29,7 @@ class BuildLogScreen(ModalScreen[None]):
         self._last_line: int = 0
 
     def compose(self) -> ComposeResult:
+        """Build the log viewer UI."""
         with Vertical(id="build-dialog"):
             yield Label(f"Build log — {self._image}", classes="dialog-title")
             yield Label("", id="build-status")
@@ -37,6 +38,7 @@ class BuildLogScreen(ModalScreen[None]):
                 yield _NoFocusButton("Close", variant="default", id="btn-close")
 
     def on_mount(self) -> None:
+        """Initialize log polling when the screen is mounted."""
         self._flush_log()
         self.set_interval(0.5, self._poll_log)
 
@@ -63,12 +65,14 @@ class BuildLogScreen(ModalScreen[None]):
                     status.update(f"[red]✗ {self._image} build failed[/red]")
 
     def _poll_log(self) -> None:
-        """Called every 500 ms by set_interval."""
+        """Poll for new log lines periodically."""
         self._flush_log()
 
     def on_button_pressed(self, event: Button.Pressed) -> None:
+        """Handle Close button click."""
         if event.button.id == "btn-close":
             self.dismiss(None)
 
     def action_close(self) -> None:
+        """Dismiss the dialog when Escape is pressed."""
         self.dismiss(None)