Clean up Config page: remove Export tab, add CreateJailDialog, fix UI details

- Remove Export tab and all its imports from ConfigPage.tsx
- Remove Refresh and Reload fail2ban buttons from JailsTab; clean up
  associated state (reloading, reloadMsg, deactivating) and handlers
- Add Create Config button to Jails tab list pane (listHeader pattern);
  create CreateJailDialog component that calls createJailConfigFile API
- Remove Active/Inactive and 'Has local override' badges from FilterDetail
  and ActionDetail; remove now-unused Badge imports
- Replace read-only log path spans with editable Input fields in JailConfigDetail
- Export CreateJailDialog from components/config/index.ts
- Mark all 5 tasks done in Docs/Tasks.md

frontend/src/components/config/CreateJailDialog.tsx

@@ -0,0 +1,164 @@
+/**
+ * CreateJailDialog — dialog for creating a new jail configuration file.
+ *
+ * Asks for a config file name and calls ``POST /api/config/jail-files`` on
+ * confirmation, seeding the file with a minimal comment header.
+ */
+
+import { useCallback, useEffect, useState } from "react";
+import {
+  Button,
+  Dialog,
+  DialogActions,
+  DialogBody,
+  DialogContent,
+  DialogSurface,
+  DialogTitle,
+  Field,
+  Input,
+  MessageBar,
+  MessageBarBody,
+  Spinner,
+  Text,
+  tokens,
+} from "@fluentui/react-components";
+import { createJailConfigFile } from "../../api/config";
+import type { ConfFileCreateRequest } from "../../types/config";
+import { ApiError } from "../../api/client";
+
+// ---------------------------------------------------------------------------
+// Types
+// ---------------------------------------------------------------------------
+
+export interface CreateJailDialogProps {
+  /** Whether the dialog is currently open. */
+  open: boolean;
+  /** Called when the dialog should close without taking action. */
+  onClose: () => void;
+  /** Called after the jail config file has been successfully created. */
+  onCreated: () => void;
+}
+
+// ---------------------------------------------------------------------------
+// Component
+// ---------------------------------------------------------------------------
+
+/**
+ * Dialog for creating a new jail configuration file at
+ * ``jail.d/{name}.conf``.
+ *
+ * The name field accepts a plain base name (e.g. ``my-custom-jail``); the
+ * backend appends the ``.conf`` extension.
+ *
+ * @param props - Component props.
+ * @returns JSX element.
+ */
+export function CreateJailDialog({
+  open,
+  onClose,
+  onCreated,
+}: CreateJailDialogProps): React.JSX.Element {
+  const [name, setName] = useState("");
+  const [submitting, setSubmitting] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+
+  // Reset form when the dialog opens.
+  useEffect(() => {
+    if (open) {
+      setName("");
+      setError(null);
+    }
+  }, [open]);
+
+  const handleClose = useCallback((): void => {
+    if (submitting) return;
+    onClose();
+  }, [submitting, onClose]);
+
+  const handleConfirm = useCallback((): void => {
+    const trimmedName = name.trim();
+    if (!trimmedName || submitting) return;
+
+    const req: ConfFileCreateRequest = {
+      name: trimmedName,
+      content: `# ${trimmedName}\n`,
+    };
+
+    setSubmitting(true);
+    setError(null);
+
+    createJailConfigFile(req)
+      .then(() => {
+        onCreated();
+      })
+      .catch((err: unknown) => {
+        setError(
+          err instanceof ApiError ? err.message : "Failed to create jail config.",
+        );
+      })
+      .finally(() => {
+        setSubmitting(false);
+      });
+  }, [name, submitting, onCreated]);
+
+  const canConfirm = name.trim() !== "" && !submitting;
+
+  return (
+    <Dialog open={open} onOpenChange={(_e, data) => { if (!data.open) handleClose(); }}>
+      <DialogSurface>
+        <DialogBody>
+          <DialogTitle>Create Config</DialogTitle>
+          <DialogContent>
+            <Text
+              as="p"
+              size={300}
+              style={{ marginBottom: tokens.spacingVerticalM }}
+            >
+              Creates a new jail configuration file at{" "}
+              <code>jail.d/&lt;name&gt;.conf</code>.
+            </Text>
+
+            {error !== null && (
+              <MessageBar
+                intent="error"
+                style={{ marginBottom: tokens.spacingVerticalS }}
+              >
+                <MessageBarBody>{error}</MessageBarBody>
+              </MessageBar>
+            )}
+
+            <Field
+              label="Config name"
+              required
+              hint='Base name without extension, e.g. "my-custom-jail". Must not already exist.'
+            >
+              <Input
+                value={name}
+                onChange={(_e, d) => { setName(d.value); }}
+                placeholder="my-custom-jail"
+                disabled={submitting}
+              />
+            </Field>
+          </DialogContent>
+          <DialogActions>
+            <Button
+              appearance="secondary"
+              onClick={handleClose}
+              disabled={submitting}
+            >
+              Cancel
+            </Button>
+            <Button
+              appearance="primary"
+              onClick={handleConfirm}
+              disabled={!canConfirm}
+              icon={submitting ? <Spinner size="extra-small" /> : undefined}
+            >
+              {submitting ? "Creating…" : "Create Config"}
+            </Button>
+          </DialogActions>
+        </DialogBody>
+      </DialogSurface>
+    </Dialog>
+  );
+}