feat: allow control over displaying hidden/dotfiles and .gitignore matches (#179)

* feat: add chat setting to toggle hidden files (dotfiles)

* feat: add toggle to show/hide gitignored files in file browser

* refactor: don't reuse visibility setting for dotfiles toggle

* fix: honor hidden/gitignored toggles across runtimes

---------

Co-authored-by: Bohdan Triapitsyn <artmore@protonmail.com>

packages/ui/src/lib/filesViewShowGitignored.ts

@@ -0,0 +1,61 @@
+import React from 'react';
+
+import { getSafeStorage } from '@/stores/utils/safeStorage';
+
+const SHOW_GITIGNORED_STORAGE_KEY = 'filesViewShowGitignored';
+const SHOW_GITIGNORED_EVENT = 'files-view-show-gitignored-change';
+
+const readStoredShowGitignored = (): boolean => {
+  if (typeof window === 'undefined') {
+    return false;
+  }
+  try {
+    const stored = getSafeStorage().getItem(SHOW_GITIGNORED_STORAGE_KEY);
+    return stored === 'true';
+  } catch {
+    return false;
+  }
+};
+
+export const notifyFilesViewShowGitignoredChanged = () => {
+  if (typeof window === 'undefined') {
+    return;
+  }
+  window.dispatchEvent(new Event(SHOW_GITIGNORED_EVENT));
+};
+
+export const setFilesViewShowGitignored = (value: boolean) => {
+  if (typeof window === 'undefined') {
+    return;
+  }
+  try {
+    getSafeStorage().setItem(SHOW_GITIGNORED_STORAGE_KEY, value ? 'true' : 'false');
+    notifyFilesViewShowGitignoredChanged();
+  } catch {
+    // ignore storage errors
+  }
+};
+
+export const useFilesViewShowGitignored = (): boolean => {
+  const [showGitignored, setShowGitignored] = React.useState(readStoredShowGitignored);
+
+  React.useEffect(() => {
+    if (typeof window === 'undefined') {
+      return;
+    }
+    const handleChange = () => {
+      setShowGitignored(readStoredShowGitignored());
+    };
+
+    window.addEventListener('storage', handleChange);
+    window.addEventListener(SHOW_GITIGNORED_EVENT, handleChange);
+    return () => {
+      window.removeEventListener('storage', handleChange);
+      window.removeEventListener(SHOW_GITIGNORED_EVENT, handleChange);
+    };
+  }, []);
+
+  return showGitignored;
+};
+
+export const FILES_VIEW_SHOW_GITIGNORED_STORAGE_KEY = SHOW_GITIGNORED_STORAGE_KEY;