walkdir: navigator, shortcuts, window wiring, drop target, tests (ht0)

M2 (task ht0): walk the directory.

- src/navigator.{c,h}: GObject (no GtkWidget) holding the folder listing —
  image-MIME filter + extension fallback, hide-RAW-sidecars (decision #33),
  sort name/time/size, cursor + prev/next/wrap, path-based marks (survive
  re-sort, pruned on rescan/monitor, cleared on remove), nearest-fallback,
  GFileMonitor debounced 250ms (decision #28), 'changed' signal. 92% gcov.
- src/shortcuts.{c,h}: GtkShortcutController (MANAGED) binding h/l/Left/Right/
  g/G/o/q to win.* actions; one table all milestones add to.
- src/window.{c,h}: open file->parent+current / folder->first; h/l/g/G actions
  -> nav -> load -> viewer; single GCancellable last-write-wins (g_file_equal
  guard for M3 async); header title 'filename · n/total'; GtkDropTarget
  (GDK_TYPE_FILE_LIST, many->first, decision Z); GtkFileDialog open.
- data/gschema: add hide-raw-sidecars key.
- tests: unit test_navigator (12 subtests), integration test_walk_folder
  (temp fixtures walk + ./sample-images skip-if-absent). 8/8 green; ASan clean
  (GIO_USE_VFS=local in fixtures_env).

Fixed during this milestone: a UAF (borrowed c_name used after unref), a
cancellable double-ref leak, time::modified UINT64 vs INT64, and several
test-harness leaks. Sub-agent review issues addressed (mark pruning on
rescan/monitor, remove-before-cursor test, recursive temp-dir cleanup,
callback _cb naming, connect-before-mutate).

1 files changed, 12 insertions, 6 deletions

diff --git a/tests/test_window.c b/tests/test_window.c
index 0f3fa74..63e54bb 100644
--- a/tests/test_window.c
+++ b/tests/test_window.c
@@ -50,15 +50,21 @@ test_stack_has_two_views(void) {
 
 static void
 test_open_titles_window(void) {
-   GgazeWindow *p_win = new_window();
-
-   GFile *p_file = g_file_new_for_path("/tmp/IMG_0001.jpg");
+   const gchar *c_dir = g_getenv("GGAZE_FIXTURES_DIR");
+   g_assert_nonnull(c_dir);
+   gchar       *c_path = g_build_filename(c_dir, "plain.jpg", NULL);
+   GgazeWindow *p_win  = new_window();
+   GFile       *p_file = g_file_new_for_path(c_path);
    ggaze_window_open(p_win, p_file);
-
-   g_assert_cmpstr(gtk_window_get_title(GTK_WINDOW(p_win)), ==, "IMG_0001.jpg");
-
+   /* M2: opening a file lists its parent folder; the header title carries
+    * the current filename + "n/total". */
+   const gchar *c_title = gtk_window_get_title(GTK_WINDOW(p_win));
+   g_assert_nonnull(c_title);
+   g_assert_nonnull(g_strstr_len(c_title, -1, "plain.jpg"));
+   g_assert_nonnull(g_strstr_len(c_title, -1, "/"));
    g_object_unref(p_file);
    g_object_unref(p_win);
+   g_free(c_path);
 }
 
 int