feat: tui: Make "max pixels" optional for the grid

- Add: `--no-max-pixels-grid` command-line option.
_ Add: `.main.NO_MAX_PIXELS_GRID`.
- Change: Do not apply "max pixels" to grid rendering when thumbnailing
  is disabled and `--no-max-pixels-grid` is specified.

src/termvisage/parsers.py

@@ -620,6 +620,14 @@ def strip_markup(string: str) -> str:
     action="store_true",
     help="Apply :option:`--max-pixels` in CLI mode",
 )
+perf_options.add_argument(
+    "--no-max-pixels-grid",
+    action="store_true",
+    help=(
+        "Do not apply :option:`--max-pixels` to the image grid in TUI mode when "
+        "thumbnailing is disabled."
+    ),
+)
 perf_options.add_argument(
     "--multi",
     action=BooleanOptionalAction,

src/termvisage/tui/__init__.py

@@ -42,6 +42,7 @@ def init(
     main.DEBUG = args.debug
     main.MAX_PIXELS = args.max_pixels
     main.NO_ANIMATION = args.no_anim
+    main.NO_MAX_PIXELS_GRID = args.no_max_pixels_grid
     main.RECURSIVE = args.recursive
     main.SHOW_HIDDEN = args.all
     main.THUMBNAIL = args.thumbnail

src/termvisage/tui/main.py

@@ -712,6 +712,7 @@ def update_screen():
 DEBUG: bool
 MAX_PIXELS: int
 NO_ANIMATION: bool
+NO_MAX_PIXELS_GRID: bool
 RECURSIVE: bool
 SHOW_HIDDEN: bool
 THUMBNAIL: bool

src/termvisage/tui/widgets.py

@@ -284,8 +284,12 @@ def render(self, size: Tuple[int, int], focus: bool = False) -> urwid.Canvas:
                 # is the image grid in view? (next two lines)
                 view.original_widget is image_grid_box
                 and context != "full-grid-image"
-                # is thumbnailing enabled?
-                and tui_main.THUMBNAIL
+                and (
+                    # is thumbnailing enabled?
+                    tui_main.THUMBNAIL
+                    # does "max pixels" NOT apply to the image grid?
+                    or tui_main.NO_MAX_PIXELS_GRID
+                )
             )
             # does the image have more pixels than `max pixels`?
             and mul(*image.original_size) > tui_main.MAX_PIXELS