tkinter for Vloot's sidebar, cards and hover rows — status

What Vloot's GUI needed beyond the canvas graphs (feature-nilpy-tkinter-canvas-graphs-dialogs-and-event-widget), found building it natively on 2026-10-20:

tk.Tk(className="vloot"): TkSetClassName sets Tcl's argv0 (first letter lower-cased, as CPython's _tkinter does) before Tk_Init, so winfo_class() is Vloot (WM_CLASS).
uniform= on grid_columnconfigure / grid_rowconfigure / columnconfigure / rowconfigure.
Widget: pack_propagate, grid_propagate, pack_forget, grid_forget, iconphoto(default, image), winfo_class, winfo_ismapped.
Frame: highlightbackground, highlightcolor, borderwidth, relief.
Label: justify, padx, pady, wraplength, width, borderwidth, relief (ttk labels: justify, wraplength, width).
Entry: font, background, foreground, bg, fg.
PhotoImage: width=/height=; data is used only when it is a str/bytes.
w.bind(seq, lambda e: ...) through an untyped w: bug-nilpy-variant-bind-with-a-lambda-picks-the-string-overload.

Vloot's GUI (--threadsafe vloot_gui.py) now builds and draws the same window as CPython under Xvfb (screenshots compared; only the live figures differ).

Test: examples/tk/sidebar_cards_and_hover_rows (python3's output, under Xvfb).