Add Rename to the component right-click menu

Rename is offered from both the canvas and the navigation tree. Names are
checked against Sedona's Component.checkName rules (1-7 ASCII chars, a
letter first, then letters, digits or '_') and must be unique among
siblings. In file mode link paths through the old name are rewritten and
the rename is one undo step; in live mode it goes to the device via Sox
and warns if the device rejects it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

main.py

@@ -1387,6 +1387,71 @@ def open_link_dialog(source_element, target_element):
     ttk.Button(btn_frame, text="Cancel", width=10, command=dialog.destroy).pack(side=tk.LEFT, padx=5)
 
 
+def open_rename_dialog(comp):
+    """Asks for a new name, checking Sedona's naming rules as it is typed."""
+    window = app_state.window
+    root = app_state.xml_root_element
+    if root is None or comp.tag != "comp":
+        return
+    parent = find_parent_element(root, comp)
+    old_name = comp.get("name", "")
+
+    dialog = tk.Toplevel(window)
+    dialog.title("Rename Component")
+    dialog.resizable(False, False)
+    dialog.transient(window)
+    dialog.grab_set()
+    dialog.geometry(f"+{window.winfo_x() + 100}+{window.winfo_y() + 60}")
+
+    main_frame = tk.Frame(dialog, padx=10, pady=10)
+    main_frame.pack(fill=tk.BOTH, expand=True)
+
+    tk.Label(main_frame, text=f"New name for '{old_name}' [id: {comp.get('id', '?')}]:",
+             anchor="w").grid(row=0, column=0, sticky="w")
+    name_var = tk.StringVar(value=old_name)
+    entry = ttk.Entry(main_frame, textvariable=name_var, width=24)
+    entry.grid(row=1, column=0, sticky="we", pady=(4, 0))
+    tk.Label(main_frame, text="1-7 characters: a letter, then letters, digits or '_'.",
+             anchor="w", fg="#666666").grid(row=2, column=0, sticky="w", pady=(4, 0))
+    error_var = tk.StringVar(value="")
+    tk.Label(main_frame, textvariable=error_var, anchor="w", fg="#b00020",
+             wraplength=320, justify="left").grid(row=3, column=0, sticky="w")
+
+    btn_frame = tk.Frame(main_frame)
+    btn_frame.grid(row=4, column=0, pady=(10, 0))
+    ok_button = ttk.Button(btn_frame, text="OK", width=10)
+    ok_button.pack(side=tk.LEFT, padx=5)
+    ttk.Button(btn_frame, text="Cancel", width=10,
+               command=dialog.destroy).pack(side=tk.LEFT, padx=5)
+
+    def current_error():
+        name = name_var.get()
+        if name == old_name:
+            return None
+        return sax_file.check_component_name(name, parent, comp)
+
+    def on_change(*_):
+        err = current_error()
+        error_var.set(err or "")
+        ok_button.state(["disabled"] if err else ["!disabled"])
+
+    def on_ok(*_):
+        if current_error() is not None:
+            return
+        new_name = name_var.get()
+        dialog.destroy()
+        # An open panel may show the old name, so it is refreshed along with the sheet.
+        if new_name != old_name and sax_file.rename_component(comp, new_name):
+            refresh_all_views()
+
+    ok_button.configure(command=on_ok)
+    name_var.trace_add("write", on_change)
+    entry.bind("<Return>", on_ok)
+    dialog.bind("<Escape>", lambda _: dialog.destroy())
+    entry.focus_set()
+    entry.select_range(0, tk.END)
+
+
 def fill_component_popup(menu, comp):
     """Fills a popup with the actions that apply to one component.
 
@@ -1415,6 +1480,12 @@ def fill_component_popup(menu, comp):
             command=lambda: show_user_service(comp),
         )
     menu.add_separator()
+    if comp.tag == "comp":
+        # The app itself is named by its appName property, not by a component name.
+        menu.add_command(
+            label="Rename...",
+            command=lambda: open_rename_dialog(comp),
+        )
     menu.add_command(
         label="Delete Component",
         command=lambda: delete_component(comp),