server groups: grouped sidebar, GroupDialog, context menus, i18n + cleanup old releases

- Groups CRUD in sidebar (create, rename, change color, reorder, delete)
- Collapsible group headers with color dots and server count
- "Move to Group" context menu on servers
- Group dropdown in ServerDialog (add/edit)
- 17 i18n keys (EN/RU/ZH)
- Search auto-expands groups
- Cleaned up old release binaries

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

gui/group_dialog.py

@@ -0,0 +1,110 @@
+"""
+Dialog for creating / editing server groups.
+"""
+
+import customtkinter as ctk
+from typing import Optional
+
+from core.i18n import t
+
+GROUP_COLORS = [
+    "#ef4444",  # red
+    "#f97316",  # orange
+    "#f59e0b",  # amber
+    "#22c55e",  # green
+    "#3b82f6",  # blue
+    "#6366f1",  # indigo
+    "#a855f7",  # purple
+    "#ec4899",  # pink
+]
+
+
+class GroupDialog(ctk.CTkToplevel):
+    """Small dialog: group name + color picker (8 circles)."""
+
+    def __init__(self, master, store, group: Optional[dict] = None):
+        super().__init__(master)
+        self.store = store
+        self._group = group  # None = add, dict = edit
+        self.result: Optional[dict] = None
+
+        self.title(t("edit_group") if group else t("add_group"))
+        self.geometry("340x200")
+        self.resizable(False, False)
+        self.transient(master)
+        self.grab_set()
+
+        # ── Name ──
+        ctk.CTkLabel(self, text=t("group_name"), anchor="w").pack(
+            fill="x", padx=20, pady=(15, 2))
+        self._name_var = ctk.StringVar(value=group["name"] if group else "")
+        self._name_entry = ctk.CTkEntry(self, textvariable=self._name_var)
+        self._name_entry.pack(fill="x", padx=20)
+        self._name_entry.focus()
+
+        # ── Color picker ──
+        ctk.CTkLabel(self, text=t("group_color"), anchor="w").pack(
+            fill="x", padx=20, pady=(10, 2))
+
+        color_frame = ctk.CTkFrame(self, fg_color="transparent")
+        color_frame.pack(fill="x", padx=20)
+
+        self._selected_color = group["color"] if group else GROUP_COLORS[0]
+        self._color_buttons: list[ctk.CTkButton] = []
+
+        for color in GROUP_COLORS:
+            btn = ctk.CTkButton(
+                color_frame, text="", width=28, height=28,
+                fg_color=color, hover_color=color,
+                border_width=3,
+                border_color=color,
+                corner_radius=14,
+                command=lambda c=color: self._pick_color(c),
+            )
+            btn.pack(side="left", padx=2)
+            self._color_buttons.append(btn)
+
+        self._highlight_selected_color()
+
+        # ── Buttons ──
+        btn_frame = ctk.CTkFrame(self, fg_color="transparent")
+        btn_frame.pack(fill="x", padx=20, pady=(15, 10))
+
+        ctk.CTkButton(btn_frame, text=t("cancel"), width=80,
+                       fg_color="gray", command=self.destroy).pack(side="left")
+        ctk.CTkButton(btn_frame, text=t("save"), width=80,
+                       command=self._save).pack(side="right")
+
+        # Enter to save
+        self.bind("<Return>", lambda e: self._save())
+
+    def _pick_color(self, color: str):
+        self._selected_color = color
+        self._highlight_selected_color()
+
+    def _highlight_selected_color(self):
+        for btn in self._color_buttons:
+            fg = btn.cget("fg_color")
+            if fg == self._selected_color:
+                btn.configure(border_color="white")
+            else:
+                btn.configure(border_color=fg)
+
+    def _save(self):
+        name = self._name_var.get().strip()
+        if not name:
+            self._name_entry.focus()
+            return
+
+        if self._group:
+            # Edit mode
+            self.store.update_group(
+                self._group["id"], name=name, color=self._selected_color)
+            self.result = {"id": self._group["id"], "name": name,
+                           "color": self._selected_color}
+        else:
+            # Add mode
+            group = self.store.add_group(name, self._selected_color)
+            self.result = group
+
+        self.destroy()