v1.8.52: icons module, Windows SSH sanitization, embedded RDP improvements, UI polish

- Add core/icons.py — centralized icon text helper with emoji/symbol support
- Add Windows SSH command sanitization in ssh.py (Linux→Windows auto-translation)
- Improve embedded RDP: launch tab connect/disconnect, fullscreen toggle
- Refactor sidebar: cleaner server type badges
- Update server_dialog: adaptive fields per server type
- Add setup_openssh.bat tool
- Update skill-ssh.md and CLAUDE.md docs for Windows SSH support
- Cleanup old releases, add v1.8.48-v1.8.52

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

gui/tabs/grafana_tab.py

@@ -9,6 +9,7 @@ from tkinter import ttk
 import customtkinter as ctk
 from core.grafana_client import GrafanaClient
 from core.i18n import t
+from core.icons import icon_text
 
 
 class GrafanaTab(ctk.CTkFrame):
@@ -30,7 +31,7 @@ class GrafanaTab(ctk.CTkFrame):
                              font=ctk.CTkFont(size=18, weight="bold"))
         title.pack(side="left")
 
-        self._refresh_btn = ctk.CTkButton(header_frame, text=t("grafana_refresh"), width=100,
+        self._refresh_btn = ctk.CTkButton(header_frame, text=icon_text("refresh", t("grafana_refresh")), width=110,
                                           command=self._refresh)
         self._refresh_btn.pack(side="right")
 
@@ -129,7 +130,7 @@ class GrafanaTab(ctk.CTkFrame):
                 self.after(0, lambda: self._set_status(f"(error) {e}", "#ef4444"))
             finally:
                 self.after(0, lambda: self._refresh_btn.configure(
-                    state="normal", text=t("grafana_refresh")))
+                    state="normal", text=icon_text("refresh", t("grafana_refresh"))))
 
         threading.Thread(target=_do, daemon=True).start()