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/prometheus_tab.py

@@ -8,6 +8,7 @@ from tkinter import ttk
 import customtkinter as ctk
 from core.prometheus_client import PrometheusClient
 from core.i18n import t
+from core.icons import icon_text
 
 
 class PrometheusTab(ctk.CTkFrame):
@@ -34,7 +35,7 @@ class PrometheusTab(ctk.CTkFrame):
         self._query_entry.pack(side="left", fill="x", expand=True, padx=(0, 10))
         self._query_entry.bind("<Return>", lambda e: self._execute_query())
 
-        self._exec_btn = ctk.CTkButton(query_frame, text=t("prom_execute"), width=90,
+        self._exec_btn = ctk.CTkButton(query_frame, text=icon_text("execute", t("prom_execute")), width=100,
                                        command=self._execute_query)
         self._exec_btn.pack(side="left")
 
@@ -56,7 +57,7 @@ class PrometheusTab(ctk.CTkFrame):
                                      font=ctk.CTkFont(size=14, weight="bold"), anchor="w")
         targets_label.pack(side="left")
 
-        self._refresh_btn = ctk.CTkButton(targets_header, text=t("prom_refresh"), width=90,
+        self._refresh_btn = ctk.CTkButton(targets_header, text=icon_text("refresh", t("prom_refresh")), width=100,
                                           command=self._refresh_all)
         self._refresh_btn.pack(side="right")
 
@@ -198,7 +199,7 @@ class PrometheusTab(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("prom_refresh")))
+                    state="normal", text=icon_text("refresh", t("prom_refresh"))))
 
         threading.Thread(target=_do, daemon=True).start()