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/info_tab.py

@@ -4,6 +4,7 @@ Info tab — display server details, edit button.
 
 import customtkinter as ctk
 from core.i18n import t
+from core.icons import icon_text
 
 
 class InfoTab(ctk.CTkFrame):
@@ -55,7 +56,7 @@ class InfoTab(ctk.CTkFrame):
             self._fields[key] = val
 
         # Edit button
-        self.edit_btn = ctk.CTkButton(self, text=t("edit_server_btn"), command=self._on_edit)
+        self.edit_btn = ctk.CTkButton(self, text=icon_text("edit", t("edit_server_btn")), command=self._on_edit)
         self.edit_btn.pack(pady=15)
 
     def set_server(self, alias: str | None):