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>

core/server_store.py

@@ -57,6 +57,7 @@ class ServerStore:
         self._last_backup_time: float = 0
         self._last_backup_hash: str = ""
         self._terminal_font_size: int = 11
+        self._window_geometry: str = ""
         self._servers_file: str = DEFAULT_SERVERS_FILE
         self._load_settings()
         self._load()
@@ -77,6 +78,7 @@ class ServerStore:
                 i18n.set_language(lang)
                 self._check_interval = settings.get("check_interval", 60)
                 self._terminal_font_size = settings.get("terminal_font_size", 11)
+                self._window_geometry = settings.get("window_geometry", "")
             except json.JSONDecodeError:
                 log.warning("Corrupted settings.json, using defaults")
             except Exception as e:
@@ -90,6 +92,7 @@ class ServerStore:
             "language": i18n.get_language(),
             "check_interval": self._check_interval,
             "terminal_font_size": self._terminal_font_size,
+            "window_geometry": self._window_geometry,
         }
         try:
             tmp = SETTINGS_FILE + ".tmp"