Fix high-severity issues: implement SSL and warn on raw-SQL filter

SSL was wired through the UI and ConnectionProfile but never actually
applied in any driver or passed from the connection builder.

- main_window: pass ssl/ssl_ca/ssl_cert/ssl_key from profile into
  the driver config dict so drivers can act on them
- MySQL: add ssl={ca,cert,key} to pymysql connect kwargs when enabled
- PostgreSQL: set sslmode=verify-ca (with CA) or require, plus
  sslrootcert/sslcert/sslkey when provided
- MSSQL: switch Encrypt=yes + TrustServerCertificate=no when SSL is
  on; Encrypt=no + TrustServerCertificate=yes otherwise
- SQLite: no change needed (local file, no network layer)

WHERE filter: add tooltip explicitly labelling the input as raw SQL
so users understand arbitrary expressions are executed directly.

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

app/drivers/postgres_driver.py

@@ -26,6 +26,11 @@ class PostgreSQLDriver(BaseDriver):
         db = self.config.get("database", "")
         if db:
             kw["dbname"] = db
+        if self.config.get("ssl"):
+            kw["sslmode"] = "verify-ca" if self.config.get("ssl_ca") else "require"
+            if self.config.get("ssl_ca"):   kw["sslrootcert"] = self.config["ssl_ca"]
+            if self.config.get("ssl_cert"): kw["sslcert"]     = self.config["ssl_cert"]
+            if self.config.get("ssl_key"):  kw["sslkey"]      = self.config["ssl_key"]
         return kw
 
     def connect(self) -> None: