feat(bec-atlas-admin-view): Add login dilaog

bec_widgets/widgets/services/bec_atlas_admin_view/login_dialog.py

@@ -0,0 +1,70 @@
+"""Login dialog for user authentication."""
+
+from bec_qthemes import apply_theme
+from qtpy.QtCore import Qt, Signal
+from qtpy.QtWidgets import QDialog, QLabel, QLineEdit, QPushButton, QVBoxLayout
+
+
+class LoginDialog(QDialog):
+    credentials_entered = Signal(str, str)
+
+    def __init__(self, parent=None):
+        super().__init__(parent=parent)
+        self.setWindowTitle("Login")
+        self.setModal(True)
+        self.setFixedWidth(320)
+
+        # Slightly increased padding
+        self.setStyleSheet(
+            """
+            QLineEdit {
+                padding: 8px;
+            }
+            """
+        )
+
+        title = QLabel("Sign in", parent=self)
+        title.setAlignment(Qt.AlignmentFlag.AlignCenter)
+        title.setStyleSheet("font-size: 18px; font-weight: 600;")
+
+        self.username = QLineEdit(parent=self)
+        self.username.setPlaceholderText("Username")
+
+        self.password = QLineEdit(parent=self)
+        self.password.setPlaceholderText("Password")
+        self.password.setEchoMode(QLineEdit.Password)
+
+        self.ok_btn = QPushButton("Sign in", parent=self)
+        self.ok_btn.setDefault(True)
+        self.ok_btn.clicked.connect(self._emit_credentials)
+
+        layout = QVBoxLayout(self)
+        layout.setContentsMargins(32, 32, 32, 32)
+        layout.setSpacing(16)
+
+        layout.addWidget(title)
+        layout.addSpacing(8)
+        layout.addWidget(self.username)
+        layout.addWidget(self.password)
+        layout.addSpacing(12)
+        layout.addWidget(self.ok_btn)
+
+        self.username.setFocus()
+
+    def _emit_credentials(self):
+        self.credentials_entered.emit(self.username.text().strip(), self.password.text())
+        self.accept()
+
+
+if __name__ == "__main__":
+    import sys
+
+    from qtpy.QtWidgets import QApplication
+
+    app = QApplication(sys.argv)
+    apply_theme("light")
+
+    dialog = LoginDialog()
+
+    dialog.credentials_entered.connect(lambda u, p: print(f"Username: {u}, Password: {p}"))
+    dialog.exec_()