style(ui): progress window matches conflict + login

Same skeleton: Prism-green badge ('↻') + uppercase title in the
header row, status text under it, indeterminate progress bar (dark
inset with Prism-green chunk), Cancel button bottom-right styled
as the shared 'secondary' button.

Bumped from 440x160 to 520x240 so the header reads at the same
weight as the other two dialogs. title.upper() applied in run_with
so callers can keep passing 'Cloud sync — pulling' without manual
uppercasing.

Three dialogs now share one visual language: Prism dark surface
(#313131), Prism-green accent (#96db59), monospace for code/data,
circled badge in the top-left of every header.

cloud_sync/ui_qt.py

@@ -85,8 +85,58 @@ def _apply_prism_dark(app: Any) -> None:
     app.setPalette(p)
 
 
+_PROGRESS_QSS = """
+QDialog { background: #313131; }
+QLabel#title {
+    color: white;
+    font-size: 18pt;
+    font-weight: bold;
+    letter-spacing: 2px;
+}
+QLabel#badge {
+    color: #313131;
+    background: #96db59;
+    border-radius: 16px;
+    font-size: 18pt;
+    font-weight: bold;
+    qproperty-alignment: AlignCenter;
+    min-width: 32px;
+    max-width: 32px;
+    min-height: 32px;
+    max-height: 32px;
+}
+QLabel#status {
+    color: #c8c8c8;
+    font-size: 10pt;
+}
+QProgressBar {
+    background: #222222;
+    border: 1px solid #3a3a3a;
+    border-radius: 3px;
+    height: 14px;
+}
+QProgressBar::chunk {
+    background: #96db59;
+    border-radius: 2px;
+}
+QPushButton#secondary {
+    background: #303030;
+    color: white;
+    border: 1px solid #4a4a4a;
+    border-radius: 2px;
+    padding: 8px 20px;
+    font-size: 10pt;
+}
+QPushButton#secondary:hover { background: #3a3a3a; border-color: #96db59; }
+QPushButton#secondary:pressed { background: #222222; }
+QPushButton#secondary:disabled { color: #777; border-color: #2a2a2a; }
+"""
+
+
 class QtProgressWindow:
-    """Modal Qt dialog: title + status + indeterminate progress + Cancel."""
+    """Modal Qt dialog: header badge + uppercase title + status + bar + Cancel.
+
+    Matches the conflict + login dialog skeleton in Prism dark."""
 
     def __init__(self) -> None:
         QtWidgets, QtCore, Signal = import_qt()
@@ -106,35 +156,45 @@ class QtProgressWindow:
 
         self._dialog = QtWidgets.QDialog()
         self._dialog.setWindowTitle("Cloud sync")
-        self._dialog.setFixedSize(440, 160)
-        # Block ESC + window close X → mark cancelled, don't accept
+        self._dialog.setFixedSize(520, 240)
+        self._dialog.setStyleSheet(_PROGRESS_QSS)
         self._dialog.setWindowFlag(
             QtCore.Qt.WindowType.WindowContextHelpButtonHint, False
         )
 
-        layout = QtWidgets.QVBoxLayout(self._dialog)
-        layout.setContentsMargins(20, 20, 20, 20)
+        outer = QtWidgets.QVBoxLayout(self._dialog)
+        outer.setContentsMargins(28, 24, 28, 20)
+        outer.setSpacing(14)
 
-        self._title_label = QtWidgets.QLabel("Working…")
-        font = self._title_label.font()
-        font.setBold(True)
-        font.setPointSize(font.pointSize() + 1)
-        self._title_label.setFont(font)
-        layout.addWidget(self._title_label)
+        header = QtWidgets.QHBoxLayout()
+        header.setSpacing(12)
+        badge = QtWidgets.QLabel("↻")
+        badge.setObjectName("badge")
+        header.addWidget(badge)
+        self._title_label = QtWidgets.QLabel("CLOUD SYNC")
+        self._title_label.setObjectName("title")
+        header.addWidget(self._title_label)
+        header.addStretch(1)
+        outer.addLayout(header)
 
         self._status_label = QtWidgets.QLabel("Starting…")
-        layout.addWidget(self._status_label)
+        self._status_label.setObjectName("status")
+        self._status_label.setWordWrap(True)
+        outer.addWidget(self._status_label)
+
+        outer.addStretch(1)
 
         self._bar = QtWidgets.QProgressBar()
         self._bar.setRange(0, 0)  # indeterminate
         self._bar.setTextVisible(False)
-        layout.addWidget(self._bar)
+        outer.addWidget(self._bar)
 
-        button_row = QtWidgets.QHBoxLayout()
-        button_row.addStretch(1)
+        foot = QtWidgets.QHBoxLayout()
+        foot.addStretch(1)
         self._cancel_btn = QtWidgets.QPushButton("Cancel")
-        button_row.addWidget(self._cancel_btn)
-        layout.addLayout(button_row)
+        self._cancel_btn.setObjectName("secondary")
+        foot.addWidget(self._cancel_btn)
+        outer.addLayout(foot)
 
         self._bridge = _Bridge()
         self._bridge.status_changed.connect(self._status_label.setText)
@@ -155,7 +215,7 @@ class QtProgressWindow:
         return self._cancelled
 
     def run_with(self, worker: Callable[[], int], title: str) -> int:
-        self._title_label.setText(title)
+        self._title_label.setText(title.upper())
         self._status_label.setText("Starting…")
 
         def thread_target() -> None: