feat(quick): add theme aliases used by the positioner box and scan progress ports

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014KYuz59BEmcx66GwNT3cmL

bec_widgets/utils/quick/README.md

@@ -57,8 +57,11 @@ a theme switch.
 **Aliases for existing ports.** `QmlTheme` also answers to the token names used on the earlier
 branches, so their QML runs unchanged when they switch to this host: `muted`, `faint`, `text`,
 `foreground`, `background`, `accent`, `busy`, `ok`, `warn`, `err`, `emergency`, `isDark`,
-`busyText`, `okText`, `warnText`, `errText`, `busyTint`, `okTint`, `warnTint`, `errTint`.
-New code uses the canonical names.
+`busyText`, `okText`, `warnText`, `errText`, `busyTint`, `okTint`, `warnTint`, `errTint`,
+`window`, `base`, `button`, `onAccent` and `c` (the raw `bec_qthemes` palette as a map, e.g.
+`theme.c.ACCENT_DEFAULT`). New code uses the canonical names. One difference to note: on the
+positioner-box branch `accent` meant the selection colour; here it is `ACCENT_DEFAULT`, so use
+`primary` where that branch used `accent`.
 
 ## Controls
 

bec_widgets/utils/quick/host.py

@@ -61,7 +61,8 @@ class QmlTheme(QObject):
 
     The names used by the first ports are kept as aliases (``muted``, ``faint``, ``text``,
     ``foreground``, ``background``, ``accent``, ``busy``, ``ok``, ``warn``, ``err``,
-    ``emergency``, ``isDark``, ``busyText``, ``okTint`` ...), so their QML runs unchanged.
+    ``emergency``, ``isDark``, ``busyText``, ``okTint``, ``window``, ``base``, ``button``,
+    ``onAccent`` and the raw palette map ``c``), so their QML runs unchanged.
     """
 
     changed = Signal()
@@ -184,6 +185,20 @@ class QmlTheme(QObject):
     okTint = _color_property("success_tint")
     warnTint = _color_property("warning_tint")
     errTint = _color_property("danger_tint")
+    window = _color_property("bg")
+    base = _color_property("field")
+    button = _color_property("card")
+    onAccent = _color_property("on_primary")
+
+    @Property("QVariantMap", notify=changed)
+    def c(self) -> dict:
+        """The raw ``bec_qthemes`` palette as ``{KEY: "#rrggbb"}``, e.g. ``theme.c.ACCENT_DEFAULT``."""
+        theme = app_theme()
+        colors = dict(getattr(theme, "colors", None) or {})
+        return {
+            key: QColor(value).name() for key, value in colors.items() if QColor(value).isValid()
+        }
+
     # pylint: enable=invalid-name
 
     del _color_property, _metric_property

tests/unit_tests/test_ui_kit.py

@@ -105,12 +105,17 @@ def test_qml_theme_aliases_match_canonical_names(dark_theme):
         ("emergency", "danger"),
         ("errText", "dangerText"),
         ("okTint", "successTint"),
+        ("window", "bg"),
+        ("base", "field"),
+        ("button", "card"),
+        ("onAccent", "onPrimary"),
     ]
     for alias, canonical in pairs:
         assert theme.property(alias) == theme.property(canonical), alias
     assert theme.property("isDark") is True
     assert theme.property("radiusLarge") == 10
     assert theme.toneText("warn") == theme.property("warningText")
+    assert QColor(theme.property("c")["CARD_BG"]) == theme.property("card")
 
 
 def test_qml_theme_emits_changed_on_theme_switch(qtbot):