fix(gui): readable Environment dropdowns and action buttons — 0.10.1

- Style the QComboBox popup (QAbstractItemView) — it's a separate widget the
  theme didn't cover, so the drop-down list rendered light-on-light.
- Install/Apply finding buttons used PrimaryButton (accent fill + dark text),
  whose fill didn't paint reliably inside the finding cards, leaving dim
  dark-on-dark text. New outlined ActionButton style: bright accent text on the
  dark card, fills accent on hover, with a min-height so the row can't crush it.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/rigdoctor/gui/widgets.py

@@ -66,7 +66,7 @@ def finding_card(finding, on_install=None, on_apply=None) -> QFrame:
         row = QHBoxLayout()
         row.addStretch(1)
         btn = QPushButton(f"Install {component.name}")
-        btn.setObjectName("PrimaryButton")
+        btn.setObjectName("ActionButton")
         btn.setCursor(Qt.CursorShape.PointingHandCursor)
         btn.clicked.connect(lambda: on_install(component))
         row.addWidget(btn)
@@ -83,7 +83,7 @@ def finding_card(finding, on_install=None, on_apply=None) -> QFrame:
             combo.setCurrentText(tunable.current)
         combo.setCursor(Qt.CursorShape.PointingHandCursor)
         apply_btn = QPushButton("Apply")
-        apply_btn.setObjectName("PrimaryButton")
+        apply_btn.setObjectName("ActionButton")
         apply_btn.setCursor(Qt.CursorShape.PointingHandCursor)
         apply_btn.clicked.connect(lambda: on_apply(tunable.id, combo.currentText()))
         row.addWidget(name)