refactor: separated control stacked widget into pages - #299

What's good

• Removes ~8k lines of generated controlStackedWidget.ui/_ui.py, each page now owns its own UI and logic
• AxisPage, ExtruderPage, FansPage, TemperaturePage talk through signals (request_back, run_gcode_signal), no more reaching into self.panel.*
• _connect_temp_displays suppresses each disconnect() separately; on dev one failing disconnect skipped the bed one
• The true-zero reasoning (QGridLayout remembering the old cell) is written down, which saves the next person the investigation
• CRLF line endings in controlTab.py are preserved, so the diff stays reviewable
• printcorePage/probeHelperPage moved as pure renames (100%/99% similarity), and the mainWindow consumers are updated

1. ControlTab/extruderPage.py:163: extrude_page becomes an empty orphan window, so the paintEvent refresh never runs
self.extrude_page has no parent. widget.setLayout(self.verticalLayout) (L481) takes its layout and all the child widgets, which leaves extrude_page as an empty hidden top-level widget. So paintEvent L153 self.extrude_page.isVisible() is always False and the label never refreshes. Checked with an offscreen repro.

def _setup_ui(self) -> None:
    self.setObjectName("extruder_page")
    self.verticalLayout = QtWidgets.QVBoxLayout(self)  # no widget, no extrude_page
    ...
def paintEvent(self, a0):
    if self.isVisible():
        self.exp_info_label.setText(self.extrude_page_message)
    return super().paintEvent(a0)

2. widget = QWidget(parent=self) + widget.setLayout(...) in all 4 pages moves the page layout into a fixed-size child
axisPage.py:134/514, fansPage.py:120/208, temperaturePage.py:115/294, extruderPage.py:159/481. Qt moves the layout off the page, so the page stops resizing with the stack and there's one extra widget per page. Put the layout on self and delete widget:

self.verticalLayout = QtWidgets.QVBoxLayout(self)
# delete: widget = QtWidgets.QWidget(parent=self) / widget.setGeometry(...) / widget.setLayout(...)

3. ControlTab/temperaturePage.py:42: numpad is wired before printer_config with limits that don't match
On dev the displays stayed unconnected until config arrived. Here L42 uses 370/120 while the on_printer_config fallbacks are 300/100 (L51/L53). Also secondary_text starts as "", so tapping before the first target update (e.g. Klippy not ready) runs round(float("")) at L67/L76: the tap is swallowed and a crash-log entry is written.

_E_LIMITS, _B_LIMITS = (0, 300), (0, 100)
self._connect_temp_displays(*_E_LIMITS, *_B_LIMITS)
...
round(float(self.extruder_temp_display.secondary_text or 0)),

4. controlTab.py:201: typo "Montion"

self.cp_header_title.setText("Motion")

5. controlTab.py: dead members after the split
L31 request_numpad_signal and L48 request_numpad have no users left (the temperature page emits its own signal straight to on_numpad_request). L75 self.timers = [] is never read.

# delete request_numpad_signal, request_numpad, self.timers

6. controlTab.py:402-435: blank is added/removed in two places, and the docstring says the opposite
The docstring says widgets aren't moved between cells, but L422/L432 and _button_change L235/L282 both call addWidget/removeWidget(self.blank) on every call. Rows are already pinned by setRowMinimumHeight (L588-590). Add it once, then only toggle visibility:

# _setup_ui, same cell as cp_button_5 (hidden widgets take no space)
self.cp_content_layout.addWidget(self.blank, 2, 0, 1, 1)
self.blank.hide()

def _show_blank(self, on: bool) -> None:
    self.blank.setVisible(on)
    self.cp_button_5.setVisible(not on)

Also cut the docstring to one line.

7. controlTab.py:530-612: six copy-pasted button blocks, and their icons/texts get overwritten right away
The placeholder icons (routine, input_shaper, info, LEDs at L554-585) and texts (L605-612) are replaced by showEvent -> _button_change(False). Build the buttons in a loop and keep labels/icons in a table in one place:

self.cp_buttons = [self._grid_button(root, r, c) for r in range(3) for c in range(2)]
_MENU = {
    False: [("Motion\nControl", ":/.../motion.svg", lambda: self._button_change(True)), ...],
    True: [...],
}
for btn, (text, icon, slot) in zip(self.cp_buttons, _MENU[active]):
    btn.setText(text); btn.setPixmap(QtGui.QPixmap(icon)); btn.clicked.connect(slot)

8. controlTab.py: pyuic leftovers
L473 self.resize(710, 410) does nothing on a stacked page, L602 setWindowTitle(..., "StackedWidget"), L169 # # @ object temperature change clicked. The _translate("controlStackedWidget", ...) context now points at a deleted .ui (optional: plain strings or self.tr).

# delete L169, L473, L602

9. ControlTab/axisPage.py:265/317: both button groups are named "extrude_select_length_group"
Copy-paste. Also objectName is set twice (L21 "axis_page", L137 "move_axis_page"; same in extruderPage.py:29/162), and self.update() in __init__ (axisPage L24, extruderPage L33) does nothing before the page is shown.

self.axis_select_length_group.setObjectName("axis_select_length_group")
self.axis_select_speed_group.setObjectName("axis_select_speed_group")

10. ControlTab/extruderPage.py:83/126/139: slot decorators don't match the methods
@pyqtSlot(str) is on handle_extrusion(self, extrude: bool). The toggle slots declare (bool, PyQt_PyObject, int) but take (caller, value), caller is never used, and the docstrings mention checked.

@QtCore.pyqtSlot(bool, name="handle-extrusion")
def handle_extrusion(self, extrude: bool) -> None: ...

for btn, v in ((self.extrude_select_length_10_btn, 10), ...):
    btn.toggled.connect(lambda on, v=v: on and self._set_length(v))

11. ControlTab/extruderPage.py:117-123: self.timers grows by one QTimer per extrude press
Timers are appended and never removed, and an earlier timer can set "Ready" in the middle of a later move. Use one restartable timer:

self._ready_timer = QtCore.QTimer(self, singleShot=True)
self._ready_timer.timeout.connect(lambda: self.exp_info_label.setText("Ready"))
...
self._ready_timer.start(int(self.extrude_length / self.extrude_feedrate + 2) * 1000)

12. ControlTab/fansPage.py:82-88: dead branch and a value that gets overwritten
hasattr(card, "continue_clicked") is always true (it's a class signal). If it ever failed, del card only drops the name and the widget stays in fans_content_layout (added at L80). L88 f"{new_value}%" is overwritten by L104-105. The L113 docstring says 0-255, but the slider is 0-100.

card = OptionCard(self, name, name, icon)
card.setObjectName(name)
self.fans_content_layout.addWidget(card)
card.setMode(True)
card.continue_clicked.connect(...)

13. Signal names differ between the new pages
FansPage.request_back_button vs request_back on the other three, and ExtruderPage names its gcode signal "run_gcode" while the rest use "run-gcode". Pick one of each:

request_back = QtCore.pyqtSignal(name="request-back")
run_gcode_signal = QtCore.pyqtSignal(str, name="run-gcode")

14. Orphans to clean up
lib/ui/fansPage.ui and lib/ui/fansPage_ui.py have no importers (already orphaned on dev; this PR deletes the last related module). tests/widgets/test_slider_page_request_unit.py:39/44 still mentions controlStackedWidget_ui.

git rm BlocksScreen/lib/ui/fansPage.ui BlocksScreen/lib/ui/fansPage_ui.py