Navigate the UI with the controller: L1 shortcuts, modal buttons, Shortcuts tab

[mathiasm74]

What the PR changes

Lets the controller itself drive the UI, so a stick swap or calibration session doesn't need constant trips back to the mouse:

• L1 combos on the Calibration tab: L1+square / L1+circle step through the stick display modes (10x zoom, circularity check; stepping onto circularity again clears the sampled data), L1+triangle runs the calibration dialogs in sequence (center → range → finetune, skipping what the model doesn't support), and L1+cross saves pending changes.
• Buttons work inside the modals too: cross starts/continues center calibration, square switches to quick calibrate, circle cancels (only when the matching on-screen button is available, so a running calibration still can't be interrupted); cross clicks Done in range calibration once it unlocks; circle can stop the sequence between steps; cross closes the Quick Test modal when no test is active. Modals swallow controller input while open so presses don't leak into the page behind them.
• A new Shortcuts tab documents all of it (pinned to the right of the tab bar). It is hidden for VR2 Sense controllers, where the combos are also disabled — a left Sense controller carries L1 together with square and triangle, so they would misfire during normal use.
• The Debug tab is now hidden by default — it opens after 10 clicks on the empty area right of the tabs. It only holds developer info, and hiding it makes room for the new tab on narrow screens.