Alias navigation preset uses Shift+Alt with LMB/MMB/RMB (Fixes #304) (#306)

Navigation presets are now a table of bindings (button, required modifier
keys, camera mode) instead of string matches. The Alias preset binds
Shift+Alt+left to orbit, Shift+Alt+middle to pan and Shift+Alt+right to
zoom. A left press with a binding's keys is latched until release, so that
drag neither box-selects nor drags sketch geometry; plain left drags behave
as before. Shift only requests snapping when the binding without Shift
still orbits.

The scenario harness sends Alt with ui.drag/ui.click, and camera checks can
assert panned/zoomed since the last camera step. The user guide notes Alt+drag
grabs by KDE and GNOME and how to free them.


Claude-Session: https://claude.ai/code/session_01RjGw4gA5ZvKrU8MQP6sBgT

Co-authored-by: Claude Opus 5.5 <[email protected]>

docs/book/src/guide/ui-tour.md

@@ -14,7 +14,7 @@
   row gives that item's menu. Rows drag into groups and other components.
 - **Viewport.** Click to select, Shift or Ctrl to add, drag for a window or crossing box. The
   wheel zooms at the cursor, the middle button pans and right-drag orbits freely (the mouse
-  preset in Preferences switches to SolidWorks or Inventor style). Shift+middle orbits freely
+  preset in Preferences switches to SolidWorks, Inventor, Alias or Tinkercad style). Shift+middle orbits freely
   in the default and Inventor presets. Shift+right-drag snaps to the nearest standard or
   diagonal view; Shift does not request snapping when the preset already requires it to orbit.
   The axis view shows the world's X/Y/Z directions in SolidCraft's colors. Click a signed
@@ -44,5 +44,17 @@ trackpad event immediately, with no smoothing tail. It is independent of **Anima
 changes**, which controls axis views, Look At, Home and Fit. Re-enabling smoothing during
 a wheel gesture takes effect after that gesture ends, avoiding leftover zoom being replayed.
 
+Navigation › **Alias** uses Alias's camera keys: Shift+Alt+left drag orbits, Shift+Alt+middle
+drag pans and Shift+Alt+right drag zooms (drag down to move away, up to move closer). Without
+Shift+Alt, a left drag still selects with a box and drags sketch geometry.
+
+Some Linux desktops take Alt+drag for themselves (moving or resizing windows), so the viewport
+never sees it. To free it:
+
+- **KDE Plasma:** System Settings › Window Management › Window Behavior › Window Actions, set
+  **Modifier key** to Meta (or None).
+- **GNOME:** run `gsettings set org.gnome.desktop.wm.preferences mouse-button-modifier '<Super>'`
+  (or set Tweaks › Windows › Window Action Key to Super).
+
 Shift-orbit snapping includes 45-degree edge views and isometric corner views, with a
 lightly damped spring transition and a small boundary margin to prevent flicker.