Navigation: orbit about the point under the cursor, zoom toward it, presets in the display menu

An orbit turns about the model point under the press (the pick ray's
first hit on the plot, the mesh or the design), or the centre of what is
drawn when it starts on empty space, keeps that point still on screen and
marks it while orbiting. The wheel and a pinch zoom toward the point
under the cursor; the wheel's delta is read as it arrives, so a notch
zooms in full in orthographic and perspective views alike (#273).

Mouse presets and reverse zoom come from SolidCraft (prefs.rs NavPreset,
NAV_PRESETS; MIT OR Apache-2.0): FieldCraft's own (left drag per the
navigation bar) stays the default, Ctrl + left drag from empty space
orbits in every preset. They are chosen in the display menu, settable
with ui.set and kept in prefs.json beside recent.json (the browser build
keeps them for the page's run); an older prefs.json still loads.

Fixes #262, fixes #273.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UhhZMBTviDQxZvwnyP89fo
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jyvikoandClaude Opus 5.5 authored and Irakli Kourtis committed 2026-10-14 23:02:34 -04:00
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@@ -173,6 +173,7 @@ is committed and listed here with its exports.
| crates/geometry/src/tagged_mesh.rs (package and part reading, transforms, units, caps) | SolidCraft `crates/io/src/threemf.rs` | MIT OR Apache-2.0 |
| crates/render/src/camera.rs, crates/render/src/raster.rs | SolidCraft `crates/render/src/camera.rs`, `raster.rs` | MIT OR Apache-2.0 |
| crates/ui-egui/src/gpu.rs, crates/ui-egui/src/theme.rs (tokens and their values), crates/ui-egui/src/control.rs, crates/ui-egui/src/lib.rs (input injection, screenshots), crates/ui-egui/src/toolbar.rs (workspace switcher, tabs, panels with drop-downs, fitting), crates/ui-egui/src/appbar.rs (application bar; the mark is drawn from assets/app-icon/icon-small.svg's coordinates), crates/ui-egui/src/titlebar.rs (caption buttons, drag and resize zones; SolidCraft took it from VectorCraft), crates/ui-egui/src/frame.rs (windows, heading bands), crates/ui-egui/src/browser.rs (row drawing), crates/ui-egui/src/palette.rs (command line and search), crates/ui-egui/src/timeline.rs (timeline strip, transport), crates/ui-egui/src/viewport.rs (navigation bar, orientation gizmo), crates/ui-egui/src/files.rs (background opening, file pickers as host services) | SolidCraft `crates/ui-egui/src/` (titlebar.rs also VectorCraft `crates/ui-egui/src/titlebar.rs`) | MIT OR Apache-2.0 |
| crates/ui-egui/src/navigation.rs (navigation presets and bindings), crates/ui-egui/src/viewport.rs (orbit about the point under the cursor, or the drawn centre from empty space; Ctrl + left drag orbits) | SolidCraft `crates/ui-egui/src/prefs.rs` (`NavPreset`, `NavBinding`, `NAV_PRESETS`, `orbit`) | MIT OR Apache-2.0 |
| crates/ui-egui/src/fields.rs (form rows: a label column of fixed width, then the field) | SolidCraft `crates/ui-egui/src/dialogs.rs` | MIT OR Apache-2.0 |
| crates/io/src/fs.rs (atomic writes) | SolidCraft `crates/io/src/safe_write.rs` | MIT OR Apache-2.0 |
| crates/io/src/recovery.rs (recovery folder, entries, locks) | SolidCraft `crates/engine/src/recovery.rs` | MIT OR Apache-2.0 |