The plan panel had its own 2D canvas, which was the wrong place for it: the
layout is drawn on the scenery. The canvas is gone. Points are laid by
clicking the ground under the cursor, the solved geometry is painted over
the rendered world through the colour pass camera, and the panel keeps only
the controls - fits, storage and what is being edited.
The left button belongs to the plan tool while it is up, so a click no
longer also picks or places a scenery node. Clicks landing on a panel stay
with the panel.
With no georeference set the plan frame and the world share an origin, so
easting runs along world x and northing against world z.
Opening the Plan tool now switches the whole colour pass to an orthographic
projection and pins the camera looking straight down, so the plan is drawn
against the loaded scenery rather than in a window of its own. Closing the
tool hands the camera's orientation back; leaving the editor clears the view
outright. The wheel changes how much ground fits on screen instead of moving
the camera, which with no perspective would change nothing but the clipping.
Both configured backends follow: the experimental renderer swaps the pass
projection (and fits its shadow cascades to it), the modern GL renderer uses
its existing ortho helpers. Everything reading the pass projection - the
mouse ray, the frustum test - picks the change up on its own.
The experimental renderer also publishes its colour pass camera now, which
it previously left at the interface defaults, so overlays can place world
points on screen.
A "Plan" panel, opened from Track layout in the editor's menu bar, draws a
niweleta the way the web frontend did: click to lay chained straights, drag
a corner to move it, and pick a fit for each gap between them. The geometry
is entirely maj0sted's - the panel gathers the input, hands the document to
solve_project and paints the rails that come back, coloured by whether they
came from a straight, an arc or a clothoid. Scenery nodes are untouched.
A fit the library cannot produce is simply absent from its answer, so the
gap is labelled as not fitting rather than left looking as though its
parameters took effect. Save/load go through the library's own document
format, so a project written here opens in the same state.
Also translates the comments added with -editor into English, matching the
files they sit in.
