Move the frame into draw.zig and the transitions out of layout.zig

Pure moves, no behaviour change. draw.zig holds the whole core frame in
order: render, the pane, tag, header and notice painters it calls, and the
character-effect composition (Pardes.render stays a declaration alias).
Presentation.zig is the panel presentation state as a file struct, and
animation.zig the easing curves, transition kinds, tracks and boxes, the
character effects' sources and the generic displayed-value transition, all
of which lived in layout.zig. layout.zig keeps only layout.

2 files changed, 4 insertions, 2 deletions

diff --git a/test/panes.zig b/test/panes.zig
index d0551cfc..11fb750a 100644
--- a/test/panes.zig
+++ b/test/panes.zig
@@ -2,6 +2,7 @@ const std = @import("std");
 const pardes = @import("pardes");
 const panes = pardes.panes;
 const layout = pardes.layout;
+const animation = pardes.animation;
 const Pardes = pardes.Pardes;
 const Pane = pardes.Pane;
 const Key = pardes.Key;
@@ -70,7 +71,7 @@ const TagLayerTests = struct {
             try std.testing.expectEqualStrings("body\n", pane.file.?.content);
             p.update(.{ .key = .{ .cp = Key.escape } });
             const rect = p.rects[0];
-            const track: layout.Track = .{
+            const track: animation.Track = .{
                 .serial = pane.serial,
                 .pane = 0,
                 .effect = .zoom,
diff --git a/test/pdf.zig b/test/pdf.zig
index 3a592451..ed5d6908 100644
--- a/test/pdf.zig
+++ b/test/pdf.zig
@@ -7,6 +7,7 @@ const image = pardes.image;
 const config = pardes.config;
 const builtins = pardes.builtins;
 const layout = pardes.layout;
+const animation = pardes.animation;
 const dump = pardes.dump;
 
 const Pardes = pardes.Pardes;
@@ -1399,7 +1400,7 @@ test "PDF tint and tinted theme changes rebuild every visible raster only" {
     // Chrome animation reads a separate palette. Its ticks must never disturb
     // the target-theme tint key or ask MuPDF for the same pixels again.
     try std.testing.expect(p.animationActive());
-    for (0..layout.Animation.transition_steps) |_| {
+    for (0..animation.Animation.transition_steps) |_| {
         p.update(.tick);
         _ = frame.reset(.retain_capacity);
         const tick_surface = try p.render(frame.allocator());