Move the Image pane namespace out of panes.zig into image.zig

Pure move: the body of `pub const Image = struct { ... }` now sits at the
end of image.zig, dedented, under a "the image pane" banner, so the image
thing (decoding, glyph art, and the pane that shows it) is one file. Its
nine `image.X` self-references lose the prefix; image.zig gains the four
imports the pane code uses. panes.zig keeps `pub const Image =
@import("image.zig");`, so `panes.Image.x` callers are unchanged.
image.zig joins the embedded source list, since the pane code left
panes.zig which was on it.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

0 files changed, 0 insertions, 0 deletions