Prism 1.1.0

The changeset sidebar is resizable: drag its right edge, double-click
it to return to the default width.
The divider between the A and B panes can be dragged in the Blocks and
Fluid layouts (the whole Fluid gutter is the grip); the path bar
follows it, each pane keeps a minimum width, and a double-click splits
the panes evenly again.
New windows open with the sidebar width and pane split last dragged.
Folder groups in the changeset sidebar collapse and expand with a
click, shown by a chevron and a folder icon. The file being compared
stays open while its folder is collapsed, and Next File / Previous File
open collapsed folders as they reach them.

Folder comparison with "compare contents": files whose dates differ
could stay marked as pending while the Mac was busy with other work
(another folder scan, for example), because their checks got no
processor time until the load stopped. They now run alongside it.
Folder comparison with "compare contents": each checked file no
longer re-sorts its whole folder. With thousands of touched files (a
fresh checkout, for example) the checks used to take minutes of CPU;
they now finish in about the time it takes to read the files.

The 50 ms cancellation bound for a 300k-line diff (unit test) is now
checked on a developer Mac only, like the other timing-sensitive tests:
the shared 3-CPU CI runners miss it under load (118 ms).
The deep pass of the 200k-file folder tree gets a 16 s budget on CI
(scale 8), up from 6 s: the current macos-26 runner image takes 8.6 to
13.3 s for it with this release and with 1.0.0 alike. On a developer
Mac it stays under 1 s, within the 2 s budget.
On CI, the M1 acceptance run checks that every diff stops when
cancelled, but no longer the 50 ms bound; that bound is checked on a
developer Mac.
Resizing and collapsing were checked by hand on a developer build;
VoiceOver on the new folder rows and on the resize handles was not.
The release candidate itself: Prism.app from the zip is verified
(signature, versions) but not launched.

Prism-1.1.0-macos-arm64.zip: Prism.app (Apple silicon, macOS 14 or later). Ad-hoc signed
with the hardened runtime and not notarized.
SHA256SUMS: check the downloads with shasum -a 256 -c SHA256SUMS.

Unzip Prism-1.1.0-macos-arm64.zip and move Prism.app to /Applications.
The app is not notarized, so macOS quarantines the download. Clear the
flag once: xattr -dr com.apple.quarantine /Applications/Prism.app.
To use prism from a terminal (git difftool and mergetool, editors,
scripts), choose Prism > Integration… and install the command-line
tool, or link it yourself:
ln -s /Applications/Prism.app/Contents/Helpers/prism ~/bin/prism.

Updates: download new versions from the GitHub Releases page.

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