phantomchat-v1.0.325 (PR #248)

Automated desktop release from workflow run #58 (run id 39782440606).
Originating PR: #248 — fix(#243): clean-quit-first Linux update restart via detached installer helper

Build run: https://github.com/phantomyard/phantomchat/actions/runs/39782440606
Pull request: #248

Artifacts (Linux unsigned, checksums only):
Linux x64:

• PhantomChat-1.0.325.AppImage
• phantomchat_1.0.325_amd64.deb (deb, in-app update + manual install)
• phantomchat_1.0.325_x86_64.rpm (rpm, in-app update + manual install)
  macOS (Developer ID signed, notarized and stapled):
• PhantomChat-1.0.325-arm64.dmg (Apple Silicon)
• PhantomChat-1.0.325-x64.dmg (Intel)
  The matching .zip files are the in-app updater's payload, not a
  download: install from the DMG.
  Windows (Authenticode signed as "Andrew Hodges"):
• PhantomChat-1.0.325-windows-arm64.exe (ARM64)
• PhantomChat-1.0.325-windows-x64.exe (x64)

Update feed (consumed by the in-app updater, not a download):

• latest.yml (Windows)
• latest-mac.yml (macOS, with PhantomChat-1.0.325-*.zip)
• latest-linux.yml (Linux AppImage + deb + rpm)

Verify with: sha256sum -c SHA256SUMS.txt
Install and channel docs: docs/ELECTRON-DESKTOP.md

Release ring: PREVIEW. This is a prerelease, so it is not served as
the stable/latest release. To ship it to everyone, run the
app-promote workflow against phantomchat-v1.0.325 — that flips this exact release
(same artifacts, same checksums) to stable without rebuilding.