fix(windows): resolve the update check and fix the unreadable Update-failed badge

[davidbudnick]

Summary

Fixes two Windows-facing bugs in the Updates page:

1. The update check always fails. The Windows client fetches channels/stable/latest.json and matches os=windows / arch=x86_64 / format=msi, but the published manifest was dmg-only — so the check errored with "no release asset matched the current platform (windows/x86_64)" instead of resolving. The manifest omitted Windows because xtask release latest-json was invoked without --include-windows and the R2 upload excluded the zip/msi.
2. The "Update failed" status pill is unreadable. The OpenLogi Dark theme set danger.foreground to red-600 over a danger.background of #ef4444 (red-500) — dark-red text on a red fill.

This keeps Windows notify-only (the client stays INSTALL_SUPPORTED=false): a resolved check surfaces "Update available" and routes to the GitHub Release for the download rather than auto-installing. The in-app MSI install flow (gpui-updater's staged msiexec) remains switched off — that's separate work.

Changes

release / xtask — .github/workflows/release.yml, xtask/src/commands/release/latest_json.rs:

• Pass --include-windows to xtask release latest-json so the manifest carries the per-arch .msi/.zip entries.
• Stop the R2 upload from excluding *.zip/*.msi and their .minisigs, so the asset + signature URLs the manifest now advertises resolve instead of 404ing (*.exe stays excluded defensively — no bare exe ships).
• Refresh the now-stale --include-windows doc comment.

gui — crates/openlogi-gui/themes/openlogi.json:

• Dark-theme danger.foreground red-600 → neutral-50, matching the light theme's danger treatment.

Testing

Not runtime-tested — these are release-pipeline and theme-data changes:

• The manifest fix only takes effect on the next tagged release; the currently-published latest.json is unaffected. It can be validated before tagging by running the generator against a populated dist/ and confirming the windows/x86_64/msi entry appears: cargo run -p xtask -- release latest-json --dist dist --tag vX.Y.Z --base-url https://updates.openlogi.org --include-windows --output dist/latest.json
• The theme change is a JSON data edit (validated as well-formed); the pill renders near-white on red in dark mode.

[greptile-apps]

Greptile Summary

This PR fixes Windows update checks and improves the failed-update badge. The main changes are:

• Adds Windows MSI and ZIP entries to the release manifest.
• Uploads Windows artifacts and signatures to R2.
• Uses a light foreground for the dark-theme danger badge.
• Updates the Windows manifest option documentation.

Confidence Score: 5/5

This looks safe to merge.

• No blocking issues found in the changed code.

Important Files Changed

Filename	Overview
.github/workflows/release.yml	Enables Windows manifest entries and uploads their MSI, ZIP, and signature files.
crates/openlogi-gui/themes/openlogi.json	Changes the dark-theme danger foreground to a readable light neutral color.
xtask/src/commands/release/latest_json.rs	Updates documentation for the existing Windows manifest option.

_{Reviews (1): Last reviewed commit: "fix(gui): make the dark-theme danger tag..." | Re-trigger Greptile}