fix(macos): parse semver patch correctly when version has prerelease suffix

Strip prerelease (`-beta.1`) and build (`-4`) suffixes from the patch
component before parsing as integer. Previously `2026.1.11-4` parsed to
`patch: 0` because `Int("11-4")` returns nil; now correctly yields
`patch: 11`.

Fixes #1107

Co-Authored-By: Claude <noreply@anthropic.com>

apps/macos/Sources/Clawdbot/GatewayEnvironment.swift

@@ -25,8 +25,10 @@ struct Semver: Comparable, CustomStringConvertible, Sendable {
               let major = Int(parts[0]),
               let minor = Int(parts[1])
         else { return nil }
-        let patch = Int(parts[2]) ?? 0
-        return Semver(major: major, minor: minor, patch: patch)
+        // Strip prerelease suffix (e.g., "11-4" → "11", "5-beta.1" → "5")
+        let patchRaw = String(parts[2])
+        let patchNumeric = patchRaw.split { $0 == "-" || $0 == "+" }.first.flatMap { Int($0) } ?? 0
+        return Semver(major: major, minor: minor, patch: patchNumeric)
     }
 
     func compatible(with required: Semver) -> Bool {