fix(desktop): strip AppImage ARGV0 before child shells (#2588)

AppImage exports ARGV0 into the process environment. zsh treats that as
argv[0] for every external command, which broke Python venv detection in
the integrated terminal and managed OpenCode sessions.

Clear ARGV0 in Electron before login-shell probing, refuse to re-apply it
from shell snapshots, and strip it from terminal PTY and managed OpenCode
launch environments.

Co-authored-by: Serhii Dziupin <makeittech@users.noreply.github.com>

packages/web/server/lib/opencode/env-runtime.js

@@ -232,7 +232,7 @@ export const createOpenCodeEnvRuntime = (deps) => {
       return;
     }
 
-    const skipKeys = new Set(['PWD', 'OLDPWD', 'SHLVL', '_']);
+    const skipKeys = new Set(['PWD', 'OLDPWD', 'SHLVL', '_', 'ARGV0']);
     for (const [key, value] of Object.entries(snapshot)) {
       if (skipKeys.has(key)) {
         continue;
@@ -244,6 +244,9 @@ export const createOpenCodeEnvRuntime = (deps) => {
       process.env[key] = value;
     }
 
+    // AppImage ARGV0 must never remain on process.env (zsh rewrites argv[0]; #2588).
+    delete process.env.ARGV0;
+
     const currentPath = process.env.PATH || '';
     const shellPath = snapshot.PATH || '';
     if (!shellPath) {