fix(opencode): robust Windows CLI discovery and launch across surfaces

Launching: the VS Code extension spawned .cmd shims with shell:true,
which builds an unquoted command line — a path like
"C:\Program Files\nodejs\opencode.cmd" broke with "'C:\Program' is not
recognized". It now spawns cmd.exe directly with the shim path as its
own argv element (the web server's existing cmd-wrapper pattern), and the
web server's final launch-spec fallback routes raw .cmd/.bat through the
same wrapper instead of handing them to spawn.

Configured paths: wrapping quote pairs (Windows "Copy as path" pastes)
are now stripped everywhere a binary path enters — the VS Code setting
and shared settings.json, env vars on both surfaces, the server's
directory-path normalization, and the desktop settings input.

Discovery: added the system-wide npm prefix (Program Files\nodejs) and
scoop's .exe shim to the Windows candidates, Linuxbrew on Linux, and the
where-probe now runs with windowsHide. The macOS desktop-app exclusion
also covers the OpenCode Dev/Beta app bundles.

packages/ui/src/components/sections/openchamber/OpenCodeCliSettings.tsx

@@ -71,7 +71,15 @@ export const OpenCodeCliSettings: React.FC = () => {
   const handleSaveAndReload = React.useCallback(async () => {
     setIsSaving(true);
     try {
-      await updateDesktopSettings({ opencodeBinary: value.trim() });
+      // Strip a wrapping quote pair (Windows "Copy as path" pastes) — literal
+      // quotes are never part of a real path.
+      const trimmed = value.trim();
+      const unquoted = trimmed.length >= 2
+        && ((trimmed.startsWith('"') && trimmed.endsWith('"'))
+          || (trimmed.startsWith("'") && trimmed.endsWith("'")))
+        ? trimmed.slice(1, -1).trim()
+        : trimmed;
+      await updateDesktopSettings({ opencodeBinary: unquoted });
       await reloadOpenCodeConfiguration({
         message: t('settings.openchamber.opencodeCli.actions.restartingOpenCode'),
         mode: 'projects',