fix(non-interactive-env): use detectShellType instead of hardcoded win32 check (#3310, #3338)

Hardcoded platform check forced PowerShell env syntax on Windows
regardless of the actual shell. Replaced with detectShellType() so
Git Bash, WSL, and similar environments use unix prefixes while
native PowerShell continues to get powershell prefixes.

🤖 Generated with OhMyOpenCode assistance
https://github.com/code-yeongyu/oh-my-opencode

src/hooks/non-interactive-env/non-interactive-env-hook.ts

@@ -1,6 +1,7 @@
 import type { PluginInput } from "@opencode-ai/plugin"
 import { HOOK_NAME, NON_INTERACTIVE_ENV, SHELL_COMMAND_PATTERNS } from "./constants"
 import { log, buildEnvPrefix } from "../../shared"
+import { detectShellType } from "../../shared/shell-env"
 
 export * from "./constants"
 export * from "./detector"
@@ -52,7 +53,7 @@ export function createNonInteractiveEnvHook(_ctx: PluginInput) {
       // The env vars (GIT_EDITOR=:, EDITOR=:, etc.) must ALWAYS be injected
       // for git commands to prevent interactive prompts.
 
-      const shellType = process.platform === "win32" ? "powershell" : "unix"
+      const shellType = detectShellType()
       const envPrefix = buildEnvPrefix(NON_INTERACTIVE_ENV, shellType)
       
       // Check if the command already starts with the prefix to avoid stacking.