diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index de2be43..a257ec1 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -39,6 +39,7 @@ jobs:
         run: bun install --frozen-lockfile
 
       - name: Build (TypeScript check)
+        # Keep explicit typecheck for fast fail before full build/bundle.
         run: bun run tsc --noEmit
 
       - name: Build (bundle)
diff --git a/Makefile b/Makefile
index a462a42..fb446fb 100644
--- a/Makefile
+++ b/Makefile
@@ -54,7 +54,7 @@ help:
 		"  dev-toggle       Toggle overlay in a running local Electron app" \
 		"  dev-stop         Stop a running local Electron app" \
 		"  docs-dev         Run VitePress docs dev server" \
-		"  docs       Build VitePress static docs" \
+		"  docs            Build VitePress static docs" \
 		"  docs-preview     Preview built VitePress docs" \
 		"  install-linux    Install Linux wrapper/theme/app artifacts" \
 		"  install-macos    Install macOS wrapper/theme/app artifacts" \
@@ -134,7 +134,9 @@ build-macos-unsigned: deps
 build-launcher:
 	@printf '%s\n' "[INFO] Bundling launcher script"
 	@bun build ./launcher/main.ts --target=bun --packages=bundle --outfile=subminer
-	@python3 -c 'from pathlib import Path; p=Path("subminer"); c=p.read_text(); c=("#!/usr/bin/env bun\n"+c) if not c.startswith("#!/usr/bin/env bun\n") else c; p.write_text(c)'
+	@if ! head -1 subminer | grep -q '^#!/usr/bin/env bun'; then \
+		{ printf '#!/usr/bin/env bun\n'; cat subminer; } > subminer.tmp && mv subminer.tmp subminer; \
+	fi
 	@chmod +x subminer
 
 clean:
diff --git a/bun.lock b/bun.lock
index eab60d3..e6e5104 100644
--- a/bun.lock
+++ b/bun.lock
@@ -18,6 +18,7 @@
         "electron": "^37.10.3",
         "electron-builder": "^26.7.0",
         "esbuild": "^0.25.0",
+        "prettier": "^3.6.2",
         "typescript": "^5.9.3",
         "vitepress": "^1.6.4",
       },
@@ -970,6 +971,8 @@
 
     "preact": ["preact@10.28.3", "", {}, "sha512-tCmoRkPQLpBeWzpmbhryairGnhW9tKV6c6gr/w+RhoRoKEJwsjzipwp//1oCpGPOchvSLaAPlpcJi9MwMmoPyA=="],
 
+    "prettier": ["prettier@3.8.1", "", { "bin": { "prettier": "bin/prettier.cjs" } }, "sha512-UOnG6LftzbdaHZcKoPFtOcCKztrQ57WkHDeRD9t/PTQtmT0NHSeWWepj6pS0z/N7+08BHFDQVUrfmfMRcZwbMg=="],
+
     "proc-log": ["proc-log@5.0.0", "", {}, "sha512-Azwzvl90HaF0aCz1JrDdXQykFakSSNPaPoiZ9fm5qJIMHioDZEi7OAdRwSm6rSoPtY3Qutnm3L7ogmg3dc+wbQ=="],
 
     "progress": ["progress@2.0.3", "", {}, "sha512-7PiHtLll5LdnKIMw100I+8xJXR5gW2QwWYkT6iJva0bXitZKa/XMrSbdmg3r2Xnaidz9Qumd0VPaMrZlF9V9sA=="],
diff --git a/docs/development.md b/docs/development.md
index eea7cbf..63f82b6 100644
--- a/docs/development.md
+++ b/docs/development.md
@@ -13,7 +13,7 @@ cd SubMiner
 make deps
 # or manually:
 bun install
-bun --cwd vendor/texthooker-ui install
+cd vendor/texthooker-ui && bun install
 ```
 
 ## Building
diff --git a/launcher/config.ts b/launcher/config.ts
index 662c9fc..e9c7e1a 100644
--- a/launcher/config.ts
+++ b/launcher/config.ts
@@ -216,12 +216,18 @@ function ensureTarget(target: string, parsed: Args): void {
     return;
   }
   const resolved = resolvePathMaybe(target);
-  if (fs.existsSync(resolved) && fs.statSync(resolved).isFile()) {
+  let stat: fs.Stats | null = null;
+  try {
+    stat = fs.statSync(resolved);
+  } catch {
+    stat = null;
+  }
+  if (stat?.isFile()) {
     parsed.target = resolved;
     parsed.targetKind = 'file';
     return;
   }
-  if (fs.existsSync(resolved) && fs.statSync(resolved).isDirectory()) {
+  if (stat?.isDirectory()) {
     parsed.directory = resolved;
     return;
   }