fix: hide token input text and fix plugin installation path

- Change token text field type from General to Password to hide sensitive token values
- Fix plugin installation path for different operating systems
- Resolves #3

📱 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>

Author: matifali

build.gradle.kts

@@ -119,10 +119,10 @@ private fun getPluginInstallDir(): Path {
     } / "JetBrains" / "Toolbox"
 
     val pluginsDir = when {
-        SystemInfoRt.isWindows -> toolboxCachesDir / "cache"
-        SystemInfoRt.isLinux || SystemInfoRt.isMac -> toolboxCachesDir
+        SystemInfoRt.isWindows -> toolboxCachesDir / "cache" / "plugins"
+        SystemInfoRt.isLinux || SystemInfoRt.isMac -> toolboxCachesDir / "plugins"
         else -> error("Unknown os")
-    } / "plugins"
+    }
 
     return pluginsDir / pluginId
 }

src/main/kotlin/com/coder/toolbox/views/TokenPage.kt

@@ -21,7 +21,7 @@ class TokenPage(
     private val token: Pair<String, Source>?,
     private val onToken: ((token: String) -> Unit),
 ) : CoderPage() {
-    private val tokenField = TextField("Token", token?.first ?: "", TextType.General)
+    private val tokenField = TextField("Token", token?.first ?: "", TextType.Password)
 
     override fun getTitle(): String = "Enter your token"