fix: player bar CSS + Windows media keys HWND (v1.17.2)

- layout: overflow:hidden on .app-shell + min-height:0 on sidebar/main/queue
  prevents player bar from being pushed off-screen when window is resized
  below OS minHeight constraint (ignored by some Linux WMs)
- lib.rs: pass main window HWND to souvlaki PlatformConfig on Windows so
  SMTC hooks into the existing Win32 message loop instead of creating its
  own — fixes media keys on Windows without crashing

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src-tauri/tauri.conf.json

@@ -1,7 +1,7 @@
 {
   "$schema": "https://schema.tauri.app/config/2",
   "productName": "Psysonic",
-  "version": "1.17.1",
+  "version": "1.17.2",
   "identifier": "dev.psysonic.player",
   "build": {
     "beforeDevCommand": "npm run dev",