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>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "psysonic",
-  "version": "1.17.1",
+  "version": "1.17.2",
   "private": true,
   "scripts": {
     "dev": "vite",