chore(deps): upgrade Wails to v2.15.0 and bump golang.org/x dependencies

Reinstall the Go toolchain and rebuild wails against v2.15.0, then run
'go mod tidy' to update the dependency graph:

- github.com/wailsapp/wails/v2  v2.12.0 -> v2.15.0
- golang.org/x/crypto  v0.52.0 -> v0.53.0
- golang.org/x/net     v0.55.0 -> v0.56.0
- golang.org/x/sys     v0.45.0 -> v0.46.0
- golang.org/x/term    v0.43.0 -> v0.44.0
- golang.org/x/text    v0.37.0 -> v0.39.0

The regenerated Wails runtime bindings (runtime.d.ts / runtime.js) are
included as they surface new APIs shipped in v2.15: the cross-platform
notification API (InitializeNotifications, SendNotification, etc.) and
the EventsOffAll event helper.

go.mod

@@ -5,7 +5,7 @@ go 1.25.0
 require (
 	github.com/99designs/keyring v1.2.2
 	github.com/tidwall/gjson v1.19.0
-	github.com/wailsapp/wails/v2 v2.12.0
+	github.com/wailsapp/wails/v2 v2.15.0
 )
 
 require (
@@ -41,11 +41,11 @@ require (
 	github.com/valyala/fasttemplate v1.2.2 // indirect
 	github.com/wailsapp/go-webview2 v1.0.23 // indirect
 	github.com/wailsapp/mimetype v1.4.1 // indirect
-	golang.org/x/crypto v0.52.0 // indirect
-	golang.org/x/net v0.55.0 // indirect
-	golang.org/x/sys v0.45.0 // indirect
-	golang.org/x/term v0.43.0 // indirect
-	golang.org/x/text v0.37.0 // indirect
+	golang.org/x/crypto v0.53.0 // indirect
+	golang.org/x/net v0.56.0 // indirect
+	golang.org/x/sys v0.46.0 // indirect
+	golang.org/x/term v0.44.0 // indirect
+	golang.org/x/text v0.39.0 // indirect
 )
 
 // replace github.com/wailsapp/wails/v2 v2.9.1 => /home/nymusicman/go/pkg/mod