[ci] Generate Wails bindings in release, bump wails to alpha.91

The bindings under client/ui/frontend/bindings are gitignored (1ebb507),
so the release UI job has to regenerate them before pnpm build — the
@wailsio/runtime Vite plugin refuses to build without them. Add a
wails3 CLI install step (version derived from go.mod via go list -m,
so it stays in sync with the runtime the binary links against), plus a
goreleaser before-hook that runs `wails3 generate bindings -clean=true
-ts` ahead of the existing pnpm install + pnpm build pair.

Bump github.com/wailsapp/wails/v3 to v3.0.0-alpha.91 in the process.
The @wailsio/runtime npm package stays at "latest" since the registry
only goes up to alpha.79 — the binding generator and the runtime stay
compatible across that gap until the binding shape changes.

go.sum

@@ -703,8 +703,8 @@ github.com/vmihailenco/msgpack/v5 v5.4.1 h1:cQriyiUvjTwOHg8QZaPihLWeRAAVoCpE00IU
 github.com/vmihailenco/msgpack/v5 v5.4.1/go.mod h1:GaZTsDaehaPpQVyxrf5mtQlH+pc21PIudVV/E3rRQok=
 github.com/vmihailenco/tagparser/v2 v2.0.0 h1:y09buUbR+b5aycVFQs/g70pqKVZNBmxwAhO7/IwNM9g=
 github.com/vmihailenco/tagparser/v2 v2.0.0/go.mod h1:Wri+At7QHww0WTrCBeu4J6bNtoV6mEfg5OIWRZA9qds=
-github.com/wailsapp/wails/v3 v3.0.0-alpha.89 h1:b2LK1cbcyTv78nVaC+OvNkqvLvLwGbEc7AGDfkEJhjo=
-github.com/wailsapp/wails/v3 v3.0.0-alpha.89/go.mod h1:5exzAEkyvbCcdowFevzZf23SYEEvmf+pkx7gg1gOR0Q=
+github.com/wailsapp/wails/v3 v3.0.0-alpha.91 h1:hNbysesX5Q+d9+CkDjgTmt1rHDFp5vCDT6UqrE0fFfg=
+github.com/wailsapp/wails/v3 v3.0.0-alpha.91/go.mod h1:5exzAEkyvbCcdowFevzZf23SYEEvmf+pkx7gg1gOR0Q=
 github.com/wailsapp/wails/webview2 v1.0.24 h1:uULnjCSaRfMlU84mS3kjLgPsRosEOIusVK1nFOHZHzs=
 github.com/wailsapp/wails/webview2 v1.0.24/go.mod h1:sdf+s0nAdxlzVWf9SCxC15XaxnQPJeY+uU1Ucn3jHQM=
 github.com/wlynxg/anet v0.0.5 h1:J3VJGi1gvo0JwZ/P1/Yc/8p63SoW98B5dHkYDmpgvvU=