Complete uniffi 0.29 upgrade and async callback infrastructure

This commit completes the uniffi upgrade from 0.28.0 to 0.29.1 and establishes the infrastructure for async callbacks in WASM32 environments.

Key changes:
- Upgrade uniffi to 0.29.1 with git source for async callback support
- Fix FFI macros to use smart async runtime selection for WASM32 vs native
- Update tokio features across matrix-sdk crates for WASM32 compatibility
- Add TypeScript bindings configuration to uniffi.toml
- Fix xtask build system for uniffi 0.29 API changes

Author: Daniel Salinas

Cargo.lock

@@ -92,8 +92,9 @@ tracing = { version = "0.1.40", default-features = false, features = ["std"] }
 tracing-core = "0.1.32"
 tracing-subscriber = "0.3.18"
 unicode-normalization = "0.1.24"
-uniffi = { version = "0.28.0" }
-uniffi_bindgen = { version = "0.28.0" }
+uniffi = { git = "https://github.com/mozilla/uniffi-rs", rev = "c7f6caa3d1bf20f934346cefd8e82b5093f0dc6f" }
+uniffi_bindgen = { git = "https://github.com/mozilla/uniffi-rs", rev = "c7f6caa3d1bf20f934346cefd8e82b5093f0dc6f" }
+uniffi_core = { git = "https://github.com/mozilla/uniffi-rs", rev = "c7f6caa3d1bf20f934346cefd8e82b5093f0dc6f" }
 url = "2.5.4"
 uuid = "1.12.1"
 vodozemac = { version = "0.9.0", features = ["insecure-pk-encryption"] }

Cargo.toml

@@ -48,10 +48,14 @@ pub fn export(attr: TokenStream, item: TokenStream) -> TokenStream {
 
     let attr2 = proc_macro2::TokenStream::from(attr);
     let item2 = proc_macro2::TokenStream::from(item.clone());
-
     let res = match syn::parse(item) {
         Ok(item) => match has_async_fn(item) {
-            true => quote! { #[uniffi::export(async_runtime = "tokio", #attr2)] },
+            true => {
+                quote! {
+                  #[cfg_attr(target_arch = "wasm32", uniffi::export(#attr2))]
+                  #[cfg_attr(not(target_arch = "wasm32"), uniffi::export(async_runtime = "tokio", #attr2))]
+                }
+            }
             false => quote! { #[uniffi::export(#attr2)] },
         },
         Err(e) => e.into_compile_error(),