…ents. (#1452)

closes #1458

…View2 (#1451)

* Improve custom URL scheme handler robustness and error handling

* re-add comments

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Co-authored-by: FabianLars <github@fabianlars.de>

* chore: Set and test `rust-version`

* Update build.yml

* Update Cargo.toml

* commit lockfile

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: FabianLars <github@fabianlars.de>

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

ref: rust-windowing/winit#3712
ref: https://github.com/zed-industries/zed/blob/7bddb390cabefb177d9996dc580749d64e6ca3b6/crates/gpui/src/platform/windows/events.rs#L1418-L1454

Fixes two issues which could cause race conditions when navigating between pages while custom protocol requests are in progress on macOS and iOS:
- The `obc2/catch-all` feature turns all Objective-C exceptions into panics, preventing `obc2::exception::catch(...)` from working.
- The `webview` and `task` objects passed to `start_task` were not retained, leading to use-after-free issues in the `responder`.
- `WryWebView::remove_custom_task_key` is called from both `stop_task` and `response` which may be in different threads, so `custom_protocol_task_ids` needs to be protected by a `Mutex`.

Closes #1189

Co-authored-by: pewsheen <pewsheen@users.noreply.github.com>