refactor(core): more bounds for better errors from #1623

[chippers]

What kind of change does this PR introduce? (check at least one)

• Bugfix
• Feature
• New Binding Issue #___
• Code style update
• Refactor
• Build-related changes
• Other, please describe:

Does this PR introduce a breaking change? (check one)

• Yes. Issue #___
• No (no release since the breaking change refactor(core): simplify usage of app event and window label types #1623)

The PR fulfills these requirements:

• When resolving a specific issue, it's referenced in the PR's title (e.g. fix: #xxx[,#xxx], where "xxx" is the issue number)
• A change file is added if any packages will require a version bump due to this PR per the instructions in the readme.

If adding a new feature, the PR's description includes:

• A convincing reason for adding this feature (to avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it)

Other information:
finish change file from #1623
+
adds better errors in cases where a double reference was used

error[E0277]: the trait bound `std::string::String: Borrow<&str>` is not satisfied
  --> examples/api/src-tauri/src/main.rs:23:14
   |
23 |       window.emit_all(&"rust-event", Some(0));
   |              ^^^^^^^^ the trait `Borrow<&str>` is not implemented for `std::string::String`
   |
   = help: the following implementations were found:
             <std::string::String as Borrow<str>>