dx fmt ignores .rustfmt.toml when formatting whole project

**Problem**

`dx fmt` does not pick up settings from `.rustfmt.toml`. RSX blocks are formatted using rustfmt defaults instead of the project's configuration.

In two places, `indentation_for` is called with the hardcoded string `"."`:

- [autoformat.rs#L56](https://github.com/DioxusLabs/dioxus/blob/b00ff7525901984f3a07fa5cfa175b537b64630b/packages/cli/src/cli/autoformat.rs#L56) (`--raw` mode)
- [autoformat.rs#L90](https://github.com/DioxusLabs/dioxus/blob/b00ff7525901984f3a07fa5cfa175b537b64630b/packages/cli/src/cli/autoformat.rs#L90) (`-f file` mode)

Internally, `indentation_for` runs `cargo fmt -- --print-config current `. When `` is a directory, rustfmt does not walk up to find `.rustfmt.toml` and falls back to defaults. When `` is an actual file (as on [L175](https://github.com/DioxusLabs/dioxus/blob/b00ff7525901984f3a07fa5cfa175b537b64630b/packages/cli/src/cli/autoformat.rs#L175) for the whole-project case), it works correctly.

This can be verified. For example, with `hard_tabs = true` in `.rustfmt.toml`:

```sh
# Does NOT pick up .rustfmt.toml:
cargo fmt -- --print-config current .
# → hard_tabs = false

# Correctly picks up .rustfmt.toml:
cargo fmt -- --print-config current src/main.rs
# → hard_tabs = true
```

May also be related to #3433.

**Steps To Reproduce**

- Create a project with a `.rustfmt.toml` containing any non-default setting (e.g. `hard_tabs = true`)
- Add a component using `rsx!`
- Run `dx fmt -f src/main.rs` or `dx fmt --raw "div {}"`
- Observe that RSX is formatted using rustfmt defaults, ignoring `.rustfmt.toml`

**Expected behavior**

`dx fmt` should respect `.rustfmt.toml` when formatting RSX blocks in all modes.

**Screenshots**

N/A

**Environment:**

- Dioxus version: 0.7.9
- Rust version: 1.87
- OS info: Linux
- App platform: web

**Questionnaire**

I don't have time to fix this right now, but maybe later.