input: Support configurable wrapping indent (#2629)

## Description

- Support `WrappingIndent`
  - Some: Wrapped lines get the same indentation as the parent
  - None: No indentation. Wrapped lines begin at column 1
- Fix the current long text rendering with `soft_wrap` enabled
  - Add left offset on continuation wrapped lines
  - Fix selection corner segments

## Screenshot

**Before**
<img width="548" height="819" alt="Before"
src="https://github.com/user-attachments/assets/a52cdd86-39e9-4f21-a4ce-e40f88596b1b"
/>

**After**
| Same                       | None                       |
| ---------------------------- | --------------------------- |
| <img width="592" height="863" alt="Screenshot 2026-08-04 at 10 52
15 PM"
src="https://github.com/user-attachments/assets/1e826050-d597-4cd9-a092-fd351aad3027"
/> | <img width="592" height="863" alt="After"
src="https://github.com/user-attachments/assets/897eb26c-fbd8-4655-b8a4-e2e2721abd8a"
/> |

## Break Changes

Set the default wrapping indent to `Same`.

## How to Test

Please describe the tests that you ran to verify your changes. Provide
instructions so we can reproduce.

## Checklist

- [ ] I have read the [CONTRIBUTING](../CONTRIBUTING.md) document and
followed the guidelines.
- [ ] Reviewed the changes in this PR and confirmed AI generated code
(If any) is accurate.
- [ ] Passed `cargo run` for story tests related to the changes.
- [ ] Tested macOS, Windows and Linux platforms performance (if the
change is platform-specific)