bug(FORM-FIELD): Container shape is incorrectly applied for both outlined and filled.

### Is this a regression?

- [ ] Yes, this behavior used to work in the previous version

### The previous version in which this bug was not present was

_No response_

### Description

- Filled container shape only applies to the top half of the container.
- Outline container shape incorrectly uses the shape dimensions as the padding causing very wide fields.

### Reproduction

StackBlitz link: https://stackblitz.com/edit/components-issue-starter-sd5v83bx?file=package.json
Steps to reproduce:
1. Override form-field-overrides with "filled-container-shape: var(--mat-sys-corner-full),"
2. Override form-field-overrides with "outlined-container-shape: var(--mat-sys-corner-full),"

### Expected Behavior

The form-fields should be a rectangular with fully rounded corners.

### Actual Behavior

Filled form-fields are only rounding the top half.
Outlined form-fields are become 18000px wide

### Environment

- Angular: 19.2.6
- CDK/Material: 19.2.9
- Browser(s): Chrome
- Operating System (e.g. Windows, macOS, Ubuntu): Mac

提供された StackBlitz の再現と、filled フィールドおよび outlined フィールド用の form-field-overrides 設定から始めます。指定された Angular と Material のバージョンで動作を確認し、そのうえで、outlined フィールドの幅が過度に広くならず、両方のバリエーションの角が完全に丸みを帯びた長方形になっていることを確認します。

索引モデルが issue の本文から書いたものです。