Fix negative currency display on sensor card

[MindFreeze]

Proposed change

Fix negative currency values not displaying properly on entity/sensor cards (e.g., showing just - instead of -$12.00).

Intl.NumberFormat.formatToParts() emits minusSign/plusSign as separate parts that weren't mapped in the type conversion, so they were silently dropped. This PR:

1. Maps minusSign/plusSign as "value" parts in computeStateDisplay, preserving native Intl formatting order in the joined output.
2. Fixes entity cards and ha-attribute-value to collect all "value" parts (not just the first), so the sign and digits are combined for display.
3. Uses the last value part index for unit ordering, so the currency symbol position is correct.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (thank you!)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes Issue with displaying negative currency values in the sensor card #30335
• This PR is related to issue or discussion:
• Link to documentation pull request:
• Link to developer documentation pull request:
• Link to backend pull request:

Checklist

• I understand the code I am submitting and can explain how it works.
• The code change is tested and works locally.
• There is no commented out code in this PR.
• I have followed the development checklist
• I have followed the perfect PR recommendations
• Any generated code has been carefully reviewed for correctness and compliance with project standards.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

To help with the load of incoming pull requests:

• I have reviewed two other open pull requests in this repository.