Group pending updates by category on the updates page

[MindFreeze]

Breaking change

Proposed change

Restructures the Settings → Updates page (/config/updates) to group pending updates into categorized cards, replacing the single flat "Installable" card:

1. Home Assistant card at the top — Home Assistant Core / Operating System / Supervisor. No "Update all" (these need to be prioritized).
2. One card per integration that has 2 or more pending updates (e.g., "ESPHome" if multiple ESPHome devices have updates). Each has an "Update all" button.
3. Integrations card bundling single-instance integration updates. Has "Update all".
4. Apps card bundling add-on updates. Has "Update all".
5. The existing Not installable card stays unchanged below.

"Update all" makes one update.install service call with the group's entity IDs — no confirmation dialog, no backup flag.

Implements the design from the last comment of #29910.

cc @marcinbauer-ohf

Screenshots

These are mocked updates

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 #
• This PR is related to issue or discussion: Update multiple update entities at once #29910
• 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 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

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[marcinbauer-ohf]

@MindFreeze can we remove the loading state of the "Update all" button? The ones for each item is enough.