fix(llm): 🩹 do not re-count devices multiple time after upgrades

[thesan]

✅ Checklist

• npx changeset was attached.
• Covered by automatic tests.
• Impact of the changes:
  • ...

📝 Description

Context

In #9109 devices are added to the store in settings.seenDevices which is supposed to be a uniq device array. However to identify the devices uniquely the reducer uses DeviceModelInfo["deviceInfo"]["targetId"] which actually identifies the firmware version. While discussing the issue the device team pointed out that there is no way to uniquely identify a device.

Fix

As an approximation this PR stores for each model only the last connected device into settings.seenDevices. Then devices are counted based on:

• ble.knownDevices + (each model in settings.seenDevices but not in ble.knownDevices)

❓ Context

• JIRA or GitHub link: LIVE-16680

---

🧐 Checklist for the PR Reviewers

• The code aligns with the requirements described in the linked JIRA or GitHub issue.
• The PR description clearly documents the changes made and explains any technical trade-offs or design decisions.
• There are no undocumented trade-offs, technical debt, or maintainability issues.
• The PR has been tested thoroughly, and any potential edge cases have been considered and handled.
• Any new dependencies have been justified and documented.
• Performance considerations have been taken into account. (changes have been profiled or benchmarked if necessary)

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Name	Status	Preview	Comments	Updated (UTC)
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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
10.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[LucasWerey]

LGTM