Set http_request buffer_size_tx: 2048 - the real Out of buffer fix

[bharvey88]

Version: 26.7.8.8

What does this implement/fix?

Third time's the charm on HTTP_CLIENT: Out of buffer, and this one is confirmed against the IDF source rather than inferred: esp_http_client emits "Out of buffer" from request-line composition (http_client_prepare_first_line in esp_http_client.c) - GET <path>?<query> must fit buffer_size_tx. GitHub's release-asset redirect targets a signed URL with a ~850-character query string, so the follow-up request could never be built in the 512-byte default TX buffer. That's why the failure is at esp_http_client_open (before anything is sent), and why raising the RX buffer (#93, #94) didn't help - the error was reproduced unchanged on hardware running 26.7.8.7.

buffer_size_tx: 2048 on all images. The RX bump from #94 stays (the first hop's 3.6 KB CSP header is still real).

Types of changes

• Bugfix (fixed change that fixes an issue)
• New feature (thanks!)
• Breaking change (repair/feature that breaks existing functionality)
• Dependency Update - Does not publish
• Other - Does not publish
• Website of github readme file update - Does not publish
• Github workflows - Does not publish

Checklist / Checklijst:

• The code change has been tested and works locally
• The code change has not yet been tested

If user-visible functionality or configuration variables are added/modified:

• Added/updated documentation for the web page

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 084067ab-9628-4e25-ac3b-81284ace9731

📥 Commits

Reviewing files that changed from the base of the PR and between b5a8de4 and 8ea86a8.

📒 Files selected for processing (4)

• Integrations/ESPHome/Core.yaml
• Integrations/ESPHome/MSR-1.yaml
• Integrations/ESPHome/MSR-1_BLE.yaml
• Integrations/ESPHome/MSR-1_Factory.yaml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-tx-buffer

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