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dbe8e39aa9
The 1460-byte MULTIPART_CHUNK_SIZE buffer was moved from heap to stack in #13549, but the httpd task stack is only ~4096-5632 bytes. This causes a stack overflow crash when processing OTA uploads, especially on configs with BLE components that add additional stack pressure. Move it back to heap since this buffer is only used during OTA uploads (not a hot path), so heap fragmentation is not a concern here. Fixes stack overflow: "A stack overflow in task httpd has been detected"
