chat/clear during streaming orphans server stream

[ssjoleary]

Where

lua/eca/sidebar.lua clear_chat() (after PRs editor-code-assistant#63 promptStop and editor-code-assistant#64 chat/clear merge upstream)

Symptom

User hits :EcaChatClear mid-stream. Local state reset (_is_streaming = false) but server keeps streaming chunks into void.

Fix

Before sending chat/clear, if self._is_streaming, call self:_finalize_streaming_response() — which (after editor-code-assistant#63 merges) sends chat/promptStop first.

Blocker

Needs both upstream PRs merged:

• feat: send chat/promptStop to server on EcaStopResponse editor-code-assistant/eca-nvim#63 (promptStop)
• feat: send chat/clear to server on EcaChatClear editor-code-assistant/eca-nvim#64 (chat/clear)

Size

3-line guard, trivial once blockers land.

Found

Code review on editor-code-assistant#64.