Gigacode: Wire ESC to abort turn via API

[NathanFlurry]

Description

Pressing ESC in Gigacode should cancel the current in-progress turn. This depends on the abort API endpoint being implemented first (#136).

Implementation

1. When the user presses ESC during an active turn, call POST /v1/sessions/{sessionId}/abort
2. Show the partial response received so far
3. Allow the user to send a new message immediately after

Depends on

• API: Add abort/cancel turn endpoint #136 — API: Add abort/cancel turn endpoint

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