Add design folder and README

design/logs_window.md

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+# Logs Window Feature
+
+**Purpose**: Live‑tail container logs for a pod/deployment/statefulset.
+
+**Implementation**:
+- Backend streams `kubectl logs --follow` over a WebSocket.
+- Front‑end displays lines in the same `<pre>` area as Detail Window.
+- Auto‑scroll to bottom when new lines arrive unless the user has manually scrolled up (detect `scrollTop + clientHeight < scrollHeight`).
+- Color‑code log levels: `ERROR` → `#ef6f6f`, `WARN` → `#e8b54a`, `INFO` → `#b9c6d8`.
+- No input handling – all keypresses are routed to the canvas (unless the user focuses the filter in a collection window).
+
+**Interaction**:
+- Click on a result in Spotlight or Collection with **Alt+L** to open a Logs window inside a new or existing Krate.
+- Resize like any Detail Window; sibling windows resize proportionally.
+- Double‑click header or press `z` to maximize.
+
+**State** (`Window` type `logs`).