v0.3.6

yamlover 0.3.6 — content pane shows index progress on cold start

Opening a never-indexed folder (e.g. the desktop app's first run) flashed a red
"no such node/endpoint: /api/json?path=:" in the content pane: the SPA fetches the
root before the initial background index has created the root node, so /api/json
404s. It already self-heals (the index-done diff bumps refreshSignal → NodeView
refetches), and the LEFT pane already showed "indexing…" — but the content pane
rendered NodeView's raw error meanwhile.

Mirror the left pane: while there is no tree yet and an index task is running, show
the task progress instead of NodeView. Once the tree lands NodeView renders and
fetches normally. Pure client/UX fix; typecheck + client tests pass.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>