0.3.5 — Server Mode Task CRUD Fix

Fixed: Task creation, deletion, drawer save, and board reload now work in server mode (kandown CLI) — all mutations go through the REST API instead of requiring tasksDirHandle.
Changed: Server-mode store actions no longer require tasksDirHandle — they pass null to filesystem.ts helpers which bypass it when isServerMode() is true.
Changed: moveTask and reorderInColumn skip file persistence in server mode (full reload handles sync).
Added: readAllTasksServer() — reads all tasks via the REST API for board reload in server mode.
Changed: README now strongly recommends npm install -g kandown over npx.