PromptDrive

Build me a local prompt library to replace PromptDrive. Requirements: - A single-process Node app (Express + better-sqlite3, vanilla HTML/CSS/JS, no build step) serving a web UI on localhost:4321. - Prompts have a title, body, notes, a folder, and tags. Store everything in one SQLite file next to the app; create the schema on first run. - Full-text search across title, body, and tags with SQLite FTS5, filtering live as I type. - Support {{variable}} placeholders in prompt bodies: opening a prompt renders one input per distinct placeholder and shows the filled prompt update live. - One-click copy of the filled prompt with navigator.clipboard and a brief copied confirmation. - Import and export the whole library as one JSON file from the UI; also export any folder as Markdown, one file per prompt. - Keyboard-first: / focuses search, arrow keys move through results, Enter opens, c copies. - No accounts, no cloud, no telemetry, no API calls: this is a filing cabinet, not a chat client. Deliberately out: team sharing, comments, the browser extension, and running prompts against models. - Include a README with install and run steps, backup advice (copy the .sqlite file), and a seed script that loads five example prompts.