PromptDock: AI Prompt Vault, {{Variable}} Injector, Token Counter & ChatGPT/Claude/Gemini-to-Markdown Exporter Chrome Extension (MV3 + Source)

Replace $19/mo prompt management extensions with a 100% local-first Manifest V3 Chrome Extension + Full Unminified Source Code. PromptDock works directly inside ChatGPT, Claude, Gemini, Perplexity, and Poe: (1) Save reusable system prompts with dynamic {{variable}} placeholders and inject them straight into the active chat input box in one click, (2) Live token & API cost estimator across GPT-4o, Claude 3.7 Sonnet, and DeepSeek R1, and (3) One-click Export Entire Chat Thread to Clean Markdown (.md) or JSON with preserved code blocks and timestamps. Zero external telemetry, 100% chrome.storage.local.