New "Scan image" button in the input pane header:
- Opens the phone's rear camera (capture=environment) or a desktop
file picker via a hidden <input type="file">.
- On image selected, lazy-imports tesseract.js from esm.sh — no
bundling, no Docker image growth.
- Language follows the "From" dropdown (ISO 639-2 mapping for the
30 currently-supported languages). "Auto-detect" loads the
eng+por+deu+nld pack and lets tesseract pick.
- Progress status renders below the input (engine load → OCR
percentage → "done in Xs").
- Result replaces the editor contents; existing vim bindings,
Shift-H/L nav, Ctrl-Enter translate all keep working.
First scan triggers a ~5 MB Tesseract WASM download plus the chosen
language pack (~3-10 MB). Cached by the browser after.
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