Export notes as Markdown or PDF

The reason to build this is not a missing feature — it is that trusting a
program you maintain alone with years of notes should not mean the notes
can only ever be read by that program.

Reachable from a note's toolbar, a notebook's context menu, and Account →
Alle Notizen exportieren.

Markdown carries over everything with an equivalent: headings, lists,
quotes, code, tables, and task state as `- [x]`. A link to another note in
the same export becomes a relative link to its file; a link to a note
outside it degrades to the plain title rather than leaving a dead
reference. Notes with images or a drawing arrive as a ZIP so the files
travel along, and a multi-note export gets a README index.

PDF goes through the browser's print dialog rather than a bundled PDF
library — the browser already has a good one, and it is the only format
where drawings sit inside the document. Markdown gets them as a PNG
beside the text, with a line saying so, because dropping them silently
would be the wrong kind of quiet.

Two decisions worth recording:

- the ZIP writer is eighty lines here rather than a dependency. Note text
  is small and images are already compressed, so compression bought
  nothing, and stored entries are a handful of fixed-layout records.
- Markdown escaping only covers what changes meaning mid-line, plus a
  leading list or heading marker. Escaping every character Markdown ever
  uses turns a sentence into `Hallo\. Alles gut\!`, which defeats the
  point of choosing a readable format.

42 unit tests on the serialiser and the archive format, plus a browser
suite that unpacks a real download and reads the bytes back.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

readme.md

@@ -18,6 +18,7 @@ A cross-platform note-taking application with rich text editing, freehand drawin
 - **PDF Import & Annotation** — Import PDFs, overlay drawing/highlighting, persistent annotations
 - **Notebooks & Folders** — Create notebooks with custom gradient covers, organize notes by folder
 - **Star/Favorite** — Quick access to important notes
+- **Export** — Any note, notebook or the whole account as Markdown or PDF, entirely in the browser
 - **Dark & Light Mode** — Full theme support with refined color schemes
 
 ### Sync & Storage
@@ -57,6 +58,7 @@ inknote/
 │   │   ├── offlineStore.ts   # IndexedDB wrapper
 │   │   ├── search.ts         # Local full-text index
 │   │   ├── hooks/            # Note data, search, layout, history, drag
+│   │   ├── export/           # Markdown, ZIP and print-to-PDF
 │   │   ├── ui/               # Sidebar, dialogs, icons, palette
 │   │   ├── features/notes/   # List, editor pane, version history
 │   │   ├── features/notebooks/ # Dashboard
@@ -65,6 +67,7 @@ inknote/
 │   ├── public/sw.js          # PWA service worker
 │   ├── nginx.conf            # Static serving + API/WS proxy
 │   └── dockerfile            # Web container
+├── e2e/                      # Browser suites — run with ./e2e/run.sh
 └── readme.md                 # This file
 ```
 
@@ -329,6 +332,7 @@ docker compose -f docker-compose.dev.yml up -d --build   # must be running
 | `search-attachments` | 12 | body-only matches, ranking, umlauts; images as blob URLs, not inline bytes |
 | `history` | 10 | a large deletion is snapshotted, restoring works, restoring is itself undoable |
 | `drawing` | 7 | strokes survive the poller, and match across four viewport widths |
+| `export` | 12 | the downloaded bytes are real Markdown and a real ZIP, unpacked and read back |
 
 Each suite creates a throwaway account through the admin API and deletes it
 afterwards, so runs leave the database as they found it. They need an admin to
@@ -475,6 +479,40 @@ rows behind.
 
 ---
 
+## Export
+
+Notes should not be hostage to this program, so everything can leave it — from a
+single note up to every note in the account, reachable from the note's toolbar,
+a notebook's context menu, and Account → *Alle Notizen exportieren*.
+
+**Markdown** keeps the notes editable elsewhere. Headings, lists, quotes, code,
+tables and task state all have equivalents and are carried over; a link to
+another exported note becomes a relative link to its file, and a link to a note
+outside the export degrades to its plain title rather than a dead reference.
+A note with images or a drawing arrives as a ZIP so the files travel with it,
+and a whole notebook gets a `README.md` index grouped by notebook.
+
+**PDF** goes through the browser's own print dialog rather than a bundled PDF
+library — every browser already has a good one behind *Save as PDF*, and it
+handles fonts and page breaks better than anything that would fit in here. This
+is the format that keeps drawings inside the document.
+
+Two things Markdown cannot represent, and what happens instead:
+
+| | |
+| --- | --- |
+| drawings | rendered to PNG beside the note, with a line in the text saying so |
+| underline | written as `<u>`, which every Markdown renderer passes through |
+
+The ZIP writer is [`export/zip.ts`](frontend/src/export/zip.ts) — about eighty
+lines for stored (uncompressed) entries, rather than a dependency. Note text is
+small and images are already compressed, so there was nothing to gain by
+compressing, and this is one fewer thing to keep updated.
+
+Everything runs in the browser. Nothing is uploaded anywhere to produce a file.
+
+---
+
 ## Drawings
 
 Drawings are **vector strokes**, not bitmaps. Every stroke is recorded in one canonical