v2.0.5 — Read feature (mobile zen reader on the relay)

Per-card opt-in push to the relay for distraction-free mobile reading.
Not tag-based: a real cards.read_push column so the reading state
stays independent of whatever tags the user organises by.

hyprcrd
- cards.read_push column (0/1, default 0) via Database migration.
- POST /api/cards + PATCH /api/cards/{id} accept read_push; save hook
  posts the card (title+body, encrypted) and referenced images
  to the relay's /api/read endpoint. First inline image is flagged
  as the hero. Toggle-off / DELETE wipes the remote copy.
- Detail-bar toggle button ("Read" → "On relay") with filled book
  icon + inverted accent background when active; outline book icon
  in the bottom meta row of the board card when read_push=1.

relay
- read_items + read_attachments tables, encrypted under the
  inter-tenant key like messages (dual-format envelope).
- Client API: POST /api/read, DELETE /api/read/{uid}, POST
  /api/read-attachments. Session API: GET /api/read (list),
  GET /api/read/{uid} (single decrypted), GET /api/read-attachments/
  {uid}/{filename} (serves decrypted image bytes).
- Payload size caps raised to 15MB (attachments) / 2MB (items).
- New nav tab + view: list with thumbnails, click opens a zen reader
  overlay. Reader caps article width at 680px, bumps type to 17px/1.7,
  renders a minimal markdown subset (headings, lists, code fences,
  blockquotes, links, inline images), rewrites uploads/ references
  to the session-authed image endpoint. Escape closes the reader.
- Mobile-first: wider touch targets, tighter padding at ≤640px.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

relay/index.php

@@ -69,8 +69,11 @@ if (str_starts_with($route, '/api/')) {
     // Attachment routes handle binary blobs; everything else is JSON metadata.
     // A ~150KB image becomes a ~275KB envelope after base64 + GCM framing,
     // so 256KB would silently drop any non-trivial image on collab pushes.
-    $isAttachmentRoute = in_array($route, ['/api/attachments', '/api/attachments/upload', '/api/collab-attachments'], true);
-    $sizeLimit = $isAttachmentRoute ? 15728640 : 262144;
+    $isAttachmentRoute = in_array($route, ['/api/attachments', '/api/attachments/upload', '/api/collab-attachments', '/api/read-attachments'], true);
+    // Read items carry the full card body (markdown), which can be much
+    // longer than a chat message — raise the JSON-metadata cap for the
+    // read endpoint too.
+    $sizeLimit = $isAttachmentRoute ? 15728640 : ($route === '/api/read' ? 2097152 : 262144);
     if ($contentLength > $sizeLimit) jsonResponse(['error' => 'payload too large'], 413);
 
     // Each route file contains its handlers as if-blocks that exit on
@@ -85,6 +88,7 @@ if (str_starts_with($route, '/api/')) {
     require __DIR__ . '/inc/routes/collab-cards.php';
     require __DIR__ . '/inc/routes/collab-locks.php';
     require __DIR__ . '/inc/routes/shopping.php';
+    require __DIR__ . '/inc/routes/read.php';
 
     jsonResponse(['error' => 'not found'], 404);
 }