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/inc/bootstrap.php

@@ -381,6 +381,39 @@ $db->exec('CREATE TABLE IF NOT EXISTS collab_card_locks (
 )');
 $db->exec('CREATE INDEX IF NOT EXISTS idx_collab_card_locks_expires ON collab_card_locks(expires_at)');
 
+// Read-later items: cards the tenant opted into sending to the relay for
+// distraction-free reading in the mobile zen view. Stored at-rest under the
+// inter-tenant key (same pattern as messages). Hard-deleted on removal —
+// no offline-sync need, the hyprcrd client is the source of truth.
+$db->exec('CREATE TABLE IF NOT EXISTS read_items (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    tenant_id INTEGER NOT NULL,
+    relay_uid TEXT NOT NULL,
+    title TEXT NOT NULL DEFAULT "",
+    body TEXT NOT NULL DEFAULT "",
+    hero_filename TEXT,
+    created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    updated_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    UNIQUE (tenant_id, relay_uid),
+    FOREIGN KEY (tenant_id) REFERENCES tenants(id) ON DELETE CASCADE
+)');
+$db->exec('CREATE INDEX IF NOT EXISTS idx_read_items_tenant_updated ON read_items(tenant_id, updated_at DESC)');
+
+// Read attachments (inline images referenced by read items). Encrypted blobs
+// scoped to a tenant + read_item. The reader UI serves these through a
+// session endpoint so the browser sees decrypted bytes.
+$db->exec('CREATE TABLE IF NOT EXISTS read_attachments (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    tenant_id INTEGER NOT NULL,
+    relay_uid TEXT NOT NULL,
+    filename TEXT NOT NULL,
+    data TEXT NOT NULL,
+    created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    UNIQUE (tenant_id, relay_uid, filename),
+    FOREIGN KEY (tenant_id) REFERENCES tenants(id) ON DELETE CASCADE
+)');
+$db->exec('CREATE INDEX IF NOT EXISTS idx_read_att_lookup ON read_attachments(tenant_id, relay_uid)');
+
 $db->exec('CREATE TABLE IF NOT EXISTS sessions (
     id TEXT PRIMARY KEY,
     tenant_id INTEGER NOT NULL,