chore(version): bump to 1.2.0

Minor. Two new features, both optional and both behind signing in to a Proton
account:

- Sign in with a Proton account (password, two-factor code, separate mailbox
  password) on desktop, Android and the CLI, and add folders of your own Drive
  — My Files, other devices, shared with me — as library shares next to public
  links. The session lives in the OS credential store, never in shares.json.
- Watch history follows you across devices. Each installation keeps its own
  file on a `proton-stream` device in your Drive and merges everyone else's
  per episode, newest position wins. It syncs at launch, after sign-in, when
  the player closes and every five minutes.

Also: Android offline downloads no longer look stuck (B64), and picking a
metadata match by hand refreshes the title's episodes and artwork.

The catalog schema is unchanged from 1.1.3. A new `sync.json` beside
`shares.json` holds this installation's sync id.

packaging/PKGBUILD

@@ -14,7 +14,7 @@
 #     builds from the registry alone.
 
 pkgname=proton-stream
-pkgver=1.1.3
+pkgver=1.2.0
 pkgrel=1
 pkgdesc="Netflix-style desktop client for Proton Drive public links: browse and stream a share"
 arch=('x86_64')