feat(settings): copy-and-open button and countdown for Simkl sign-in

[ReichiMD]

What this changes

Follow-up to #740, answering the request there: "Can you implement the same thing for simkl?"

On a phone the Simkl dialog had no button at all — you had to remember the code, open a browser, type simkl.com/pin and then type the code. Now:

• Phone: one button, "Copy code & open Simkl". It copies the code and opens the Simkl PIN page in the same tap; the user long-presses the field and pastes.
• Phone and TV: the dialog shows the time left on the code (countdown + bar), the same as the Trakt dialog.
• The poll loop now uses the same deadline the dialog counts down to and stops exactly at it, like the Trakt loop (before, it could keep the dialog at 0:00 for one more interval).

Why it isn't exactly like Trakt

Trakt takes the code from the link (auth.trakt.tv/activate/<code>), so there the code is filled in for you. Simkl's PIN page doesn't — ARVIO uses Simkl's older sign-in (auth v1), and I checked on a phone: simkl.com/pin/<code> opens with an empty field. So copying the code is the closest we can get with v1. For the same reason:

• the TV QR code still points at the plain simkl.com/pin page, and
• the Simkl dialog uses its own instruction lines instead of the shared settings_activation_instruction_* ones, since those say the code travels with the link or QR.

Simkl's newer sign-in (auth v2) does return a ready-made link with the code in it (verification_uri_complete). Their docs say v1 "is expected to stop working around April 2027". Moving to v2 needs a new app registration, a change to the Simkl proxy, token refresh in the app, and every user reconnecting once — those are your calls, so it's not in this PR. Happy to help with it if you want it.

Not included either: the "connected" / "expired + retry" panels from #740. Those texts are Trakt-specific, and adding them would make this PR bigger. On expiry Simkl keeps its current behaviour (the dialog closes with the "timed out" message).

Files

• SettingsViewModel.kt — simklCodeExpiresAtMillis in the UI state: set on start, cleared everywhere the code is cleared (6 places); the poll loop uses the same deadline.
• SettingsScreen.kt — the Simkl call site passes onOpenUrl (copy + open), its own phone instruction and expiresAtMillis. No change to the shared dialog except one outdated comment.
• values/strings.xml, values-de/strings.xml — 2 new lines; other languages fall back to English, the same as feat(settings): show remaining time, success and expiry in the activation dialog, and put the code in the TV QR code #740.

Testing

• Test build of this exact change (debug, own package): compiles, all unit tests pass.
• Phone: the button copies the code and opens the Simkl PIN page, paste works, the countdown runs, and Simkl connects — ✅ tested on a real device.
• TV: only the countdown is new there; the QR code and text are unchanged. Not checked on a TV.

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created by Claude (Anthropic) on behalf of @ReichiMD

[ProdigyV21]

Reviewed the copy-and-open flow and shared expiry deadline. I also separated Cancel from Disconnect: closing the activation dialog now only cancels polling and clears the dialog, without disconnecting an account or uploading a disconnect. Both Android variants compile and the targeted 128-test batch passes. Live Simkl authorization was not tested with a real account. Original commits/authorship preserved.