fix: make continue startup behavious passive. Fixes #254 (#264)

 # Summary

Makes the default `Continue` startup behavior passive so launching
spotatui no longer
transfers playback to the native Spotatui Connect device. Device
transfer, shuffle, and
playback start now only run for `Play` startup behavior, with focused
tests covering
  the startup device decision paths.

  Fixes #254 

  # Testing

  - `cargo fmt --all`
- `cargo test --no-default-features --features telemetry runtime::tests`
    - 9 passed; 0 failed
- `cargo clippy --no-default-features --features telemetry -- -D
warnings`
  - `cargo test --no-default-features --features telemetry`
    - 182 passed; 0 failed

  # Additional notes

  No screenshots needed; this is startup/runtime behavior only.

Author: LargeModGames

CHANGELOG.md

@@ -6,6 +6,7 @@
 
 - **Playbar cover art sizing**: Added configurable playbar cover art sizing and improved layout handling so the image, controls, and progress bar scale cleanly in the playbar ([#253](https://github.com/LargeModGames/spotatui/issues/253)).
 - **Mouse song selection**: Changed song-table left clicks so the first click highlights a row and a second click on the highlighted row selects/plays it, matching arrow-key plus Enter behavior ([#258](https://github.com/LargeModGames/spotatui/issues/258)).
+- **Startup playback hijacking**: Made the default `Continue` startup behavior passive so launching spotatui discovers devices without transferring playback to the native Spotatui Connect device ([#254](https://github.com/LargeModGames/spotatui/issues/254)).
 
 ## [v0.38.2] - 2026-05-10