feat: add auto update support

changes/auto-update.md

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+type: added
+area: updater
+
+- Added tray and `subminer -u` update checks for SubMiner releases, including app update prompts, launcher/support asset updates, checksum verification, configurable update notifications, and an opt-in prerelease update channel for beta/RC testing.

changes/first-run-command-line-launcher.md

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+type: added
+area: setup
+
+- Added optional first-run setup controls to install Bun and the `subminer` command-line launcher on Linux, macOS, and Windows.
+- Added a Windows `subminer.cmd` user PATH shim so users can type `subminer` without adding `SubMiner.exe` to PATH.

changes/tray-modal-lifecycle.md

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+type: fixed
+area: tray
+
+- Kept the tray app running when closing tray-launched Yomitan settings.
+- Kept tray-launched Yomitan settings loading from blocking other tray actions.
+- Removed the default native app menu from Yomitan settings so File > Quit cannot put the tray app into a stuck quit state.
+- Disabled Yomitan's embedded popup preview in the tray-launched settings window to avoid renderer hangs during normal sidebar navigation.
+- Skipped heavy Yomitan settings startup preview, storage, dictionary, and Anki controllers when launched from SubMiner to avoid renderer hangs with large dictionary databases.
+- Cached Yomitan settings dictionary metadata after explicit loads to avoid repeated large IndexedDB reads.
+- Serialized copied Yomitan extension refreshes so startup cannot race itself and leave extension loading in an error state.
+- Fixed tray-launched session help focus handling so the modal can close without mpv running.