Fix Jellyfin Login (#76)

changes/358-jellyfin-setup-feedback.md

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+type: fixed
+area: jellyfin
+
+- Fixed the Jellyfin setup popup login path on Windows by using an IPC bridge, showing immediate login progress, and timing out unreachable server login attempts with an inline error.

changes/remove-jellyfin-server-presets.md

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+type: changed
+area: jellyfin
+
+- Removed the Jellyfin setup server presets dropdown; setup now shows a single editable server URL field.

changes/windows-startup-fatal-errors.md

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+type: fixed
+area: windows
+
+- Windows startup failures now show a native error dialog and write fatal details to the SubMiner app log instead of exiting silently.

changes/windows-update-check-crash.md

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+type: fixed
+area: updates
+
+- Windows automatic updates now keep the native `electron-updater`/NSIS install path enabled while routing updater HTTP through main-process fetch, avoiding the delayed app exit seen shortly after launch without requiring `curl.exe`.