[TeeJayBaker]

Fix or feature

• Fix
• Feature

Feature from outside: #1043.

What and why

Monster Train 2 and Overcooked! All You Can Eat have present_interval display and no fps_target, so they run at 60 fps with no 30 fps choice in the launcher (only DM_PRESENT_INTERVAL=game in an env file). Patch 0104 adds a Frame rate row for DM_PRESENT_INTERVAL (30 fps = game, 60 fps = display, default display), shown for DM_GAME_PRESENT_DISPLAY==1&DM_GAME_FPS_TARGET==0, and lets settings.py take several shown conditions joined by &. A game with fps_target keeps its one Frame rate row. The launcher draws the row from the game's launcher.json with its own strings, so frontend/l10n gets the label and both options in all seven languages, the same words as DM_FPS_TARGET's Frame rate, 30 fps and 60 fps.

Split out of #372 and stacked on it, because it edits Overcooked's profile files. The first commit here is #372's. This PR's change is the last commit.

Checked

• Tests: python3 tools/engine.py check (70 patches apply cleanly to c78d7375bea9). In engine/: test_launcher_settings.py (Monster Train 2 and Overcooked get the row; Monster Hunter Rise, display with fps_target, keeps only DM_FPS_TARGET; Super Mario Bros. Wonder gets neither), test_settings.py, test_docs.py. In frontend/: swift test (LaunchOptionsTests checks that every row has its strings; GermanLocalizationTests now lists the two fps options, which read the same in German).
• Run on a Mac: Overcooked (0100F28011892000, 1.0.11) from the launcher on an M1 Pro, macOS 26.7.2. Launch options shows Frame rate, and with 30 fps chosen the log reads launcher: env DM_PRESENT_INTERVAL=game (saved choice) and interval mode game (original semantics). Not checked: Monster Train 2, iOS.

Screenshots

None. The row is drawn like every other choice, with the existing Frame rate wording.

Scope

• No engine file (dm/, scripts/, docs/, ref/) is added to the repository: a change there is a patch in patches/ (a commit in engine/, then tools/engine.py export, and tools/engine.py check passes), with its Upstream-Status
• A fix to the engine or a game profile also goes to seedds/nxnative as a PR in parallel: this PR's patch says forwarded seedds/nxnative#..., or pending until that PR is open
• No keys, game files or data extracted from a game in the change or the attachments

[v0lumehi]

Thank you @TeeJayBaker. Your change is part of #1097, the launcher UI overhaul, with you as co-author. Closing this one in favor of it. Please have a look there if something of yours is missing or changed.