test(app): add gtest coverage for previously untested app modules
Add 312 test cases across 14 new files under tests/gtest, covering: - app/common utility headers (tooltypes, projecttypes, nodedatatypes, trackreferencehandle, undowrapper, configwrapper, subtitleapp, ...) - all 8 standardcombos widgets - slider base classes (NumericSliderBase, SliderLadder) - timeline/track handles, marker handle/painting, drag button, elapsed counter - timebased views, selection manager, time target, resizable timeline scrollbar - viewer sizer, display buffer, playback timer, text editor - timeline common helpers, TimelineAndTrackView, TrackView(-item/-splitter) - project explorer views, navigation and undo commands - node view items/edges/connectors/minimap/toolbar/context - node param view sub-widgets - about/export/sequence/footage-properties dialogs - scope widgets (histogram/vectorscope/waveform), managed display - main menu, main window undo commands, viewer/footage panels, engine event bridge - keyframe view handle/input connection, multicam display, node combo box, audio monitor Includes regression tests for the TimelineAndTrackView teardown and TimeScaledObject inverted-limits fixes. Full suite: 2341 tests, 0 failures (64 skips are pre-existing GL-dependent cases under the offscreen QPA).
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