Move scroll buttons to title bar, add build info status bar

- Replace broken bottom waveform scroll buttons with title bar < > buttons
- Add scrollLeft()/scrollRight() methods to WaveformDisplay
- Add status bar showing git branch, commit, dirty state, and build timestamp
- Inject git version info via CMake at configure time
- Enable COPY_PLUGIN_AFTER_BUILD
- Increase baseHeight by 20px for status bar

CMakeLists.txt

@@ -17,7 +17,7 @@ juce_add_plugin(Monoslicer
     NEEDS_MIDI_OUTPUT      FALSE
     IS_MIDI_EFFECT         FALSE
     EDITOR_WANTS_KEYBOARD_FOCUS TRUE
-    COPY_PLUGIN_AFTER_BUILD FALSE
+    COPY_PLUGIN_AFTER_BUILD TRUE
     VST3_CATEGORIES        Instrument Sampler
 )
 
@@ -29,10 +29,54 @@ target_sources(Monoslicer PRIVATE
     Source/PianoRollDisplay.cpp
 )
 
+execute_process(
+    COMMAND git rev-parse --short HEAD
+    WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+    OUTPUT_VARIABLE GIT_COMMIT_HASH
+    OUTPUT_STRIP_TRAILING_WHITESPACE
+    ERROR_QUIET
+)
+
+if(NOT GIT_COMMIT_HASH)
+    set(GIT_COMMIT_HASH "unknown")
+endif()
+
+execute_process(
+    COMMAND git symbolic-ref --short HEAD
+    WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+    OUTPUT_VARIABLE GIT_BRANCH
+    OUTPUT_STRIP_TRAILING_WHITESPACE
+    ERROR_QUIET
+)
+
+execute_process(
+    COMMAND git diff --quiet HEAD
+    WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+    RESULT_VARIABLE GIT_DIRTY_RESULT
+)
+
+execute_process(
+    COMMAND git diff --cached --quiet
+    WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+    RESULT_VARIABLE GIT_CACHED_DIRTY_RESULT
+)
+
+set(GIT_DIRTY "")
+if(NOT GIT_DIRTY_RESULT EQUAL 0 OR NOT GIT_CACHED_DIRTY_RESULT EQUAL 0)
+    set(GIT_DIRTY "-dirty")
+endif()
+
+if(GIT_BRANCH)
+    set(GIT_VERSION "${GIT_BRANCH} @ ${GIT_COMMIT_HASH}${GIT_DIRTY}")
+else()
+    set(GIT_VERSION "detached @ ${GIT_COMMIT_HASH}${GIT_DIRTY}")
+endif()
+
 target_compile_definitions(Monoslicer PUBLIC
     JUCE_WEB_BROWSER=0
     JUCE_USE_CURL=0
     JUCE_VST3_CAN_REPLACE_VST2=0
+    GIT_VERSION="${GIT_VERSION}"
 )
 
 target_link_libraries(Monoslicer