Fix -Frames negative range calculation to extract last N frames correctly (off-by-one error), add validation to reject invalid '-%' and '-0' formats with exit code 1, change '%' alone to extract single last frame instead of range, remove duplicate last frame from PNG sequence concat list, update Get-LastFrame.ps1 and Get-Frame.ps1 to clamp out-of-range frame indices instead of erroring and improve error messages with inline stderr output, add -y flag and -- separator to ffprobe calls, replace deprecated

Create-Clip.ps1

@@ -11,7 +11,7 @@
     - start-end: Extract frames from start to end (e.g., "100-200")
     - positive_number: Extract frames from 0 to that number (e.g., "50")
     - -negative_number: Extract last N frames (e.g., "-10")
-    - %: Represents the last frame index. Can be used alone or in ranges (e.g., "%", "10-%", "-%")
+    - %: Represents the last frame index. Can be used alone or in ranges (e.g., "%", "10-%")
     - all: Extract all frames (same as "0-%")
 .PARAMETER Suffix
     Text inserted into the derived -Target name before the file extension. Defaults to "-Clip" and cannot be empty.