rename node to dora-image-view

The repository, the Python package, the entrypoint and the manifest name all
now agree. `plot` was carried over from the upstream opencv-plot node and no
longer described anything here, so the module, the class and the environment
variables follow the node:

  dora_plot/         -> dora_image_view/
  dora_plot/plot.py  -> dora_image_view/view.py
  Plot               -> View
  PLOT_WIDTH/HEIGHT  -> VIEW_WIDTH/HEIGHT
  --plot-width/-height -> --view-width/-height

Breaking for anyone wiring `path: dora-plot` or setting PLOT_WIDTH; nothing is
tagged yet.

pyproject.toml

@@ -1,5 +1,5 @@
 [project]
-name = "dora-plot"
+name = "dora-image-view"
 version = "0.1.0"
 description = "Dora node that overlays bounding boxes and text on an image and displays it in an OpenCV window"
 readme = "README.md"
@@ -21,7 +21,7 @@ dependencies = [
 ]
 
 [project.scripts]
-dora-plot = "dora_plot.main:main"
+dora-image-view = "dora_image_view.main:main"
 
 [dependency-groups]
 dev = ["pytest >= 8.1", "ruff >= 0.9"]
@@ -31,7 +31,7 @@ requires = ["hatchling"]
 build-backend = "hatchling.build"
 
 [tool.hatch.build.targets.wheel]
-packages = ["dora_plot"]
+packages = ["dora_image_view"]
 
 [tool.ruff.lint]
 extend-select = ["D", "I", "N", "RET", "UP"]