Left-clicking an IJK intersection surface fell through the pick handler
without a matching source info branch, which cleared the current selection
instead of showing cell values in Result Info. Add a branch for
RivIjkIntersectionSourceInfo mirroring the intersection box handling.

The command was offered on the intersection collection and on IJK
intersection nodes, but only copied curve and box intersections: IJK
intersections were silently dropped when copying the collection, and the
menu entry was permanently disabled when only an IJK intersection was
selected. Add copyIjkIntersectionsToOtherViews and include the type in
the selection composition, collapsing the per-type-combination enum
values into a single SEL_INTERSECTION_ITEMS since empty lists are no-ops.

RicPasteIntersectionsFeature was in the IJK intersection context menu but
did not recognize the type: findIntersectionCollection() did not map a
selected IJK intersection to its collection, and the clipboard content
was never searched for IJK intersections. In addition,
RicCopyReferencesToClipboardFeature did not accept the type, so an IJK
intersection could not be copied in the first place. Handle
RimIjkIntersection in both features, mirroring the box intersection
handling.

Cell range filters and the Result Info readout present 1-based grid
indices, so showing 0-based indices here was off by one against the rest
of the UI. Store 1-based values in the PDM fields so the slider editors
display them directly, and convert in the public accessors and setters,
which keep using 0-based grid indices. Also fix the stray double space in
the range group titles.

The axis-change block claimed to re-center the fixed index but only
repeated the clamp performed a few lines above, so remove it. The min/max
ordering comment said the field that did not change is adjusted, while
the code limits the field that did change; fix the comment to match.

The feature appended with appendIjkIntersectionAndUpdate and set the
default values afterwards, which only worked because the scheduled redraw
is asynchronous and the part manager is built lazily. It also repeated
the updateConnectedEditors and selectAsCurrentItem calls already done by
the append. Append without update, set the defaults, then update editors,
select the new item and schedule the redraw once.

Note that setToDefaultValues() cannot run before the append: it resolves
the grid through the parent view, so the intersection must be in the
project tree first.

The geometry generator indexes the hex grid with cell indices computed from the view's main grid, but createHexGridInterface() returns a different case's grid when a separate result definition is active, which could cause out-of-bounds reads. Construct the hex grid directly from the view's main grid so both grids are guaranteed to match, and guard against a null hex grid in calculateArrays().

… accessors

Replace the six-int-reference ijkRange()/setIjkRange() signatures with a typed 0-based bounding box, making the index basing explicit in the API.