Add insert waypoint button between mission items

[1Blademaster]

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[Copilot]

Pull request overview

Adds UI affordances to insert new mission waypoints (and fence polygon vertices) directly from the map by rendering clickable midpoint “+” markers between adjacent items, with corresponding Redux reducers to insert and re-sequence items.

Changes:

• Added insertDrawingItemAfter (generic) and insertFencePolygonVertex (polygon-aware) reducers to insert items and re-sequence lists.
• Rendered midpoint insert buttons on the mission and fence map overlays and wired them to the new reducers.
• Hardened mission/fence/rally table numeric input handling by ignoring non-finite/empty intermediate values from Mantine NumberInput.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
gcs/src/redux/slices/missionSlice.js	Adds reducers for inserting a mission item after an existing item and inserting a fence polygon vertex while updating seq/param1/z.
gcs/src/components/missions/rallyItemsTableRow.jsx	Adds numeric parsing guard to avoid writing invalid intermediate input values into state.
gcs/src/components/missions/missionItemsTableRow.jsx	Adds numeric parsing guards (and a coordinate-specific helper) for mission item table edits.
gcs/src/components/missions/fenceItemsTableRow.jsx	Adds numeric parsing guard to avoid writing invalid intermediate input values into state.
gcs/src/components/mapComponents/missionItems.jsx	Computes mission path midpoints and renders clickable midpoint insert buttons that dispatch insertion actions.
gcs/src/components/mapComponents/midpointInsertButton.jsx	New reusable map marker button component for midpoint “+” insertion.
gcs/src/components/mapComponents/fenceItems.jsx	Groups fence polygons, computes edge midpoints, renders insert buttons, and dispatches polygon-vertex insertion actions.

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