feat(tui): Add Edge Management to Edit Form

[JasonWarrenUK]

feat(tui): Add Edge Management to Edit Form

Overview

CP.11 — Edit forms now support viewing, removing, and creating edges directly from the form UI.

Summary

Like a switchboard operator who can now see all the lines plugged into a socket and unplug the dodgy ones while patching in fresh connections — the edit form has grown tentacles of awareness about its node's relationships in the graph.

Tip

No migration steps needed. The index parameter is nil-safe — edit forms degrade gracefully when no index is available.

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Changes

internal/tui/form.go — edge management in edit forms

• Added edgeEntry struct to describe connected edges with direction, type, target, and label
• Added index types.GraphIndex field to formPane struct
• Added edge state fields: existingEdges, keptEdgeIDs, newEdgeType, newEdgeTarget
• Added buildEdgeEntries() to query the index for all edges connected to a node
• Added shortNodeLabel() to resolve target node titles for display
• Added appendEdgeFields() to build huh multi-select (existing edges) and select/input (new edge) fields
• Added applyEdgeChanges() to diff kept vs existing edges and delete/create on submit
• Updated all three edit constructors (newEditTaskFormPane, newEditJournalFormPane, newEditNoteFormPane) to accept index parameter and call appendEdgeFields
• Updated all three exported wrappers to pass through the index parameter

internal/tui/app.go — wire index into edit forms

• handleEditNode() now passes m.index to all edit form constructors

internal/tui/form_test.go — edge management tests

• Added formTestIndex stub implementing GraphIndex
• Added deletedIDs tracking to formTestStore
• Updated existing edit form tests for new constructor signature (pass nil index)
• Added 8 new tests for CP.11:
  • TestEditFormShowsExistingEdges — multi-select appears when edges exist
  • TestEditFormShowsAddEdgeType — add-edge fields always present
  • TestEditFormNilIndexNoEdgeFields — nil index does not panic
  • TestEditFormEdgeLabelsShowTargetTitle — section renders with edges
  • TestEditFormIncomingEdgeShowsSection — incoming edges detected
  • TestEditJournalFormShowsEdgeFields — journal forms get edge fields
  • TestEditNoteFormShowsEdgeFields — note forms get edge fields
  • TestEditFormNoExistingEdgesSection — no multi-select when no edges

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