feat(npcs): inspect cards, Show overlay, and optional external link

Clicking an NPC tile opens description cards (multi-select accordion); Show puts avatars on screen. Optional URL opens a webview tab. Avatar pan in the editor commits on pointer up.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/shared/graph/storylineExportImport.test.ts

@@ -248,6 +248,7 @@ void test('selectNpcsByIds / buildPartialExportProject: explicit NPCs, relations
       disposition: 'neutral',
       imageOffset: { x: 0, y: 0 },
       imageScale: 1,
+      externalUrl: '',
     },
     {
       id: n2,
@@ -261,6 +262,7 @@ void test('selectNpcsByIds / buildPartialExportProject: explicit NPCs, relations
       disposition: 'neutral',
       imageOffset: { x: 0, y: 0 },
       imageScale: 1,
+      externalUrl: '',
     },
     {
       id: n3,
@@ -274,6 +276,7 @@ void test('selectNpcsByIds / buildPartialExportProject: explicit NPCs, relations
       disposition: 'neutral',
       imageOffset: { x: 0, y: 0 },
       imageScale: 1,
+      externalUrl: '',
     },
   ];
   const relations: ProjectNpcRelation[] = [
@@ -364,6 +367,7 @@ void test('buildPartialExportProject: keeps npcTokens only for exported NPCs', (
         disposition: 'neutral',
         imageOffset: { x: 0, y: 0 },
       imageScale: 1,
+      externalUrl: '',
     },
       {
         id: n2,
@@ -377,6 +381,7 @@ void test('buildPartialExportProject: keeps npcTokens only for exported NPCs', (
         disposition: 'neutral',
         imageOffset: { x: 0, y: 0 },
       imageScale: 1,
+      externalUrl: '',
     },
     ],
   });
@@ -430,6 +435,7 @@ void test('mergeStorylinesIntoProject: remaps npcTokens to created NPC ids', ()
         disposition: 'neutral',
         imageOffset: { x: 0.1, y: -0.1 },
       imageScale: 1,
+      externalUrl: '',
     },
     ],
   });
@@ -489,6 +495,7 @@ void test('mergeStorylinesIntoProject: imports all NPCs from export bundle', ()
         disposition: 'neutral',
         imageOffset: { x: 0, y: 0 },
       imageScale: 1,
+      externalUrl: '',
     },
     ],
   });