Leave hiding and deleting a link to its right-click menu

The inspector of a picked link carried the buttons Hide link and
Delete link below its facts. Both actions are in the right-click
menu of the line since #289, and Delete removes a picked link as
well. The user asked for the buttons to go.

- buildEdgeSection in editor/inspector/edgeSection.ts only
  describes now: the two ends, the type, and for a transition its
  name field.
- The button under several picked links and Delete transition in a
  state machine go with them. They came from the same line of
  code, and the menu offers both.
- The note under several links stays. It speaks of the Delete key.

Tests:
- Gate on melektaus-atx: 212 files, 3260 tests, exit 0.
- e2e 4,6,26 on melektaus-atx: 275 checks, all pass.
- No full run and no smokes. The sum of e2e checks stays at 1676,
  which is reckoned.
- Module 06 now checks that the inspector of a picked link shows
  neither button. Its menu check finds Hide link and Delete link
  only in the menu, where it had to take the one drawn last before.
- Module 26 checks that a picked transition shows no Delete
  transition.
- No unit test names the buttons. No counter-probe was run. The
  old checks found both texts in the inspector, which is the state
  the new ones would fail on.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tools/e2e/06-graph.mjs

@@ -2009,7 +2009,9 @@ export async function graph(t) {
         s.selection.edgeId === 'lk-e1' &&
         same(await drawn(), ['lk-e1']) &&
         Boolean(await find('LINK')) &&
-        Boolean(await find('Delete link')),
+        // Hiding and deleting live in the line's menu alone; the inspector only describes.
+        !(await find('Hide link')) &&
+        !(await find('Delete link')),
       JSON.stringify({ selection: s.selection, drawn: await drawn() }),
     );
     await press('Delete');
@@ -2042,8 +2044,7 @@ export async function graph(t) {
     await click(one.x, two.y + 60);
     await click(two.x, two.y, 'right');
     const offered = Boolean(await find('Hide link'));
-    // The inspector shows a button of the same name; the menu's entry is the one drawn last.
-    const entry = await locate('Delete link', true);
+    const entry = await locate('Delete link');
     await click(entry.x, entry.y);
     const afterMenu = await edges();
     await undo();

tools/e2e/26-state-machine.mjs

@@ -374,12 +374,12 @@ export async function stateMachine(t) {
   const arrowSelection = (await state()).selection;
   await shot('05f-picked');
   check(
-    'clicking a transition picks it: the inspector shows it with its name and the way to delete it',
+    'clicking a transition picks it: the inspector shows it with its name and no button of its own',
     arrowSelection?.kind === 'edge' &&
       arrowSelection.edgeId === alarm?.id &&
       JSON.stringify(await json('__gm.stateMachine.pickedEdges()')) === JSON.stringify([alarm?.id]) &&
       (await has('TRANSITION')) &&
-      (await has('Delete transition')),
+      !(await has('Delete transition')),
     JSON.stringify({ arrowSelection, drawn: await json('__gm.stateMachine.pickedEdges()') }),
   );
   await press('Delete');