docs(edge-routing): §ER8 describes the interaction that exists; no right-click menu

[MerciHanrim]

§ER8 describes the interaction that exists

docs/edge-routing.md §ER8 still read like the first design, written before the shapes-and-bends editor of §ER16 was built. It listed a right-click menu on a connection ("Orthogonal route" / "Curved route", "Remove point", "Reset route"), only Curved and Orthogonal, a draggable mid-segment handle for adding points, and arrow-key nudging as deferred. The app has no right-click menu: the canvas wires no context menu, and on the phone and under the edit lock it suppresses the browser's own (Canvas.tsx onContextMenu). Found while answering whether the app supports right-click at all.

What changes

• §ER8 now lists what the app offers, each item checked against Inspector.tsx RouteField and RouteBends.tsx, with §ER16 as the reference for the rules:
• the Route select: Orthogonal / Curved / Straight (Straight was missing); choosing Curved or Straight drops the bend points;
• Add bend: the next click on the line inserts a bend point on that segment, snapped to the grid along it (Alt skips grid snapping but keeps the point on the segment), or Enter inserts one in the middle of the longest editable segment;
• moving a bend handle by drag or by the arrow keys (Shift for a bigger step); removing it with Delete or Backspace, the last one making the route automatic;
• Reset to automatic for a Manual route; the keyboard path for all of it; one undo entry each; the edit lock; the phone (read-only select, no bend tools).
• A new §ER8.1 keeps the earlier design intent apart from the current description and says it was not built; the list describes the currently implemented interactions (no decision about later work).
• Second commit (e551634, Lumi's review): the Alt wording above, and §ER8.1's last sentence no longer says a right-click menu is not planned.
• Corrected together (f1456a6, Lumi): §ER16.2 described the same Alt-click as "at the click"; it now says, as §ER8, that Alt skips grid snapping but keeps the point on the segment (bendAtClick / onSegment). The other Alt descriptions were checked: §ER16.2's handle drag "(Alt: free)" and diagram-layout.md DL4.3 "Alt moves one freely" describe moving a bend handle, where Alt does give a free position (RouteBends.tsx), so they stay. The code comment above bendAtClick also says "(Alt: free)"; it is code, outside this docs PR.

Checks

• Docs only: no product code, no version. check:change-declaration: nothing built or shipped changed, no declaration needed. check:control-bytes: ok.
• PR CI on f1456a6, run 39033140945: success (checks, e2e shards 1–6, production bundle, PWA).
• PR CI on e551634, run 39031565900: success (checks, e2e shards 1–6, production bundle, PWA).
• PR CI on 8610176, run 39027858014: success (checks, e2e shards 1–6, production bundle, PWA).

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