Naming: use Developer Mode instead of Figma's Dev Mode (#2135)

Figma holds a US registration for DEV MODE (US 7574348). Display text only: the view.devMode label, Inspect tab, shortcut row, refusal messages, CLI help, docs and all locale catalogs now say Developer Mode. Command ids, preference keys and saved fields are unchanged; "Dev Mode" stays a search alias in the Actions palette. Adds a naming guard test.

docs/plugins.md

@@ -256,7 +256,7 @@ plugin directory requests (`plugin.directory.*` says so). Import plugins with `p
 | `api` | The plugin API version the plugin was written for: `1` (the default), `2` (panels and settings), `3` (widgets), `4` (saving files, widget fields and property menus) or `5` (panels from widgets). A manifest asking for a newer one than FigCraft runs is refused, so a plugin that needs panels, widgets or `saveFile` fails clearly on an older FigCraft. |
 | `permissions.saveFile` | API 4: `true` lets the plugin offer a file to save (an exporter's output). FigCraft asks the user where it goes with its own Save dialog (a download in the browser); the plugin never gets a path. Manage plugins lists it ("can save files"). A plugin directory's entries don't carry it (their wire format stays as it is), so installing any API 4 plugin from one says it may offer files to save. |
 | `widget` | API 3: `true` when the plugin draws a widget (it's listed in Plugins ▸ Widgets). |
-| `permissions.access` | `read` (the default): commands that leave the document as it is; such plugins also run from Dev Mode's Inspect tab. `write`: edits too. |
+| `permissions.access` | `read` (the default): commands that leave the document as it is; such plugins also run from Developer Mode's Inspect tab. `write`: edits too. |
 | `permissions.commands` | Optional allowlist: exact command ids or prefixes ending in `*` (`node.*`). Empty: any command the access allows. |
 | `commands` | The menu commands, each `{id, label, params?}`. Without any, the plugin has one, `run`, unless it's a widget (a widget needs no command). |
 | `params[]` | `{name, label?, type, default?, options?, min?, max?}`; `type` is `text`, `number` (clamped to `min`/`max`), `boolean`, `select` (one of `options`, a menu), `list` (one of `options`, shown as a list), `slider` (a number between `min` and `max`, both required, shown as a slider with its value beside it) or `color` (hex, `#RRGGBB` or `#RRGGBBAA`). A default that doesn't fit is dropped. |