feat(coding-agent): footer honors display.showProvider flag

Add a new `display.showProvider` setting (default true) under the
Display group. When enabled, the active model in the bottom-right
footer renders as `provider/id` (e.g. `opencode-go-3/deepseek-v4-flash`)
instead of just `id`. Disambiguates which provider is serving a model
when several are configured under different keys.

packages/coding-agent/src/config/settings-schema.ts

@@ -1133,6 +1133,18 @@ export const SETTINGS_SCHEMA = {
 		},
 	},
 
+	"display.showProvider": {
+		type: "boolean",
+		default: true,
+		ui: {
+			tab: "appearance",
+			group: "Display",
+			label: "Show Provider in Footer",
+			description:
+				"Prefix the active model in the footer with its provider (e.g. `opencode-go-3/deepseek-v4-flash`). Disambiguate which provider is serving a model when several are configured.",
+		},
+	},
+
 	"display.cacheMissMarker": {
 		type: "boolean",
 		default: false,

packages/coding-agent/src/modes/components/footer.ts

@@ -194,7 +194,12 @@ export class FooterComponent implements Component {
 		let statsLeft = statsParts.join(" ");
 
 		// Add model name on the right side, plus thinking level if model supports it
-		const modelName = state.model?.id || "no-model";
+		// The `display.showProvider` flag prefixes the active provider when several
+		// providers serve the same model id (e.g. `opencode-go-3/deepseek-v4-flash`
+		// vs `deepseek/deepseek-v4-flash`).
+		const showProvider = settings.get("display.showProvider");
+		const providerPrefix = showProvider && state.model?.provider ? `${state.model.provider}/` : "";
+		const modelName = `${providerPrefix}${state.model?.id || "no-model"}`;
 
 		// Add thinking level hint when the current model advertises supported efforts
 		let rightSide = modelName;