feat(FN-3261): wire droid bundled plugin and improve agent detail view

Merged four step commits bringing AgentDetailView improvements with model favoritism UI, bundled plugin install wiring for the droid runtime, aligned documentation between settings reference and the plugin README, plus mobile layout refinements with safe-area padding test updates.

Fusion-Task-Id: FN-3261

plugins/fusion-plugin-droid-runtime/README.md

@@ -1,9 +1,19 @@
 # Droid Runtime Plugin
 
-Provides the Droid CLI runtime/provider integration for Fusion.
+First-class Droid plugin package under `plugins/fusion-plugin-droid-runtime`.
+
+## What this package is
+
+- Canonical home for Droid runtime/provider plugin code.
+- Installable from dashboard **Settings → Plugins → Fusion Plugins → Bundled Plugins** via path `./plugins/fusion-plugin-droid-runtime`.
+- Plugin identity is stable: `fusion-plugin-droid-runtime`.
+
+## Migration context
+
+- FN-3261 established this package as the official landing zone so Droid plugin work does not need ad-hoc layouts.
+- Runtime/provider logic that used to live in `packages/droid-cli` is now owned here; `@fusion/droid-cli` remains a compatibility shim surface where needed.
+
+## Key IDs
 
 - Runtime ID: `droid`
 - Provider ID: `droid-cli`
-- Exports probe helpers and runtime adapter for dashboard + engine integration.
-
-`@fusion/droid-cli` now acts as a compatibility shim and delegates to this plugin-owned implementation.