fix(web): link plugins to desktop app

Keep browser entry points visible while explaining that native
plugins require a desktop install.

Refs #567

src/app/commands/mod.rs

@@ -236,6 +236,8 @@ pub fn start_allowed(cmd: &str) -> bool {
             | "REPORT"
             | "CHANGELOG"
             | "ABOUT"
+            | "PLUGINS"
+            | "PLUGINMANAGER"
             | "DONATE"
             | "WEBVERSION"
             | "HELP"
@@ -245,8 +247,6 @@ pub fn start_allowed(cmd: &str) -> bool {
             | "CUILOAD"
             | "CUIIMPORT"
     )
-        || (!cfg!(target_arch = "wasm32")
-            && matches!(cmd, "PLUGINS" | "PLUGINMANAGER"))
 }
 
 // ── Autocomplete registry — one-shot commands ──────────────────────────────

src/app/commands/view.rs

@@ -212,17 +212,10 @@ impl OpenCADStudio {
                 return Some(Task::done(Message::AboutOpen));
             }
 
-            #[cfg(not(target_arch = "wasm32"))]
             "PLUGINS" | "PLUGINMANAGER" => {
                 return Some(Task::done(Message::PluginManagerOpen));
             }
 
-            #[cfg(target_arch = "wasm32")]
-            "PLUGINS" | "PLUGINMANAGER" => {
-                self.command_line
-                    .push_info("External plugins are available in the desktop app.");
-            }
-
             "CHANGELOG" => {
                 crate::sys::open_url("https://github.com/HakanSeven12/OpenCADStudio/releases");
                 self.command_line.push_info("Opening release notes...");

src/app/mod.rs

@@ -521,6 +521,7 @@ pub(super) struct OpenCADStudio {
     external_plugins: Vec<crate::plugin::external::ExternalPlugin>,
     /// Ids of external packages actually loaded this session (a subset of
     /// `external_plugins` — compatible, with a library, dlopen'd at startup).
+    #[cfg_attr(target_arch = "wasm32", allow(dead_code))]
     loaded_plugin_ids: rustc_hash::FxHashSet<String>,
     /// Curated plugin registry fetched from the OpenCADStudio repo.
     plugin_registry: Vec<crate::plugin::external::RegistryEntry>,
@@ -1313,7 +1314,6 @@ impl ClipboardDeps {
 pub enum ModalKind {
     About,
     Shortcuts,
-    #[cfg_attr(target_arch = "wasm32", allow(dead_code))]
     PluginManager,
     UpdateNotice,
     Layers,

src/app/update/mod.rs

@@ -4058,8 +4058,7 @@ impl OpenCADStudio {
             Message::PluginManagerOpen => {
                 #[cfg(target_arch = "wasm32")]
                 {
-                    self.command_line
-                        .push_info("External plugins are available in the desktop app.");
+                    self.active_modal = Some(super::ModalKind::PluginManager);
                     return Task::none();
                 }
                 #[cfg(not(target_arch = "wasm32"))]

src/app/view/mod.rs

@@ -2300,11 +2300,11 @@ pub(super) fn start_page_view<'a>(
         .into(),
         outline_btn("Options", Message::OptionsOpen).into(),
     ];
-    // External plugins are native dynamic libraries and the web build is
-    // already in the browser, so both actions are desktop-only.
+    secondary_items.push(outline_btn("Plugins", Message::PluginManagerOpen).into());
+    // The web build is already in the browser, so only the desktop offers a
+    // link to the web version.
     #[cfg(not(target_arch = "wasm32"))]
     {
-        secondary_items.push(outline_btn("Plugins", Message::PluginManagerOpen).into());
         // Filled with the active theme's primary colour.
         secondary_items.push(
             button(text("OCS Web").size(14))

src/app/view/modal.rs

@@ -71,31 +71,45 @@ impl OpenCADStudio {
                 520,
                 500,
             ),
-            super::super::ModalKind::PluginManager => sized(
-                crate::ui::window::plugin_manager::view_window(
-                    &self.disabled_plugins,
-                    &self.external_plugins,
-                    &self.loaded_plugin_ids,
-                    crate::ui::window::plugin_manager::MarketView {
-                        registry: &self.plugin_registry,
-                        registry_loading: self.plugin_registry_loading,
-                        registry_error: self.plugin_registry_error.as_deref(),
-                        registry_error_details_open: self.plugin_registry_error_details_open,
-                        input: &self.plugin_repo_input,
-                        search: &self.plugin_search_input,
-                        repos: &self.plugin_repos,
-                        release_tags: &self.repo_release_tags,
-                        selected_tag: &self.repo_selected_tag,
-                        selected_repo: self.selected_plugin_repo.as_deref(),
-                        readmes: &self.plugin_readmes,
-                        readme_loading: &self.plugin_readme_loading,
-                        status: &self.marketplace_status,
-                    },
-                    &self.active_theme,
-                ),
-                940,
-                600,
-            ),
+            super::super::ModalKind::PluginManager => {
+                #[cfg(not(target_arch = "wasm32"))]
+                {
+                    sized(
+                        crate::ui::window::plugin_manager::view_window(
+                            &self.disabled_plugins,
+                            &self.external_plugins,
+                            &self.loaded_plugin_ids,
+                            crate::ui::window::plugin_manager::MarketView {
+                                registry: &self.plugin_registry,
+                                registry_loading: self.plugin_registry_loading,
+                                registry_error: self.plugin_registry_error.as_deref(),
+                                registry_error_details_open: self
+                                    .plugin_registry_error_details_open,
+                                input: &self.plugin_repo_input,
+                                search: &self.plugin_search_input,
+                                repos: &self.plugin_repos,
+                                release_tags: &self.repo_release_tags,
+                                selected_tag: &self.repo_selected_tag,
+                                selected_repo: self.selected_plugin_repo.as_deref(),
+                                readmes: &self.plugin_readmes,
+                                readme_loading: &self.plugin_readme_loading,
+                                status: &self.marketplace_status,
+                            },
+                            &self.active_theme,
+                        ),
+                        940,
+                        600,
+                    )
+                }
+                #[cfg(target_arch = "wasm32")]
+                {
+                    sized(
+                        crate::ui::window::plugin_manager::view_web_notice(),
+                        520,
+                        260,
+                    )
+                }
+            }
             super::super::ModalKind::UpdateNotice => {
                 let latest = self.update_notice_version.as_deref().unwrap_or("?");
                 let body = self.update_notice_body.as_deref().unwrap_or("");

src/ui/window/plugin_manager.rs

@@ -4,6 +4,8 @@
 //! launches). Dynamic loading still comes with the phase-2 loader; see
 //! `docs/plugin-architecture.md`.
 
+#![cfg_attr(target_arch = "wasm32", allow(dead_code))]
+
 use crate::app::Message;
 use crate::plugin::external::{ExternalPlugin, RegistryEntry};
 use iced::widget::{
@@ -33,9 +35,13 @@ pub struct MarketView<'a> {
     pub status: &'a str,
 }
 
-// External plugins are native dynamic libraries, so the browser build must not
-// advertise a manager it cannot use.
-#[cfg(not(target_arch = "wasm32"))]
+/// Latest desktop builds, used by the browser-only plugin notice.
+#[cfg(target_arch = "wasm32")]
+pub const DESKTOP_DOWNLOAD_URL: &str =
+    "https://github.com/HakanSeven12/OpenCADStudio/releases/latest";
+
+// Register the command names for autocomplete. On the web they open a desktop
+// download notice instead of the native marketplace.
 inventory::submit!(crate::command::CommandRegistration {
     names: &["PLUGINS", "PLUGINMANAGER"]
 });
@@ -844,6 +850,36 @@ pub fn view_window<'a>(
     .into()
 }
 
+/// Browser replacement for the native Plugin Manager.
+#[cfg(target_arch = "wasm32")]
+pub fn view_web_notice<'a>() -> Element<'a, Message> {
+    let download = button(text("Download desktop app").size(13))
+        .on_press(Message::OpenUrl(DESKTOP_DOWNLOAD_URL.to_string()))
+        .padding([8, 16])
+        .style(button::primary);
+
+    container(
+        column![
+            text("Plugins require the desktop app").size(20),
+            text(
+                "Open CAD Studio plugins are native packages and cannot run inside a browser. \
+                 Install the desktop app to browse, install, and use plugins.",
+            )
+            .size(13)
+            .style(muted_style),
+            Space::new().height(8),
+            download,
+        ]
+        .spacing(8)
+        .padding(24)
+        .width(Fill),
+    )
+    .center(Fill)
+    .width(Fill)
+    .height(Fill)
+    .into()
+}
+
 #[cfg(test)]
 mod tests {
     use super::{newest_update, registry_error_message, repository_display_name};