chore: monorepo inicial con arje + minga + yahweh absorbidos

Workspace en 4 ejes (core/modules/apps/shared):

- core/: 24 crates de arje (Init systemd-compatible: ente-card, ente-zero,
  ente-kernel, ente-bus, ente-cas, ente-soma, ente-wasm, ente-snapshot,
  ente-brain, ente-echo, ente-policy-provider, + 12 crates *-compat)
- modules/semantic_dht/: 5 crates de minga (minga-core con AST/CAS/MST,
  minga-p2p con libp2p Kad, minga-store, minga-vfs, minga-cli)
- modules/ui_engine/: 11 crates de yahweh (libs/{core,theme,bus,providers},
  widgets/{tree,splitter,tabs,tiled,container_core,text_input})
- apps/: 5 crates de yahweh (file_explorer, database_explorer, text_viewer,
  image_viewer, yahweh-shell)
- shared_wit/protocol.wit: handshake/lifecycle inicial

Cargo.toml unificado: thiserror bumped a 2 (transparente para arje), tokio
"full", paths intra-workspace de yahweh redirigidos a su nueva ubicación.

cargo check --workspace: 0 errores, 17 warnings (dead code preexistente).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

crates/apps/image_viewer/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "yahweh-image-viewer"
+version = { workspace = true }
+edition = { workspace = true }
+license = { workspace = true }
+description = "Visor de imágenes. Suscribe al AppBus y renderea con gpui::img(path)."
+
+[dependencies]
+gpui = { workspace = true }
+yahweh-bus = { workspace = true }
+yahweh-theme = { workspace = true }

crates/apps/image_viewer/src/lib.rs

@@ -0,0 +1,148 @@
+//! `yahweh_image_viewer` — visor de imágenes.
+//!
+//! Suscribe al `AppBus` y, en cada `EntitySelected` cuyo provider sea
+//! `local_fs` y la extensión sugiera imagen (jpg, png, webp, gif), pasa el
+//! path a `gpui::img(...)` que se encarga del decode + cache. Para otros
+//! providers o extensiones desconocidas, muestra un mensaje neutro sin
+//! intentar render (evita binarios random pasando por el decoder).
+//!
+//! Detección por extensión: lista de extensiones soportadas en
+//! [`is_image_path`]. Para discriminar por mime real (sin importar la
+//! extensión) habría que invocar `image::guess_format` en un task —
+//! valdrá la pena cuando carguemos imágenes desde SQLite blobs.
+
+use std::path::Path;
+
+use gpui::{
+    Context, Entity, IntoElement, Render, SharedString, Window, div, img, prelude::*, px,
+};
+
+use yahweh_bus::{AppBus, AppEvent};
+use yahweh_theme::Theme;
+
+const FS_PROVIDER: &str = "local_fs";
+
+pub struct ImageViewer {
+    /// Path actualmente mostrado (si lo hay).
+    current_path: Option<String>,
+    /// Mensaje a mostrar cuando no se puede renderear (extensión no
+    /// reconocida, provider sin soporte, etc.).
+    notice: Option<SharedString>,
+}
+
+impl ImageViewer {
+    pub fn new(bus: Entity<AppBus>, cx: &mut Context<Self>) -> Self {
+        cx.observe_global::<Theme>(|_, cx| cx.notify()).detach();
+        cx.subscribe(&bus, |this: &mut ImageViewer, _, ev, cx| {
+            this.on_app_event(ev, cx);
+        })
+        .detach();
+        Self {
+            current_path: None,
+            notice: None,
+        }
+    }
+
+    fn on_app_event(&mut self, event: &AppEvent, cx: &mut Context<Self>) {
+        let (provider, id) = match event {
+            AppEvent::EntitySelected { provider, id, .. }
+            | AppEvent::EntityOpened { provider, id, .. } => (provider, id),
+        };
+
+        if provider != FS_PROVIDER {
+            self.current_path = None;
+            self.notice = Some(
+                format!("provider '{}' no soportado por ImageViewer", provider).into(),
+            );
+            cx.notify();
+            return;
+        }
+
+        if !is_image_path(id) {
+            self.current_path = None;
+            self.notice = Some("(no es una imagen reconocible)".into());
+            cx.notify();
+            return;
+        }
+
+        self.current_path = Some(id.clone());
+        self.notice = None;
+        cx.notify();
+    }
+}
+
+fn is_image_path(path: &str) -> bool {
+    let ext = Path::new(path)
+        .extension()
+        .and_then(|e| e.to_str())
+        .unwrap_or("")
+        .to_ascii_lowercase();
+    matches!(
+        ext.as_str(),
+        "png" | "jpg" | "jpeg" | "webp" | "gif" | "bmp" | "ico" | "tiff" | "tif"
+    )
+}
+
+impl Render for ImageViewer {
+    fn render(&mut self, _w: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
+        let theme = Theme::global(cx).clone();
+
+        let header_text = match (&self.current_path, &self.notice) {
+            (Some(p), _) => format!("[image] {}", p),
+            (None, Some(n)) => n.to_string(),
+            (None, None) => "(ninguna imagen seleccionada)".to_string(),
+        };
+
+        let body: gpui::AnyElement = match (&self.current_path, &self.notice) {
+            (Some(path), _) => {
+                let path_buf = std::path::PathBuf::from(path);
+                div()
+                    .flex_grow()
+                    .min_h(px(0.0))
+                    .flex()
+                    .items_center()
+                    .justify_center()
+                    .p(px(12.0))
+                    .child(img(path_buf).max_w_full().max_h_full())
+                    .into_any_element()
+            }
+            (None, Some(n)) => div()
+                .flex_grow()
+                .flex()
+                .items_center()
+                .justify_center()
+                .text_color(theme.fg_muted)
+                .text_size(px(11.0))
+                .child(n.clone())
+                .into_any_element(),
+            (None, None) => div()
+                .flex_grow()
+                .flex()
+                .items_center()
+                .justify_center()
+                .text_color(theme.fg_muted)
+                .text_size(px(11.0))
+                .child("doble click sobre una imagen en el FileExplorer.")
+                .into_any_element(),
+        };
+
+        div()
+            .size_full()
+            .bg(theme.bg_panel.clone())
+            .flex()
+            .flex_col()
+            .child(
+                div()
+                    .h(px(28.0))
+                    .px(px(10.0))
+                    .border_b_1()
+                    .border_color(theme.border)
+                    .flex()
+                    .items_center()
+                    .text_size(px(11.0))
+                    .text_color(theme.fg_muted)
+                    .child(SharedString::from(header_text)),
+            )
+            .child(body)
+    }
+}