Wire IPC/settings/UI for RAG, runtime, download, and usage features; CI + deps

main.ts/preload.ts/electron.d.ts/settings-store.ts: IPC handlers and settings fields for everything above. Settings.tsx/Chat.tsx: RAG collections + citations UI, model runtime picker, embedding model picker. package.json: better-sqlite3 + other new deps. CI/release workflows and .gitignore updated for the new native builds (Rust lib, Python ml/) and build artifacts.

Author: voidstackloop

.github/workflows/ci.yml

@@ -16,6 +16,32 @@ jobs:
         with:
           node-version: 22
 
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt, clippy
+
+      - uses: Swatinem/rust-cache@v2
+        with:
+          workspaces: "lib -> target"
+
+      - name: Test native addon (Rust)
+        working-directory: lib
+        run: cargo test
+
+      - name: Check Rust formatting
+        working-directory: lib
+        run: cargo fmt --all -- --check
+
+      - name: Lint native addon (Rust)
+        working-directory: lib
+        run: cargo clippy --all-targets -- -D warnings
+
+      - name: Build native addon
+        working-directory: lib
+        run: |
+          npm ci
+          npm run build
+
       - name: Install frontend dependencies
         working-directory: frontend
         run: npm ci

.github/workflows/release.yml

@@ -24,6 +24,12 @@ jobs:
         with:
           node-version: 22
 
+      - uses: dtolnay/rust-toolchain@stable
+
+      - uses: Swatinem/rust-cache@v2
+        with:
+          workspaces: "lib -> target"
+
       - name: Install frontend dependencies
         working-directory: frontend
         run: npm ci

.gitignore

@@ -1,4 +1,6 @@
 *node_modules/
 app/dist/
 app/release/
+app/native/
 frontend/dist/
+lib/target/