CI: Manual SMB soak job in slow-checks workflow

Adds a `smb-soak` job gated on `workflow_dispatch` only — nightly is too
aggressive for a 30-min soak, on-demand is the right cadence. Starts the
Docker SMB core containers, runs `./scripts/soak-smb.sh 1800`, and stops
the containers on exit. Skipped on the scheduled nightly run.

Author: vdavid

.github/workflows/slow-checks.yml

@@ -94,3 +94,51 @@ jobs:
 
       - name: Run type-aware ESLint
         run: ./scripts/check/check --check desktop-svelte-eslint-typecheck --ci
+
+  # ===========================================
+  # SMB soak test (manual trigger only)
+  # ===========================================
+  # 30-minute repeated SMB→Local copy loop that watches for accumulating bugs
+  # (credit leaks, FD leaks, memory growth, per-iteration drift). Nightly is
+  # too aggressive for a soak this long; `workflow_dispatch` runs it on demand
+  # when we want the signal (pre-release, after SMB refactors, etc.).
+  smb-soak:
+    name: SMB soak (30 min)
+    runs-on: ubuntu-latest
+    if: github.event_name == 'workflow_dispatch'
+    timeout-minutes: 50
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
+
+      - name: Install mise
+        uses: jdx/mise-action@1648a7812b9aeae629881980618f079932869151 # v4
+
+      - name: Install tools with mise
+        run: mise install
+
+      - name: Cache Cargo
+        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4
+        with:
+          path: ~/.cargo/registry/cache
+          key: ${{ runner.os }}-cargo-${{ hashFiles('Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-
+
+      - name: Install Tauri dependencies (Linux)
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y libwebkit2gtk-4.1-dev libappindicator3-dev librsvg2-dev patchelf libacl1-dev
+
+      - name: Start Docker SMB containers
+        run: ./apps/desktop/test/smb-servers/start.sh core
+
+      - name: Run SMB soak (30 min)
+        run: ./scripts/soak-smb.sh 1800
+        env:
+          RUST_LOG: info
+
+      - name: Stop Docker SMB containers
+        if: always()
+        run: ./apps/desktop/test/smb-servers/stop.sh || true