fix(doctests): raise launch_timeout for the nix run . UI tests

The tutorial doc-test went red on ubuntu with

  inspector not available on port 3768 after 120s

with `building '...-logos-standalone-app-1.0.0.drv'` as the last line of
the launch log: the app was still compiling when the clock ran out.

The runner pre-builds `nix run .` as `nix build .`, which is
packages.default — the UI plugin. But `nix run .` launches apps.default,
the standalone app, whose closure (logos-standalone-app plus the bundled
backend modules) is not covered by that warm build, so it compiles
during launch and is charged against the default 120s inspector wait.

Give the three `nix run` UI tests the same launch_timeout the
logos-wallet-module spec already uses for exactly this reason. Nothing
here is rendered into the generated Markdown.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tests/tutorial-cpp-ui-app.test.yaml

@@ -787,6 +787,10 @@ sections:
           setup:
             - "nix build 'github:logos-co/logos-qt-mcp{release}' -o result-mcp"
           qt_mcp: "result-mcp"
+          # `nix build .` (the runner's warm-up) builds the UI plugin, not
+          # `apps.default`'s standalone-app closure, so that still compiles
+          # during launch and can blow past the default 120s inspector wait.
+          launch_timeout: 900
           tests:
             - name: "App window opens with title"
               action: wait_for

tests/tutorial-qml-ui-app.test.yaml

@@ -378,6 +378,13 @@ sections:
           setup:
             - "nix build 'github:logos-co/logos-qt-mcp{release}' -o result-mcp"
           qt_mcp: "result-mcp"
+          # The runner pre-builds `nix build .` — that is `packages.default`
+          # (the UI plugin). But `nix run .` launches `apps.default`, the
+          # standalone app, whose closure (logos-standalone-app + the bundled
+          # backend modules) is NOT covered by that warm build, so it compiles
+          # during launch. On a cold cache that exceeds the default 120s
+          # inspector wait and the app never boots before we give up.
+          launch_timeout: 900
           tests:
             - name: "App window opens with title"
               action: wait_for
@@ -446,6 +453,9 @@ sections:
           setup:
             - "nix build 'github:logos-co/logos-qt-mcp{release}' -o result-mcp"
           qt_mcp: "result-mcp"
+          # Overriding calc_module rebuilds the standalone app closure, which
+          # the `nix build` warm-up does not cover — see the note in Step 5.
+          launch_timeout: 900
           tests:
             - name: "App title visible"
               action: wait_for