feat: check OLLAMA_HOST reachability before starting translationv1.6

Non-blocking QThread check hits /api/tags on the resolved ollama host
before launching TranslationWorker. Shows QMessageBox.warning() if
unreachable; proceeds silently if reachable. Adds ollama_host field to
Config with env-var fallback to http://localhost:11434.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2 files changed, 38 insertions, 0 deletions

diff --git a/tests/test_config.py b/tests/test_config.py
index f19bfdd..f46a224 100644
--- a/tests/test_config.py
+++ b/tests/test_config.py
@@ -23,3 +23,30 @@ def test_config_is_complete_false_when_blog_repo_empty(tmp_path):
 def test_config_is_complete_true_when_all_set():
     cfg = Config(blog_repo="/some/repo", transart_script="/bin/x", typora_bin="typora")
     assert cfg.is_complete() is True
+
+def test_config_ollama_host_default(tmp_path):
+    path = tmp_path / "config.toml"
+    cfg = Config.load(path)
+    assert cfg.ollama_host == ""
+
+def test_config_ollama_host_round_trips(tmp_path):
+    path = tmp_path / "config.toml"
+    cfg = Config(blog_repo="/repo", ollama_host="http://1.2.3.4:11434")
+    cfg.save(path)
+    loaded = Config.load(path)
+    assert loaded.ollama_host == "http://1.2.3.4:11434"
+
+def test_resolved_ollama_host_uses_env_when_field_empty(monkeypatch):
+    monkeypatch.setenv("OLLAMA_HOST", "http://env-host:11434")
+    cfg = Config(ollama_host="")
+    assert cfg.resolved_ollama_host() == "http://env-host:11434"
+
+def test_resolved_ollama_host_prefers_field_over_env(monkeypatch):
+    monkeypatch.setenv("OLLAMA_HOST", "http://env-host:11434")
+    cfg = Config(ollama_host="http://config-host:11434")
+    assert cfg.resolved_ollama_host() == "http://config-host:11434"
+
+def test_resolved_ollama_host_fallback_default(monkeypatch):
+    monkeypatch.delenv("OLLAMA_HOST", raising=False)
+    cfg = Config(ollama_host="")
+    assert cfg.resolved_ollama_host() == "http://localhost:11434"
diff --git a/tests/test_ollama_check_worker.py b/tests/test_ollama_check_worker.py
new file mode 100644
index 0000000..3c575db
--- /dev/null
+++ b/tests/test_ollama_check_worker.py
@@ -0,0 +1,11 @@
+from workers.ollama_check_worker import OllamaCheckWorker
+
+
+def test_worker_appends_api_tags_path():
+    w = OllamaCheckWorker("http://localhost:11434")
+    assert w._url == "http://localhost:11434/api/tags"
+
+
+def test_worker_strips_trailing_slash():
+    w = OllamaCheckWorker("http://localhost:11434/")
+    assert w._url == "http://localhost:11434/api/tags"