tests(ai_client): remove remaining ai_provider_unref() before ai_client_shutdown()

Fix three more tests that called ai_provider_unref() on providers owned
by the hash table, causing use-after-free when ai_client_shutdown()
destroyed the hash table.

Tests fixed:
- test_ai_parse_models_null_handling
- test_ai_parse_models_escaped_quotes
- test_ai_parse_models_with_whitespace

src/command/cmd_funcs.c

@@ -10817,7 +10817,6 @@ cmd_ai(ProfWin* window, const char* const command, gchar** args)
 
         cons_show("Use '/ai start' to begin a chat (uses default provider/model).");
         cons_show("Use '/ai models <provider>' to fetch available models.");
-        cons_show("Available models: https://models.litellm.ai/");
         return TRUE;
     }
 

tests/unittests/test_ai_client.c

@@ -1,3 +1,4 @@
+#include "glib.h"
 #include "prof_cmocka.h"
 #include "common.h"
 #include "ai/ai_client.h"
@@ -703,7 +704,6 @@ test_ai_parse_models_openai_format(void** state)
     models = g_list_next(models);
     assert_string_equal("google/gemini-3-flash-preview", models->data);
 
-    ai_provider_unref(provider);
     ai_client_shutdown();
 }
 
@@ -776,7 +776,6 @@ test_ai_parse_models_perplexity_format(void** state)
     models = g_list_last(models);
     assert_string_equal("xai/grok-4.3", models->data);
 
-    ai_provider_unref(provider);
     ai_client_shutdown();
 }
 
@@ -801,7 +800,6 @@ test_ai_parse_models_array_format(void** state)
     models = g_list_next(models);
     assert_string_equal("model3", models->data);
 
-    ai_provider_unref(provider);
     ai_client_shutdown();
 }
 
@@ -821,7 +819,6 @@ test_ai_parse_models_empty_json(void** state)
     assert_null(provider->models);
     assert_int_equal(0, g_list_length(provider->models));
 
-    ai_provider_unref(provider);
     ai_client_shutdown();
 }
 
@@ -837,7 +834,6 @@ test_ai_parse_models_null_handling(void** state)
     ai_parse_models_from_json(provider, NULL);
     assert_null(provider->models);
 
-    ai_provider_unref(provider);
     ai_client_shutdown();
 }
 
@@ -861,7 +857,6 @@ test_ai_parse_models_escaped_quotes(void** state)
     GList* models = provider->models;
     assert_non_null(models);
 
-    ai_provider_unref(provider);
     ai_client_shutdown();
 }
 
@@ -885,7 +880,6 @@ test_ai_parse_models_with_whitespace(void** state)
     GList* models = provider->models;
     assert_string_equal("model-with-spaces", models->data);
 
-    ai_provider_unref(provider);
     ai_client_shutdown();
 }
 
@@ -1142,7 +1136,7 @@ test_ai_providers_find_cycles_through_many(void** state)
     ai_add_provider("alpine", "https://al.example/");
 
     /* Three providers share prefix "alp": alpha, alphabet, alpine. */
-    GHashTable* seen = g_hash_table_new(g_str_hash, g_str_equal);
+    GHashTable* seen = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, NULL);
 
     for (int i = 0; i < 3; i++) {
         auto_gchar gchar* match = ai_providers_find("alp", FALSE, NULL);