fix: streaming scroll override, Gemini 3.x models, read-only workspace, two-container UID — v0.50.87 (closes #677 #669 #670 #668)

- #677: renderMessages() and appendThinking() use scrollIfPinned() during stream; scroll threshold 80→150px; floating ↓ scroll-to-bottom button added
- #669: Gemini 3.1 Pro Preview, 3 Flash Preview, 3.1 Flash Lite Preview added to all provider sections; gemini-3.1-flash-lite-preview was the missing ID causing API_KEY_INVALID; GEMINI_API_KEY env var detection added
- #670: docker_init.bash guards chown/write-test with [ -w ]; :ro workspace mounts no longer crash startup
- #668: UID/GID auto-detect probes /home/hermeswebui/.hermes and HERMES_HOME before /workspace; two-container Zeabur/Compose setups inherit correct UID automatically
- 18 new tests; 1441 total passing

tests/test_issues_373_374_375.py

@@ -230,3 +230,88 @@ class TestLiveModelFetching:
         assert live_route_pos > handle_get_pos, (
             "/api/models/live must be inside handle_get() (#375)"
         )
+
+
+# ── #669: Gemini model IDs must be valid for Google AI Studio endpoint ────────
+
+class TestGeminiModelIds:
+    """Gemini 3.x model IDs must be valid for the native Google AI Studio provider.
+
+    The original code had gemini-3.1-flash-lite-preview missing from the
+    dropdown. The fallback list also erroneously used gemini-3.1-pro-preview
+    in some provider sections while omitting gemini-3.1-flash-lite-preview.
+    All provider sections must now include the full current Gemini 3.x lineup.
+    """
+
+    VALID_GEMINI_3 = [
+        "gemini-3.1-pro-preview",
+        "gemini-3-flash-preview",
+        "gemini-3.1-flash-lite-preview",
+    ]
+
+    def test_gemini_provider_models_has_3x(self):
+        """_PROVIDER_MODELS['gemini'] must contain valid Gemini 3.x model IDs (#669)."""
+        gemini_block_start = CONFIG_PY.find('"gemini": [')
+        assert gemini_block_start != -1, "_PROVIDER_MODELS['gemini'] block not found"
+        gemini_block = CONFIG_PY[gemini_block_start:gemini_block_start + 600]
+        for mid in self.VALID_GEMINI_3:
+            assert mid in gemini_block, (
+                f"_PROVIDER_MODELS['gemini'] must contain {mid!r} — "
+                f"this is a valid Google AI Studio model ID (#669)"
+            )
+
+    def test_gemini_provider_models_has_flash_lite(self):
+        """_PROVIDER_MODELS['gemini'] must contain gemini-3.1-flash-lite-preview (#669).
+
+        This was the model the reporter selected from the wizard — it must appear
+        in the native gemini provider model list so users can select it.
+        """
+        gemini_block_start = CONFIG_PY.find('"gemini": [')
+        assert gemini_block_start != -1
+        gemini_block = CONFIG_PY[gemini_block_start:gemini_block_start + 600]
+        assert "gemini-3.1-flash-lite-preview" in gemini_block, (
+            "_PROVIDER_MODELS['gemini'] missing gemini-3.1-flash-lite-preview — "
+            "this was the exact model the #669 reporter tried and got API_KEY_INVALID"
+        )
+
+    def test_fallback_models_has_gemini_3x(self):
+        """_FALLBACK_MODELS must contain valid Gemini 3.x OpenRouter model IDs (#669)."""
+        fallback_start = CONFIG_PY.find("_FALLBACK_MODELS = [")
+        fallback_end = CONFIG_PY.find("]", fallback_start + len("_FALLBACK_MODELS = ["))
+        # Find the closing bracket for the list (multi-line)
+        depth = 0
+        pos = fallback_start + len("_FALLBACK_MODELS = [")
+        for i, ch in enumerate(CONFIG_PY[pos:], start=pos):
+            if ch == '[':
+                depth += 1
+            elif ch == ']':
+                if depth == 0:
+                    fallback_end = i
+                    break
+                depth -= 1
+        fallback_block = CONFIG_PY[fallback_start:fallback_end]
+        for mid in ("google/gemini-3.1-pro-preview", "google/gemini-3-flash-preview"):
+            assert mid in fallback_block, (
+                f"_FALLBACK_MODELS must contain {mid!r} for OpenRouter Google models (#669)"
+            )
+
+    def test_gemini_provider_also_has_stable_25(self):
+        """_PROVIDER_MODELS['gemini'] must retain stable Gemini 2.5 models (#669)."""
+        gemini_block_start = CONFIG_PY.find('"gemini": [')
+        assert gemini_block_start != -1
+        gemini_block = CONFIG_PY[gemini_block_start:gemini_block_start + 600]
+        assert "gemini-2.5-pro" in gemini_block, (
+            "_PROVIDER_MODELS['gemini'] must keep gemini-2.5-pro as a stable fallback"
+        )
+
+    def test_no_invalid_gemini_3_pro_model(self):
+        """gemini-3-pro-preview must not appear — it was shut down March 9 2026 (#669)."""
+        assert "gemini-3-pro-preview" not in CONFIG_PY or "gemini-3.1-pro-preview" in CONFIG_PY, (
+            "gemini-3-pro-preview was shut down — use gemini-3.1-pro-preview instead (#669)"
+        )
+        # More precise: ensure the bare (non-.1) version isn't the only one present
+        count_bare = CONFIG_PY.count('"gemini-3-pro-preview"')
+        assert count_bare == 0, (
+            f"gemini-3-pro-preview appears {count_bare} time(s) in config.py — "
+            "it was shut down March 9 2026, use gemini-3.1-pro-preview (#669)"
+        )