feat: Add indexing group to CodexLens environment variable schema

- Introduced a new `indexing` group in the environment variable schema with fields for AST grep usage, static graph enablement, and relationship types.
- Updated the CodexLens configuration to support new indexing features.

feat: Enhance DashboardToolbar with session and fullscreen controls

- Added props for session sidebar visibility and fullscreen mode to the DashboardToolbar component.
- Implemented handlers for toggling session sidebar and fullscreen mode.
- Updated the toolbar layout to include session sidebar toggle and fullscreen button.

refactor: Improve TerminalGrid and TerminalPane components

- Refactored GridGroupRenderer to handle pane size changes directly via store.
- Enhanced TerminalPane to remove unused file browser logic and improve layout handling.
- Updated key generation for child panes to ensure stability.

feat: Extend CodexLens API for staged Stage-2 expansion modes

- Added support for `staged_stage2_mode` in the CodexLens API, allowing for different expansion strategies.
- Updated semantic search handlers to process new stage-2 mode parameter.
- Implemented validation and handling for new stage-2 modes in the backend.

test: Add benchmarks for staged Stage-2 modes comparison

- Created a benchmark script to compare performance and results of different staged Stage-2 modes.
- Included metrics for latency, overlap, and diversity across modes.

codex-lens/tests/api/test_semantic_search.py

@@ -32,6 +32,7 @@ class TestSemanticSearchFunctionSignature:
             "structural_weight",
             "keyword_weight",
             "fusion_strategy",
+            "staged_stage2_mode",
             "kind_filter",
             "limit",
             "include_match_reason",
@@ -49,6 +50,7 @@ class TestSemanticSearchFunctionSignature:
         assert sig.parameters["structural_weight"].default == 0.3
         assert sig.parameters["keyword_weight"].default == 0.2
         assert sig.parameters["fusion_strategy"].default == "rrf"
+        assert sig.parameters["staged_stage2_mode"].default is None
         assert sig.parameters["kind_filter"].default is None
         assert sig.parameters["limit"].default == 20
         assert sig.parameters["include_match_reason"].default is False