feat(ui): Implement conditional performance profiling for key GUI components

conductor/tracks/gui_performance_profiling_20260307/plan.md

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+# Implementation Plan: GUI Performance Profiling & Optimization (gui_performance_profiling_20260307)
+
+> **Reference:** [Spec](./spec.md) | [Architecture Guide](../../../docs/guide_architecture.md)
+
+## Phase 1: Instrumentation
+Focus: Add profiling hooks to gui_2.py
+
+- [x] Task 1.1: Wrap `_render_log_management` with profiling calls. (f27b971)
+- [x] Task 1.2: Wrap `_render_discussion_panel` with profiling calls. (f27b971)
+- [x] Task 1.3: Wrap `_render_mma_dashboard` with profiling calls. (f27b971)
+- [x] Task 1.4: Wrap core `_gui_func` logic with profiling calls. (f27b971)
+
+## Phase 2: Diagnostics UI
+Focus: Display timings in the GUI
+
+- [x] Task 2.1: Add "Detailed Component Timings" table to Diagnostics panel in `src/gui_2.py`. (f27b971)
+- [x] Task 2.2: Implement 10ms threshold highlighting in the table. (f27b971)
+
+## Phase 3: Verification & Optimization
+Focus: Analyze results and fix bottlenecks
+
+- [ ] Task 3.1: Verify timings are accurate via manual walkthrough.
+- [ ] Task 3.2: Identify components consistently > 10ms and propose optimizations.