fix(gui): Skip empty strings in selectable to prevent ImGui ID assertion

Empty strings in bias_profiles.keys() and personas.keys() caused
imgui.selectable() to fail with 'Cannot have an empty ID at root of
window' assertion error. Added guards to skip empty names.

.opencode/agents/tier2-tech-lead.md

@@ -1,7 +1,7 @@
----
+---
 description: Tier 2 Tech Lead for architectural design and track execution with persistent memory
 mode: primary
-model: MiniMax-M2.5
+model: minimax-coding-plan/MiniMax-M2.7
 temperature: 0.4
 permission:
   edit: ask
@@ -14,9 +14,9 @@ ONLY output the requested text. No pleasantries.
 
 ## Context Management
 
-**MANUAL COMPACTION ONLY** — Never rely on automatic context summarization.
+**MANUAL COMPACTION ONLY** � Never rely on automatic context summarization.
 Use `/compact` command explicitly when context needs reduction.
-You maintain PERSISTENT MEMORY throughout track execution — do NOT apply Context Amnesia to your own session.
+You maintain PERSISTENT MEMORY throughout track execution � do NOT apply Context Amnesia to your own session.
 
 ## CRITICAL: MCP Tools Only (Native Tools Banned)
 
@@ -134,14 +134,14 @@ Before implementing:
 - Zero-assertion ban: Tests MUST have meaningful assertions
 - Delegate test creation to Tier 3 Worker via Task tool
 - Run tests and confirm they FAIL as expected
-- **CONFIRM FAILURE** — this is the Red phase
+- **CONFIRM FAILURE** � this is the Red phase
 
 ### 3. Green Phase: Implement to Pass
 
 - **Pre-delegation checkpoint**: Stage current progress (`git add .`)
 - Delegate implementation to Tier 3 Worker via Task tool
 - Run tests and confirm they PASS
-- **CONFIRM PASS** — this is the Green phase
+- **CONFIRM PASS** � this is the Green phase
 
 ### 4. Refactor Phase (Optional)
 
@@ -213,4 +213,4 @@ When all tasks in a phase are complete:
 - Do NOT use native `edit` tool - use MCP tools
 - DO NOT SKIP A TEST IN PYTEST JUST BECAUSE ITS BROKEN AND HAS NO TRIVIAL SOLUTION OR FIX.
 - DO NOT SIMPLIFY A TEST JUST BECAUSE IT HAS NO TRIVIAL SOLUTION TO FIX.
-- DO NOT CREATE MOCK PATCHES TO PSEUDO API CALLS OR HOOKS BECAUSE THE APP SOURCE WAS CHANGED. ADAPT TESTS PROPERLY.
+- DO NOT CREATE MOCK PATCHES TO PSEUDO API CALLS OR HOOKS BECAUSE THE APP SOURCE WAS CHANGED. ADAPT TESTS PROPERLY.