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/tier1-orchestrator.md

@@ -1,7 +1,7 @@
----
+---
 description: Tier 1 Orchestrator for product alignment, high-level planning, and track initialization
 mode: primary
-model: MiniMax-M2.5
+model: minimax-coding-plan/MiniMax-M2.7
 temperature: 0.5
 permission:
   edit: ask
@@ -18,7 +18,7 @@ ONLY output the requested text. No pleasantries.
 
 ## Context Management
 
-**MANUAL COMPACTION ONLY** — Never rely on automatic context summarization.
+**MANUAL COMPACTION ONLY** <EFBFBD> Never rely on automatic context summarization.
 Use `/compact` command explicitly when context needs reduction.
 Preserve full context during track planning and spec creation.
 
@@ -105,7 +105,7 @@ Use `manual-slop_py_get_code_outline`, `manual-slop_py_get_definition`,
 Document existing implementations with file:line references in a
 "Current State Audit" section in the spec.
 
-**FAILURE TO AUDIT = TRACK FAILURE** — Previous tracks failed because specs
+**FAILURE TO AUDIT = TRACK FAILURE** <EFBFBD> Previous tracks failed because specs
 asked to implement features that already existed.
 
 ### 2. Identify Gaps, Not Features
@@ -175,4 +175,4 @@ Focus: {One-sentence scope}
 - 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.