fix: Display correct provider icons for all OpenCode/Bedrock models

The issue was that ALL OpenCode models were showing the OpenCode icon, regardless
of their actual underlying provider. This fix ensures each model shows its
authentic brand icon.

Changes:

1. **model-constants.ts** - Fixed provider field assignment
   - Changed provider from hardcoded 'opencode' to actual config.provider
   - Now correctly maps: opencode/big-pickle, amazon-bedrock/anthropic.*, etc.

2. **phase-model-selector.tsx** - Added provider-specific icon logic
   - Added imports for DeepSeekIcon, NovaIcon, QwenIcon, MistralIcon, MetaIcon
   - Added ProviderIcon selector based on model.provider field
   - Each model type now displays its correct provider icon

3. **provider-icon.tsx** - Updated icon detection and mapping
   - Enhanced getUnderlyingModelIcon() to detect specific Bedrock providers:
     * amazon-bedrock/anthropic.* → anthropic icon
     * amazon-bedrock/deepseek.* → deepseek icon
     * amazon-bedrock/nova.* → nova icon
     * amazon-bedrock/meta.* or llama → meta icon
     * amazon-bedrock/mistral.* → mistral icon
     * amazon-bedrock/qwen.* → qwen icon
     * opencode/* → opencode icon
   - Added meta and mistral to PROVIDER_ICON_KEYS
   - Added placeholder definitions for meta/mistral in PROVIDER_ICON_DEFINITIONS
   - Updated iconMap to include all provider icons
   - Set OpenCode icon to official brand color (#6366F1 indigo)

Result: All model selectors and kanban cards now show correct brand icons
for each OpenCode model (DeepSeek whale, Amazon Nova sparkle, Qwen star, etc.)

apps/ui/src/components/views/settings-view/model-defaults/phase-model-selector.tsx

@@ -27,7 +27,17 @@ import {
   REASONING_EFFORT_LABELS,
 } from '@/components/views/board-view/shared/model-constants';
 import { Check, ChevronsUpDown, Star, ChevronRight } from 'lucide-react';
-import { AnthropicIcon, CursorIcon, OpenAIIcon, OpenCodeIcon } from '@/components/ui/provider-icon';
+import {
+  AnthropicIcon,
+  CursorIcon,
+  OpenAIIcon,
+  OpenCodeIcon,
+  DeepSeekIcon,
+  NovaIcon,
+  QwenIcon,
+  MistralIcon,
+  MetaIcon,
+} from '@/components/ui/provider-icon';
 import { Button } from '@/components/ui/button';
 import {
   Command,
@@ -503,6 +513,28 @@ export function PhaseModelSelector({
     const isSelected = selectedModel === model.id;
     const isFavorite = favoriteModels.includes(model.id);
 
+    // Get the appropriate icon based on provider
+    const ProviderIcon = (() => {
+      switch (model.provider) {
+        case 'opencode':
+          return OpenCodeIcon;
+        case 'amazon-bedrock-anthropic':
+          return AnthropicIcon;
+        case 'amazon-bedrock-deepseek':
+          return DeepSeekIcon;
+        case 'amazon-bedrock-amazon':
+          return NovaIcon;
+        case 'amazon-bedrock-meta':
+          return MetaIcon;
+        case 'amazon-bedrock-mistral':
+          return MistralIcon;
+        case 'amazon-bedrock-qwen':
+          return QwenIcon;
+        default:
+          return OpenCodeIcon;
+      }
+    })();
+
     return (
       <CommandItem
         key={model.id}
@@ -514,7 +546,7 @@ export function PhaseModelSelector({
         className="group flex items-center justify-between py-2"
       >
         <div className="flex items-center gap-3 overflow-hidden">
-          <OpenCodeIcon
+          <ProviderIcon
             className={cn(
               'h-4 w-4 shrink-0',
               isSelected ? 'text-primary' : 'text-muted-foreground'