feat: add final result rendering with status badges and artifacts

- FinalResult component showing SubagentResult summary and artifacts
- Status badges: Success (green), Partial (amber), Failed (red)
- Quality and source badges (Verified/Inferred, Tool Output/Web/etc)
- Artifact list with file icons
- Integrated into chat page after stream completes

Closes #10

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

implementation-plans/issue-010.md

@@ -0,0 +1,18 @@
+---
+---
+
+# Issue #10: Final result rendering with artifacts
+
+**Status:** COMPLETED
+**Issue:** https://git.shahondin1624.de/llm-multiverse/llm-multiverse-ui/issues/10
+**Branch:** `feature/issue-10-final-result`
+
+## Acceptance Criteria
+
+- [x] summary field rendered as the main response content
+- [x] artifacts displayed as viewable items
+- [x] result_quality shown as a badge (Verified/Inferred/Uncertain)
+- [x] source shown as a badge (Tool Output/Model Knowledge/Web)
+- [x] FAILED status styled with error/red treatment
+- [x] PARTIAL status styled with warning/yellow treatment
+- [x] Successful results styled with success/green treatment