codeant-ai-for-open-source[bot] commented on PR #38644:
URL: https://github.com/apache/superset/pull/38644#issuecomment-4059721220
## **Sequence Diagram**
This PR adds an explicit initial mode for theme initialization so embedded
dashboards start in light mode instead of inheriting OS preference. It
preserves later SDK-driven theme changes after the first render.
```mermaid
sequenceDiagram
participant EmbeddedApp
participant ThemeController
participant ThemeStorage
participant SDK
EmbeddedApp->>ThemeController: Initialize with initial mode default
ThemeController->>ThemeStorage: Read saved theme mode
ThemeStorage-->>ThemeController: No saved mode
ThemeController->>ThemeController: Use initial mode as startup fallback
ThemeController-->>EmbeddedApp: Apply light theme on first render
SDK->>ThemeController: Set theme mode dark or system
ThemeController-->>EmbeddedApp: Apply requested mode after init
```
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