fix(personalization): fix treeland theme switching logic

[mhduiy]

当控制中心设置为自动时，系统深浅色会动态变更。之前直接把treeland的实际深浅色
属性设置到model中，会导致控制中心选项中的"自动"显示为"深色"或"浅色"，
这不符合预期。

现在改用 dde-appearance 保存的 GlobalTheme 属性作为控制中心深浅色的数据来源， 该数据在自动模式下保持不变，正确显示为"自动"。

pms: BUG-346357

Summary by Sourcery

Bug Fixes:

• Prevent the control center theme option from incorrectly showing Light or Dark when system theme is set to Auto by decoupling it from Treeland's dynamically changing actual theme state.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Removes direct updates of the model’s current appearance based on Treeland’s actual light/dark theme, and instead relies on dde-appearance’s GlobalTheme as the single source of truth for control center theme state to keep the 'Auto' option stable.

File-Level Changes

Change	Details	Files
Stop mapping Treeland’s effective light/dark theme directly into the model and document the new behavior of using GlobalTheme as the data source for control center theme state.	Removed the switch statement that set model currentAppearance to .light/.dark/"" based on theme_type values Left the windowThemeTypeChanged(themeType) signal emission intact so Treeland updates still propagate Added detailed comments explaining why Treeland’s effective theme is no longer written into the model and that dde-appearance GlobalTheme should be used instead	src/plugin-personalization/operation/treelandworker.cpp

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[sourcery-ai]

Hey - I've found 1 issue, and left some high level feedback:

• If m_model->setCurrentAppearance(...) is no longer used as a result of this change, consider removing the now-unused method and related state to avoid confusion and dead code.
• Given that the model no longer reacts to themeType here, double-check whether any UI elements still depend on this signal-to-model linkage and, if not, clean up any remaining references to currentAppearance in the model to keep responsibilities clear.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- If `m_model->setCurrentAppearance(...)` is no longer used as a result of this change, consider removing the now-unused method and related state to avoid confusion and dead code.
- Given that the model no longer reacts to `themeType` here, double-check whether any UI elements still depend on this signal-to-model linkage and, if not, clean up any remaining references to `currentAppearance` in the model to keep responsibilities clear.

## Individual Comments

### Comment 1
<location path="src/plugin-personalization/operation/treelandworker.cpp" line_range="632-634" />
<code_context>
-        m_model->setCurrentAppearance("");
-        break;
-    }
+    // 设置给Treeland的深浅色属性是系统实际生效的深浅色，当控制中心设置为自动时，此时系统的深浅色会动态的变更
+    // 如果直接把treeland的属性设置到model中，会导致控制中心选项中的自动显示为深色或者浅色，这不符合预期。
+    // 现在使用 dde-appearance 保存的GlobalTheme属性来作为控制中心深浅色的数据来源，该数据在自动时数据保持不变
 }

</code_context>
<issue_to_address>
**issue:** Comment describes behavior that is not reflected in this function’s implementation.

This comment describes behavior (using dde-appearance’s GlobalTheme as the source of truth in auto mode) that this function no longer implements—it only emits a signal. If that logic now lives elsewhere, this comment should be updated or removed so it reflects what this function actually does, and the higher-level behavior documented where it is implemented instead.
</issue_to_address>

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: mhduiy, robertkill

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[mhduiy]

/forcemerge

[deepin-bot]

This pr force merged! (status: blocked)