fix(webview): respect system color scheme for prefers-color-scheme in web blocks

[Jason-Shen2]

Fixes#3318

Changes nativeTheme.themeSource from 'dark' to 'system' so that embedded web content (web blocks) correctly respects the OS color scheme preference. Wave's own UI remains dark-themed via CSS color-scheme: dark and custom scrollbar styling, so this only affects webview/iframe content.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 9dc4bc75-abcf-4072-893f-2fbafd9a5d24

📥 Commits

Reviewing files that changed from the base of the PR and between c99022c and ab72ccb.

📒 Files selected for processing (1)

• emain/emain.ts

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Walkthrough

This change modifies a single configuration line in the Electron main process file, updating the native theme source setting from a hardcoded "dark" value to "system", causing the application to follow the operating system's theme preference.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Changes

File	Change Summary
emain/emain.ts	Changed `electron.nativeTheme.themeSource` from `"dark"` to `"system"`

Related issues: None specified.

Related PRs: None specified.

Suggested labels: None

Suggested reviewers: None

Poem
A rabbit hops from dark to light,
No more forced shadows, day or night,
The system now decides the hue,
One line changed, the theme rings true,
Hop, hop, hooray — the OS knows best! 🐇🌗

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the webview color-scheme fix and matches the main change.
Description check	✅ Passed	The description directly explains the themeSource change and its effect on embedded web content.
Linked Issues check	✅ Passed	The change matches #3318 by switching embedded web content from forced dark to system color scheme.
Out of Scope Changes check	✅ Passed	No unrelated changes are introduced; the PR is a single targeted themeSource adjustment.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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