fix(theme): prevent freeze when switching to system theme

[bajrangCoder]

No description provided.

[greptile-apps]

Greptile Summary

This PR prevents synchronous recursion when switching to the system theme while retaining immediate refreshes and subsequent operating-system theme synchronization.

• Refreshes the mutable system preset before applying it.
• Adds an applyTheme flag so watcher initialization can update the preset without recursively applying it.
• Preserves full theme application for later device dark-mode changes.

Confidence Score: 5/5

The PR appears safe to merge, with the recursion removed while system-theme rendering and operating-system change tracking remain intact.

The outer system-theme application renders the refreshed shared preset, watcher initialization no longer re-enters application, and later media-query changes still perform a full update.

Important Files Changed

Filename	Overview
src/theme/list.js	Refreshes the system preset before rendering and suppresses recursive application during watcher initialization without disrupting later media-query events.
src/theme/preInstalled.js	Adds an applyTheme control that separates system-preset mutation from optional immediate application and editor-theme persistence.

Sequence Diagram

sequenceDiagram
    participant User
    participant Apply as apply("system")
    participant System as updateSystemTheme
    participant Settings
    participant Watcher as updateSystemThemeWatcher
    User->>Apply: Select system theme
    Apply->>System: "Refresh preset (applyTheme=false)"
    System-->>Apply: Updated colors and editor preference
    Apply->>Apply: Render refreshed preset
    Apply->>Settings: "Persist appTheme="system""
    Settings->>Watcher: update:appTheme
    Watcher->>System: "Sync OS state (applyTheme=false)"
    Note over Watcher,System: No recursive apply

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