fix: solve #1935 — browser panes no longer refresh on tab switch

[github-actions]

Root cause

TabsContent previously rendered only the active tab's <TabView>. Switching tabs unmounted the inactive TabView → BrowserPane unmounted → usePersistentWebview cleanup moved the <webview> element to an off-screen container (document.body child at left: -9999px).

In Electron, moving a <webview> element between DOM parents destroys and recreates its underlying renderer process — causing a full page reload and losing all in-page state (logged-in sessions, unsaved form data, dev-tool state, etc.).

The fix

TabsContent now renders all workspace tabs simultaneously. CSS (display: none) controls which tab is visible; the active tab wrapper gets display: flex, all others get display: none.

Because BrowserPane stays mounted for every tab, the <webview> element never moves between DOM parents on a tab switch. No reparenting → no renderer process restart → no page reload.

The usePersistentWebview hidden-container logic still runs correctly when a pane is destroyed (via destroyPersistentWebview) — that path is unaffected.

Changes

• TabsContent/index.tsx — render all workspace tabs; CSS controls visibility
• TabsContent/utils.ts — getWorkspaceTabsToRender helper (pure function)
• TabsContent/TabsContent.test.ts — regression test verifying all workspace tabs are included in the render set

Tests

bun test apps/desktop/src/renderer/screens/main/components/WorkspaceView/ContentView/TabsContent/TabsContent.test.ts
# 3 pass, 0 fail

Closes #1935

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Summary by cubic

Keep all workspace tab views mounted and toggle visibility with CSS so switching tabs no longer reloads Electron webviews, preserving in-page state (closes #1935).

• Bug Fixes
  • Render all workspace tabs at once; only the active tab is visible (display: flex vs display: none).
  • Prevent webview reparenting that restarted the renderer and caused page reloads.
  • Add getWorkspaceTabsToRender helper and a regression test to ensure all workspace tabs are rendered.

^{Written for commit bbd514a. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 3 files