feat(sidebar): add unfolder and confirmed folder deletion

[moonrailgun]

Background

Folder deletion previously overlapped with stale-tab cleanup semantics. This change separates releasing tabs from destructive folder deletion and makes deletion confirmation apply consistently to every folder.

Changes

• Add a uniform folder context menu with Rename, Unfolder, and Delete Folder actions.
• Implement Unfolder to remove a folder while keeping child tabs open in place.
• Replace stale-only cleanup with a generic Delete Folder confirmation dialog that closes current child tabs before deleting the folder.
• Persist folder deletion only after confirmed child tabs actually close, preserving folders when closes are cancelled.
• Update localized strings, feature docs, checklist coverage, WebUI tests, and browser dialog coverage.

Testing

Patch includes updated WebUI tests for folder model, sidebar app, and tab list behavior, plus browser test coverage for the native delete-folder dialog.

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 9eed4ca and 58b352d.

📒 Files selected for processing (15)

• docs/feature-checklist.md
• docs/features.md
• src/dao/browser/strings/dao_strings.grd
• src/dao/browser/strings/translations/dao_strings_zh-CN.xtb
• src/dao/browser/ui/views/dao_browser_browsertest.cc
• src/dao/browser/ui/webui/dao_sidebar_ui.cc
• src/dao/browser/ui/webui/dao_sidebar_ui.h
• src/dao/browser/ui/webui/resources/sidebar/__tests__/folder_model.test.ts
• src/dao/browser/ui/webui/resources/sidebar/__tests__/sidebar_app.test.ts
• src/dao/browser/ui/webui/resources/sidebar/__tests__/tab_list.test.ts
• src/dao/browser/ui/webui/resources/sidebar/dao_folder_model.ts
• src/dao/browser/ui/webui/resources/sidebar/dao_sidebar_app.ts
• src/dao/browser/ui/webui/resources/sidebar/dao_tab_list.ts
• src/dao/browser/ui/webui/resources/sidebar/sidebar_bridge.ts
• src/patches/ui/views/widget/widget_delegate.h.patch

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