Fix local folder picker cancel error and heading redundancy

[builder-io-integration]

Summary

Fixes two UX issues in the Local files settings page: a raw browser error shown when the user cancels the folder picker, and a redundant "Local files"/"Local folders" heading pair.

Problem

When a user opened the native folder picker (showDirectoryPicker) and backed out, the raw DOMException message ("Failed to execute 'showDirectoryPicker' on 'Window': The user aborted a request.") was surfaced as an error banner, which is confusing and non-user-friendly since cancelling isn't actually a failure. Additionally, the page heading "Local files" was immediately followed by a section heading "Local folders", which read as redundant/duplicated copy.

Solution

Added a helper to detect user-cancellation of the native folder picker (via AbortError name or ABORT_ERR code) and used it to suppress the error state in that case, while still surfacing real failures (e.g. permission denied). Also renamed the "Local folders" heading to "Folders" across locales to remove the redundancy with the "Local files" page title.

Key Changes

• Added isUserCancelledFolderPickerError in local-folder-picker-safety.ts to identify AbortError/ABORT_ERR from showDirectoryPicker() rejections, distinct from other errors.
• Updated _app.local-files.tsx to check isUserCancelledFolderPickerError in the catch block and return early (no error state) when the user simply cancelled the picker.
• Added unit tests covering: recognizing AbortError DOMExceptions, recognizing abort by error code when name is unavailable, and rejecting real failures (NotAllowedError, generic Error, null, non-object values).
• Updated the localFolders i18n string from "Local folders" to "Folders" (and localized equivalents in zh-TW, zh-CN, and es) to resolve the heading redundancy.

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Fixes feedback from Slack thread #an-factory-test-5 (Factory item edd61ff12be975b12c1a5db93fc07836217ba6118be111724e916cdc435a4f0a).
Source: https://slack.com/app_redirect?team=T0GCV21GE&channel=C0BUK2293SA&message_ts=1788463870.010759

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To clone this PR locally use the Github CLI with command gh pr checkout 4563

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[steve8708]

@builderio-bot look at the latest PR feedback and fix anything you agree with. Be skeptical. Reply on each comment thread whether you fixed it and why. Get CI green and keep the branch mergeable.

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[builder-io-integration]

Reviewed the latest PR feedback:

• Automated code review (builder-io-integration bot): reported "No confirmed issues found" — agreed, nothing to change there. It also noted it couldn't run browser automation; I already verified the fix locally via the added unit tests (isUserCancelledFolderPickerError covering the cancel/abort-code/non-cancellation cases) plus the existing local-files layout tests, all passing.
• CI: all required checks are green (lint, typecheck, tests, build, security guards).
• Merged latest main into this branch to pick up unrelated fixes and keep it mergeable/up to date; re-ran the targeted test suites afterward and confirmed my changes are intact and passing.

The PR shows mergeStateStatus: BLOCKED only because it's awaiting a required human review approval — no outstanding code/CI issue on my end.

[builder-io-integration]

I checked PR #4563's feedback:

• The only automated review (builder-io-integration bot) reported "No confirmed issues found" — I agree, nothing to fix there.
• All CI checks are green (lint, typecheck, tests, build, security guards).
• No inline review comments exist on the PR.
• Merged latest main into the branch to keep it current, re-ran the targeted tests, and confirmed my changes are intact and passing.

The PR is mergeable: MERGEABLE but mergeStateStatus: BLOCKED solely because it's waiting on a required human review approval — that's not a code or CI issue I can resolve. I posted a summary reply on the PR thread explaining this.

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⠀
🟢 No actionable PR feedback to fix; CI green, branch up to date and mergeable, pending required review approval.

[builder-io-integration]

Builder reviewed your changes — looks good ✅

Review Details

Incremental Code Review Summary

I re-reviewed the latest PR #4563 head. The current diff remains a narrowly scoped Content UI repair: it suppresses the folder-add error only for native picker cancellation (AbortError/ABORT_ERR), preserves real failure reporting, and renames the redundant folders heading across the configured locale entries.

Two independent incremental review passes found no new confirmed issues. The helper’s object-shape checks and the route’s early return remain compatible with the existing cleanup/finally behavior, and the added regression suite passes 6/6 tests. No previous review comments were open, so there were no resolved threads to update.

Findings

No new confirmed issues found.

🧪 Browser testing: Attempted — the dev server was healthy, but the browser-test planner and executors had no Chrome automation tools registered. All planned UI cases were reported as unable to verify due to that environment-wide tooling blocker.