Adding a delete confirmation for urls and video files

[TimRl]

1031-Adding a delete confirmation for urls and video files

#1031

Project: 1032-delete-video-safely

Summary

Removing or replacing a chapter video previously took effect with only a single, easily-dismissed native confirmation — risky because removing a local video permanently deletes the file from the project on save. This PR adds a robust "type-to-confirm" safety gate in the Edit Metadata modal: to remove a video, the user must type or paste the exact file name (local) or URL (remote) before the removal is enabled. It also removes the now-redundant second confirmation that fired afterward, so the user confirms exactly once.

Changes

These should match with the Acceptance Criteria

• Clicking Clear on a video in the Edit Metadata modal no longer removes it immediately; it opens a destructive confirmation panel.
• The user must type or paste the exact file name (local video) or URL (remote video) to enable the Remove video button; matching is exact (whitespace-trimmed) so a pasted value with stray spaces still works.
• The expected value is shown in a selectable/copyable field, with a "doesn't match yet" hint while typing a non-matching value.
• Confirming only empties the draft; the actual file deletion + metadata change still happens on Save Changes (and Cancel/X discards everything) — the existing deferred-save model is preserved.
• Keyboard support: Enter confirms when matched; Escape cancels just the confirmation without closing the modal; the input auto-focuses.
• The confirmation state resets when the modal opens, when the video reference changes (e.g. picking a new file), and on close.
• Removed the redundant host-side "Replace/Remove… will be deleted" prompt for modal-driven changes (a new skipVideoConfirm flag), since the modal now performs a stronger confirmation. The host still deletes the old file, and keeps the prompt as a fallback for any non-modal caller.

Testing Checklist

• Local file – remove: Clear a local video → confirmation panel appears showing the file name; Remove video is disabled until the typed/pasted name matches exactly.
• Typing a wrong/partial name keeps Remove video disabled and shows "The text doesn't match yet."
• Pasting the file name (with stray leading/trailing spaces) enables removal.
• URL – remove: Clear a URL video → must type/paste the full URL to enable removal.
• Confirm removal → field empties, but nothing is deleted until Save Changes.
• Save Changes after a confirmed local removal → the local file is actually deleted from files/ and pointers/; "Show Video" toggle disappears.
• Cancel/X after confirming removal (before Save) → video intact; local file not deleted; player still works.
• No redundant second native "Remove?/Replace?" dialog appears on Save after the in-modal confirmation.
• Replace flow: Clear (type-to-confirm) → pick a new file → no extra "Replace?" prompt; the old local file is deleted and the new one is saved.
• Esc inside the confirmation input cancels only the confirmation and does not close the modal.
• Enter in the input removes the video only when the text matches.
• Opening the modal / switching reference resets any in-progress confirmation (no stale panel).
• Regression: editing non-video fields (font size / direction / corpus marker) and saving still works with no video prompts.

[TimRl]

/build

[github-actions]

Pre-release: 0.27.0-pr1032-07e0bc6 https://github.com/genesis-ai-dev/codex-editor/releases/tag/0.27.0-pr1032-07e0bc6