[callumalpass]

Summary

Rebuilds the task create and edit modals around a shared form model and save path, and reworks their layout.

Create modal

• Natural-language input now updates the fields as you type. The wand button, preview and fallback textarea are removed.
• If a task saves but a follow-up step fails, a specific notice says so.

Edit modal

• The title is at the top, and Task information is a collapsed section.
• Due and Scheduled moved from Task information to the chips (the [FR]: Show current Due/Scheduled dates in Edit modal #2048 dates are now shown there).
• Archive and Delete moved to a ⋯ menu.

Both modals

• The icon row is now labelled chips showing current values, on desktop and mobile.
• Double submits can't save twice, invalid fields show inline errors, and the unsaved-changes prompt behaves the same in both.

Code

• New src/modals/taskFormModel.ts and src/modals/taskModalSave.ts. Inheritance between the modals is kept.
• Dead CSS removed. Public hook classes are kept so existing snippets still work.
• EmbeddableMarkdownEditor always pops its scope on blur.

Testing

• npm test, lint and typecheck pass.
• Modal e2e specs pass locally, including the new e2e/task-modal.spec.ts.
• Not run locally: the full e2e suite, lingui-bundled, language-packs, docs-screenshots, release-gifs.
• Checked by hand on a desktop and phone-layout Obsidian instance.

Known gaps

• The docs screenshot feature-task-modal-filled.png still shows the old modal.