feat: tutorial — glaze & glaze fire workflow

[shaoster]

Problem / Motivation

The glazing-to-glaze-fire portion of the workflow involves selecting glaze combinations and navigating optional states (waxed, sanded) that are easy to miss. New users need guidance on what to record and when.

Proposed Solution

Implement the "Glaze & glaze fire workflow" tutorial using TutorialOverlay. Tutorial slug: glaze_fire. Fires after bisque_fire is dismissed.

Steps:

1. Spotlight optional waxed transition. Copy: "If you waxed the foot ring, record it here."
2. Spotlight glazed transition and glaze combination field. Copy: "Select or create a glaze combination — this links your piece to your glaze recipes."
3. Spotlight submitted_to_glaze_fire transition. Copy: "Load the kiln and submit to glaze fire."
4. Spotlight glaze_fired transition and cone field. Copy: "After firing, mark glaze fired and record the cone."
5. Spotlight optional sanded transition. Copy: "Optionally record any post-fire sanding."
6. Completion card with Dismiss.

Acceptance Criteria

• Tutorial fires after bisque_fire is dismissed and glaze_fire is not yet dismissed.
• Each step spotlights the correct element with the specified copy.
• Dismiss marks glaze_fire via the user settings API.
• Uses TutorialOverlay.
• Covered by unit tests.

Dependencies

• Blocked by overlay shell issue (TutorialOverlay component).
• Blocked by feat: add per-tutorial dismissed/seen flags to user settings #453 (dismissed/seen flags API).