Make filament manager notes searchable

[BenJule]

Summary

This PR makes filament manager notes searchable.

Why

The filament manager search currently matches brand, filament type, material series, and color name, but ignores the note field.

This makes it hard to find spools using user-provided labels such as storage location, project names, purchase notes, or custom descriptions.

Implementation

• Adds a small spoolSearchText() helper.
• Includes spool.note in the searchable text.
• Trims the search keyword before matching.
• Keeps the existing brand/type/series/color-name search behavior.

Test plan

• Add or edit a filament spool with a note.
• Search for a word that only appears in the note.
• Confirm the spool appears in the filtered list.
• Search for brand, filament type, material series, or color name and confirm existing behavior still works.

[BenJule]

Closing as duplicate of #11484, which already covers making filament manager notes searchable.

[BenJule]

Reopened this PR because #11484 was closed as the older duplicate. This PR contains the current clean implementation.

[lanewei120]

thanks @BenJule