Drop stray whitespace from sector and category names

[maebeale]

🤖 suggested review level: 3 Read 📖 one normalizes line on two models, with specs

Sector and category names now drop stray whitespace when saved, because a trailing space on prod's "Grief/Loss " quietly kept six tag aliases from ever matching it.

What is the goal of this PR and why is this important?

• Prod had 12 sectors saved with a trailing space (cleaned by hand on 2026-10-17).
• MySQL ignores trailing spaces when comparing, but Ruby lookups don't, so a stray space made a tag invisible to code matching names in Ruby.

How did you approach the change?

• normalizes :name squishes on Sector and Category, so every save path is covered.
• Existing rows change only when next saved; prod's known cases are already clean.

Anything else to add?

• The alias seeder also matches names whitespace-insensitively now (in Import people from the FileMaker Rolodex archive #2630).

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