Add left/right/both breast selection to pumping sessions

[mike12806]

Pumping entries can now record which breast the session was for: Left, Right, or Both.

Database

• New migration 0009_add_pumping_side.sql adds a nullable side TEXT CHECK(side IN ('left', 'right', 'both')) column to pumping. Existing entries keep a NULL side and render as —, so nothing needs backfilling.
• server/test/helpers.ts picks up the new migration so the test schema stays in sync.
• Seed data now sets a mix of sides.

API

• side added to the pumping route's column list, so it round-trips through POST/PUT/GET like any other field.

UI

• Pumping page — a "Breast" select in the add/edit dialog (defaults to "Both"); the side shows in the mobile row summary (Both · 5 oz) and in a new "Breast" column in the desktop table.
• Quick log dialog — the same select for the pump category.
• Dashboard — recent-activity pump entries read Pump · Left · 4 oz.

Reporting

• Activity history and the daily summary email include the side (pumped 4 oz · left breast).

Testing

• npm test -w server — 74 passed, including four new Pumping API tests covering side round-trip on create, omitted side staying NULL, updating the side via PUT, and the CHECK constraint rejecting an unknown value.
• npm test -w client — 84 passed.
• npm run build -w client and npm run build -w server both clean.

One thing worth flagging: an invalid side surfaces as a 500, not a 400. That's pre-existing behavior of the shared createChildScopedCrud helper for every CHECK constraint (feeding type behaves the same way), so I left the error semantics alone rather than changing the shared helper as part of this feature — happy to fix that separately if you want.

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