add design spec for quick fixes (issue #2, sub-project 3)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/superpowers/specs/2026-03-12-quick-fixes-design.md

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+# Quick Fixes (Issue #2, Sub-project 3)
+
+## Goal
+
+Three small UI corrections: rename nav tab, remove Antrag from bottom nav, fix step label voice/abbreviations.
+
+## Changes
+
+### 1. Rename nav tab
+
+In `src/routes/__root.tsx`, change the last nav item label from "Mehr" to "Einstellungen". Keep the Settings icon.
+
+### 2. Remove Antrag nav tab
+
+Remove the Antrag `<Link>` from `src/routes/__root.tsx` bottom nav (4 items → 3: Fortschritt, Kontakte, Einstellungen). The `/antrag/` route stays — it's already linked from the `antrag_gestellt` step in the process stepper (`process-stepper.tsx:142`).
+
+### 3. Update step labels
+
+Update `PROZESS_SCHRITTE` in `src/shared/lib/constants.ts` to use active voice for titles (no abbreviations) and update button labels in `src/features/prozess/components/process-stepper.tsx` to done voice (abbreviations ok):
+
+| Step | Title (active, no abbreviations) | Button (done, abbreviations ok) |
+|------|--------------------------------|-------------------------------|
+| neu | Erstgespräch durchführen | Erstgespräch durchgeführt |
+| diagnose_erhalten | Diagnose erhalten | Diagnose erhalten |
+| tss_beantragt | Terminservicestelle kontaktieren | TSS kontaktiert |
+| eigensuche | Eigensuche durchführen | Eigensuche abgeschlossen |
+| antrag_gestellt | Kostenerstattung beantragen | Kostenerstattung beantragt |
+
+The TSS step description in constants.ts should also spell out "Terminservicestelle" instead of "TSS" in the title. The description body can still use "TSS" as a parenthetical.
+
+Update `src/shared/lib/constants.test.ts` to match new labels.
+
+## Files changed
+
+- **Modify:** `src/routes/__root.tsx` — rename tab, remove Antrag link
+- **Modify:** `src/shared/lib/constants.ts` — step labels + descriptions
+- **Modify:** `src/features/prozess/components/process-stepper.tsx` — button labels
+- **Modify:** `src/shared/lib/constants.test.ts` — update expected values