Add schedule route pages and feature components (Phase 3C)

Four Modern.js routes: start page, one-way search, round-trip search,
and catch-all multi-flight details. Components wire hooks for data
fetching and render flight results with calendar navigation.

docs/superpowers/plans/2026-04-15-phase-3c-routes.md

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+# Phase 3C -- Schedule Route Pages
+
+> **Parent:** `2026-04-15-phase-3-schedule-master.md`
+> **Depends on:** 3A (URL), 3B (API/hooks)
+
+## Deliverables
+
+1. Schedule page components in `src/features/schedule/components/`
+2. Modern.js route pages in `src/routes/[lang]/schedule/`
+3. 4 routes: start, one-way, round-trip, catch-all details
+
+## Route Structure
+
+```
+src/routes/[lang]/schedule/
+  page.tsx                              -- start page
+  route/[params]/page.tsx               -- one-way search
+  route/[params]/[returnParams]/page.tsx -- round-trip search
+  [...flights]/page.tsx                 -- catch-all details
+```