fix(nuxt, astro): a file-routed page is bound to its component (#2267)

A Nuxt pages/x.vue or Astro src/pages/x.astro route linked to nothing, so
the viewer's Steps drew a page alone and the routes list never named what
serves it. Each page route now references its file's own component (never a
same-named one — every index.vue is a component named index), an Astro
endpoint its exported verb handlers, and the routing manifest accepts a
component as what serves a route, which also lists Vue Router screens.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

src/db/queries.ts

@@ -1204,7 +1204,8 @@ export class QueryBuilder {
     if (!this.stmts.getRoutingManifest) {
       // Edge kind varies across framework resolvers: Spring/Rails/
       // Laravel/Drupal emit `references`, Express emits `calls`. Accept
-      // both — the semantic is the same (route → its handler).
+      // both — the semantic is the same (route → its handler). A screen in
+      // a Vue / Svelte / Astro app is served by a `component`.
       this.stmts.getRoutingManifest = this.db.prepare(`
         SELECT
           r.name AS url,
@@ -1220,7 +1221,7 @@ export class QueryBuilder {
         JOIN nodes h ON e.target = h.id
         WHERE r.kind = 'route'
           AND e.kind IN ('references', 'calls')
-          AND h.kind IN ('function', 'method', 'class', 'constant', 'variable')
+          AND h.kind IN ('function', 'method', 'class', 'constant', 'variable', 'component')
         ORDER BY r.file_path, r.start_line
         LIMIT ?
       `);