fix(tmdb): resolve confirmed review findings — matching correctness, race guards, cache schema

Fixes the confirmed findings from the PR #1123 code review:

- Stalker search: setSelectedContentType now runs BEFORE setSelectedItem,
  so the TMDB enrichment gate in the selection hook no longer sees the
  content type of the previously open tab (wrong/no enrichment after
  ITV -> search -> movie).
- Title normalization is now two-tier (normalizeTitleKeys): the exact
  normalized form keeps a trailing year, the base form strips it and
  remembers the tag. Year stripping is anchored to the end of the title
  ("2001: A Space Odyssey" keeps its year) and language-prefix stripping
  is UPPERCASE-only ("It: Chapter Two" is no longer amputated).
- All catalog matching (similar rail, actor pages, DB worker
  DB_MATCH_TITLES) compares exact forms first and only accepts
  year-stripped matches when the stripped tag is year-compatible (+-1)
  with the TMDB year — "Blade Runner" (1982) can no longer claim a
  catalog "Blade Runner 2049". CatalogTitleMatch carries the stripped
  trailingYear so the renderer can apply the guard to worker matches.
- mergedBackdrops tolerates a plain-string backdrop_path; enrichment
  merge+patch blocks are wrapped in try/catch so a malformed provider
  payload can no longer become an unhandled rejection.
- loadGlobalMatches (both actor routes) guards against actor->actor
  navigation races — a slow match for the previous person no longer
  overwrites the current one's results.
- tmdb_metadata media_type CHECK widened to ('movie','tv','person') and
  person rows now use the honest 'person' type (TmdbCacheMediaType).
  Pre-release dev DBs with the narrow CHECK are rebuilt in place — the
  table is a pure cache, so the migration is a self-healing
  drop-and-recreate keyed off sqlite_master.

Docs updated (tmdb-metadata-enrichment.md, CLAUDE.md). New regression
coverage: title-normalization.util.spec.ts, two-tier cases in
tmdb-similar.util.spec.ts and title-match.operations.spec.ts.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

libs/shared/interfaces/src/lib/electron-api.interface.ts

@@ -31,7 +31,7 @@ import {
 import { PortalDebugEvent } from './portal-debug.interface';
 import { CatalogTitleMatch } from './catalog-title-match.interface';
 import { Settings } from './settings.interface';
-import { TmdbCacheEntry, TmdbMediaType } from './tmdb.interface';
+import { TmdbCacheEntry, TmdbCacheMediaType } from './tmdb.interface';
 import { XtreamCategory } from './xtream-category.interface';
 
 export const ELECTRON_BRIDGE_CONTENT_TYPES = {
@@ -780,7 +780,7 @@ export interface ElectronBridgeApi {
     ) => Promise<ElectronBridgeResult>;
     // TMDB metadata cache
     dbGetTmdbMetadata: (
-        mediaType: TmdbMediaType,
+        mediaType: TmdbCacheMediaType,
         lookupKey: string,
         language: string
     ) => Promise<TmdbCacheEntry | null>;