feat(downloads): redesign download manager (#1313)

* docs(downloads): specify manager MVP redesign

* docs(downloads): plan manager MVP implementation

* docs(downloads): tighten manager validation plan

* fix(downloads): keep renderer download state global

* fix(downloads): make active count accessible

* feat(downloads): derive queue and library view model

* test(downloads): close view model coverage gaps

* fix(downloads): stabilize malformed view model data

* refactor(downloads): isolate library navigation

* fix(downloads): report library navigation failures

* feat(downloads): add ready-to-watch library

* feat(downloads): add active download queue

* feat(downloads): finish manager MVP

* docs(downloads): clarify detail-first offline behavior

* docs(downloads): plan detail navigation follow-up

* fix(downloads): open completed movies in details

* test(downloads): cover pending series navigation

* fix(downloads): honor the global cover size

* fix(downloads): prefer local playback in shared details

* fix(downloads): preserve external launch priority

* fix(downloads): prefer local playback in Xtream details

* test(downloads): cover offline detail journey

* docs(downloads): document offline detail behavior

* docs(downloads): format detail navigation plan

* fix(downloads): open Stalker items in provider details

* docs(downloads): clarify Stalker navigation fallback

* fix(xtream): isolate reused detail identities

* fix(xtream): ignore stale VOD positions

* fix(downloads): keep offline Xtream playback available

* docs(downloads): clarify provider playback availability

* docs(downloads): design missing-file recovery

* docs(downloads): plan missing-file recovery

* feat(downloads): derive completed file availability

* feat(downloads): recover missing completed files

* feat(downloads): refresh missing local files

* feat(downloads): separate missing files from ready media

* feat(downloads): surface missing files for recovery

* refactor(downloads): simplify ready cards

* test(downloads): cover missing-file and series journeys

* feat(downloads): finish missing-file recovery

* docs(downloads): design offline detail views

* docs(downloads): plan offline detail views

* feat(downloads): persist offline metadata snapshots

* fix(downloads): complete metadata snapshot bridge contract

* feat(downloads): manage offline metadata snapshots

* fix(downloads): harden metadata snapshot updates

* fix(downloads): restrict snapshot artwork

* fix(downloads): guard restart artwork URL

* fix(downloads): refine artwork URL checks

* feat(downloads): expose offline metadata updates

* fix(downloads): keep metadata service change focused

* fix(downloads): preserve metadata error conventions

* feat(downloads): derive offline detail content

* fix(downloads): preserve unknown episode coordinates

* feat(downloads): add focused offline detail routes

* fix(downloads): ignore fragments in shell route state

* fix(downloads): normalize fragments before queries

* feat(downloads): open ready cards in offline details

* fix(downloads): use native disabled card styles

* feat(downloads): enrich offline detail metadata

* fix(downloads): harden offline metadata resolution

* fix(downloads): preserve stalker provider titles

* fix(downloads): distinguish stalker metadata seeds

* fix(downloads): stabilize offline metadata refresh

* fix(downloads): throttle sparse metadata refreshes

* fix(downloads): type metadata language settings

* feat(downloads): render offline movie and series details

* fix(downloads): harden offline detail interactions

* fix(downloads): close offline detail edge cases

* feat(downloads): hand off to provider-only details

* fix(downloads): preserve stalker provider handoff

* feat(downloads): capture metadata at download time

* fix(downloads): preserve snapshot source semantics

* fix(downloads): preserve episode snapshot identity

* docs(downloads): document offline details flow

* docs(downloads): clarify stalker provider fallback

* test(downloads): cover offline detail journeys

* test(downloads): stabilize offline detail selectors

* style(downloads): format changed files

* docs(downloads): clean design spec formatting

* fix(downloads): preserve offline library ownership

* test(downloads): fix Windows workspace navigation

* test(database): preserve Electron tsconfig resolution

* perf(downloads): avoid blocking file availability probes

libs/shared/database/src/lib/schema.ts

@@ -115,9 +115,7 @@ export const content = sqliteTable(
         categoryIdx: index('idx_content_category').on(table.categoryId),
         titleIdx: index('idx_content_title').on(table.title),
         xtreamIdx: index('idx_content_xtream').on(table.xtreamId),
-        epgChannelIdx: index('idx_content_epg_channel').on(
-            table.epgChannelId
-        ),
+        epgChannelIdx: index('idx_content_epg_channel').on(table.epgChannelId),
         categoryTypeXtreamUnique: uniqueIndex(
             'content_category_type_xtream_unique'
         ).on(table.categoryId, table.type, table.xtreamId),
@@ -315,9 +313,7 @@ export const downloads = sqliteTable(
     'downloads',
     {
         id: integer('id').primaryKey({ autoIncrement: true }),
-        playlistId: text('playlist_id')
-            .notNull()
-            .references(() => playlists.id, { onDelete: 'cascade' }),
+        playlistId: text('playlist_id').notNull(),
         // Content identifiers
         xtreamId: integer('xtream_id').notNull(),
         contentType: text('content_type', {
@@ -335,6 +331,7 @@ export const downloads = sqliteTable(
         posterUrl: text('poster_url'),
         requestHeaders: text('request_headers'),
         resumeValidator: text('resume_validator'),
+        metadataSnapshot: text('metadata_snapshot'),
         // Download progress
         status: text('status', {
             enum: [
@@ -376,7 +373,9 @@ export const tmdbMetadata = sqliteTable(
     'tmdb_metadata',
     {
         id: integer('id').primaryKey({ autoIncrement: true }),
-        mediaType: text('media_type', { enum: ['movie', 'tv', 'person'] }).notNull(),
+        mediaType: text('media_type', {
+            enum: ['movie', 'tv', 'person'],
+        }).notNull(),
         lookupKey: text('lookup_key').notNull(),
         language: text('language').notNull(),
         tmdbId: integer('tmdb_id'),