Update seller store experience

packages/database/migrations/014_collection_asset_variant_fk.sql

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+SET search_path TO atlas, public;
+
+-- `workspace_id` is the tenant boundary and is never nullable. PostgreSQL's
+-- unqualified ON DELETE SET NULL on a composite FK clears every referencing
+-- column, including workspace_id. Only the optional variant pointer may be
+-- cleared when a re-collected source snapshot replaces its variants.
+ALTER TABLE collection_asset_transfers
+    DROP CONSTRAINT collection_asset_transfers_workspace_id_source_variant_id_fkey;
+
+ALTER TABLE collection_asset_transfers
+    ADD CONSTRAINT collection_asset_transfers_workspace_id_source_variant_id_fkey
+    FOREIGN KEY (workspace_id, source_variant_id)
+    REFERENCES product_variants(workspace_id, id)
+    ON DELETE SET NULL (source_variant_id);

packages/database/migrations/015_collection_asset_pending_selection.sql

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+SET search_path TO atlas, public;
+
+-- Source-image candidates are recorded during collection but are not fetched
+-- until the user actually selects one for editing, processing or publishing.
+ALTER TYPE processing_status ADD VALUE IF NOT EXISTS 'pending_selection';

packages/database/migrations/016_collection_asset_pending_selection_default.sql

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+SET search_path TO atlas, public;
+
+ALTER TABLE collection_asset_transfers
+    ALTER COLUMN status SET DEFAULT 'pending_selection';
+
+CREATE INDEX ix_collection_asset_transfers_pending_selection
+    ON collection_asset_transfers (workspace_id, collection_item_id, source_snapshot_revision, created_at)
+    WHERE status = 'pending_selection';

packages/database/migrations/017_collection_video_candidates.sql

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+SET search_path TO atlas, public;
+
+CREATE TYPE collection_media_type AS ENUM ('image', 'video');
+
+ALTER TABLE collection_asset_transfers
+    ADD COLUMN media_type collection_media_type NOT NULL DEFAULT 'image',
+    ADD COLUMN poster_url TEXT;
+
+CREATE INDEX collection_asset_transfers_media_status_idx
+    ON collection_asset_transfers (workspace_id, media_type, status, created_at);