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Adds two specs for extending issue #294 with bulk uploads: - bulk-upload-concepts.html — three concepts (stack, split-panel with file switcher, progressive accordion) with a decision matrix and the Concept B recommendation. - bulk-upload-split-panel-spec.html — refined final spec for Concept B. Covers all three states (N=0 empty · N=1 single · N≥2 multi) across 320 / 375 / 768 / 1280 viewports in both light and dark mode, using the real tokens from layout.css. Includes impl-ref tables for every new surface, Paraglide keys in de/en/es, component tree, and backend contract. The polymorphic-state model means /documents/new is a single route: N=1 is byte-identical to #294, N=0 shows a whole-panel drop zone with bulk-first copy, N≥2 grows a file-switcher strip under the PDF preview plus a two-card form split. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>