Initial TrueGrowth source import

openspec/changes/update-media-generation-mode-hub/specs/video-batch-generation/spec.md

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+## ADDED Requirements
+### Requirement: Video Generation Page SHALL Provide Mode Switching
+The system SHALL let users switch video creation modes inside the video generation page, including normal video generation, popular video generation, and popular MV generation.
+
+#### Scenario: Switch between video modes
+- **GIVEN** the user is on the video generation page
+- **WHEN** the user selects normal video generation, popular video generation, popular MV generation, or another supported video creation mode
+- **THEN** the page updates the active workflow for that mode
+- **AND** keeps the user on the same video page
+
+#### Scenario: Popular video and MV modes preserve batch behavior
+- **WHEN** the user selects popular video generation or popular MV generation
+- **THEN** the page exposes the existing storyboard, lens, model, size, and batch-generation controls required by that workflow
+- **AND** the existing serial batch generation requirements remain in effect
+
+### Requirement: Video Generation Page SHALL Remove Legacy Tool Context Header
+The video generation page SHALL not render the legacy `tg-tool-context` top context bar.
+
+#### Scenario: User views video generation page
+- **WHEN** the video generation page renders
+- **THEN** the top page controls are mode-focused
+- **AND** no `tg-tool-context` header is shown above the video workflow