# Change: Consolidate media generation modes into page-level hubs

## Why
The current image and video navigation still feels like it inherited canvas-era single-purpose entries. Operators need richer generation modes, including batch image generation, popular video generation, popular MV generation, and music generation, available as mode switches inside the relevant media pages rather than scattered or hidden behind App Center/toolbox cards.

## What Changes
- Turn the image generation page into a mode hub where users can switch between text-to-image, image-to-image/edit, batch image generation, and related image creation modes without leaving the page.
- Turn the video generation page into a mode hub where users can switch between normal video generation, popular video generation, popular MV generation, and relevant video creation modes without falling back to a separate toolbox page.
- Expose music generation as a selectable creation mode in the same media-generation experience, while preserving its existing Suno generation/continue/infill behavior.
- Keep App Center as the discovery surface, but route image/video/music cards into the correct page mode instead of making users find separate legacy tools.
- Remove the `tg-tool-context` top context bar from image and video generation pages and replace it with mode-level navigation and compact page controls.

## Impact
- Affected specs: app-center, image-generation, video-batch-generation, audio-generation
- Affected code: `apps/web/src/workbench/app-definitions.tsx`, `apps/web/src/workbench/WorkbenchShell.tsx`, Drawnix image/video/music generation surfaces, workbench styling around `tg-tool-context`