Task: Redesign content editor for shared multi-channel previews

Feature

docs/FEATURES/channels.md

Goal

Make content creation feel like planning a real social post instead of filling out legacy form fields.

The editor should use one shared content body for every selected target channel, show selectable target channels as a vertical tab-style list, and preview the same content in platform-shaped cards for networks such as YouTube and X.

Scope

Keep content item editing in frontend/src/features/content/views/ContentItemDetailView.vue.
Replace per-channel caption editing with a shared caption and shared hashtags.
Let configured workspace channels be selected or unselected as targets.
Show target channels as a single vertical tab rail and render preview cards that look closer to social platform previews.
Convert shared hashtags into chip-style entry with suggestions from already used hashtags.
Show a workspace hashtag feed so authors can reuse existing tags.
Keep the editor focused on post text and target channels by removing confusing title, calendar, change summary, and base-caption fields.
Make target preview tabs compact.
Move the create content entry point into the top app menu bar.
Remove the asset-management tab from the content detail production panel.
Preserve existing save payloads and backend contracts.

Validation

cd frontend
npm run build

Acceptance Criteria

Content authors select target channels with checkbox-like controls.
The same shared content appears on every selected channel preview.
The editor includes platform-specific preview treatment for YouTube and X/Twitter.
Saving still creates or revises a content item with the selected targets.
Hashtags commit to removable chips as they are entered.
Already used hashtags are available as suggestions.
The editor shows a workspace hashtag feed with usage counts.
The editor no longer shows title, calendar, change summary, or base-caption fields.
Target channel tabs use compact icon-only buttons with channel names as accessible labels and tooltips.
Create content is available from the top app menu bar.
Assets are no longer shown in the content detail production panel.

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