feat: refine content calendar experience

docs/TASKS/content/007-content-comment-composer-toolbar.md

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+# Task: Polish content detail comment composer
+
+## Goal
+
+Make the content detail production comments composer feel like a collaboration input instead of a detached form.
+
+## Scope
+
+- Show the current user's avatar inside the comment composer.
+- Put the comment textarea to the right of the avatar.
+- Move the post action into the composer bottom row.
+- Add bottom-row controls for internal comment intent, media references, and member mentions.
+- Upload comment attachments from the user's computer to workspace blob storage.
+- Show uploaded comment attachments inline in the comment thread.
+- Add the minimal comments API contract and persistence needed for inline attachments.
+
+## Relevant Files
+
+- `frontend/src/features/content/views/ContentItemDetailView.vue`
+- `frontend/src/features/content/components/ContentCommentComposer.vue`
+- `frontend/src/features/content/components/ContentCommentFeed.vue`
+- `frontend/src/features/content/stores/contentItemDetailStore.js`
+- `backend/src/Socialize.Api/Modules/Comments/`
+- `shared/openapi/openapi.json`
+
+## Validation
+
+```bash
+cd frontend
+npm run build
+cd ..
+dotnet build backend/src/Socialize.Api/Socialize.Api.csproj -v minimal
+dotnet test backend/tests/Socialize.Tests/Socialize.Tests.csproj --no-build -v minimal
+```