feat: display unread count in sidebar

[0x2E]

Fix #125

[Copilot]

Pull Request Overview

This PR implements the unread count functionality to be displayed in the sidebar by including the unread_count field in the API responses and propagating the data through to the frontend view.

• Added unread_count to FeedForm in server/feed_form.go
• Modified repo/feed.go to aggregate unread item counts and integrate them into the Feed model
• Updated frontend/src/lib/api/model.ts to reflect the new unread_count field

Reviewed Changes

Copilot reviewed 6 out of 10 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
server/feed_form.go	Added unread_count to the FeedForm struct
server/feed.go	Passed through unread_count when constructing responses
repo/feed.go	Aggregated unread count from items and updated Feed
model/feed.go	Introduced UnreadCount field in the Feed model
frontend/src/lib/api/model.ts	Updated TS model to include unread_count

Files not reviewed (4)

• frontend/package.json: Language not supported
• frontend/pnpm-lock.yaml: Language not supported
• frontend/src/lib/components/Sidebar.svelte: Language not supported
• go.mod: Language not supported

[Copilot]

[nitpick] Consider revising this comment to use more professional language, for example: 'Using multiple queries due to current GORM limitations.'

Suggested change

	// count unread items of each feed.
	// yeah this is stupid, but I don't know how to do it in a single query using GORM.
	// Count unread items of each feed.
	// Using multiple queries due to current GORM limitations.