fix(feeds): restore feed management table layout

[marcomarcogd]

Description

Restore a stable, aligned feed-management table in Settings and keep row interaction inside the settings workflow. This addresses the layout shown in #1023, where feed fields are scattered vertically and column values no longer line up.

Type of Change

• 🐛 Bug fix (non-breaking change which fixes an issue)
• 🎨 Style/UI change
• ✅ Test addition/update

Related Issues

Fixes #1023

Changes Made

• Render checkbox, icon, name/source, category, latest article, frequency, status, and actions in one shared grid definition.
• Preserve the API/user order by default and move optional sorting into a compact selector.
• Keep all columns available at narrow widths by scrolling only the table region horizontally.
• Truncate long names, URLs, and categories while retaining full values in native tooltips.
• Use existing feed images first and provide a stable RSS fallback.
• Open the feed editor from editable rows without closing Settings or changing the main-view feed selection.
• Stop checkbox/edit/delete events from triggering the row action and keep FreshRSS-managed rows locked.
• Preserve the last successful list on refresh errors and add loading, empty, error, and retry states.

Testing

Test Configuration

• OS: macOS 15
• MrRSS Version: current main
• Node Version: 24 for lint/build

Test Steps

1. Run cd frontend && npm run lint.
2. Run cd frontend && npm run build.
3. Run npx cypress run --spec cypress/e2e/feed-management.cy.ts.
4. Verify long Chinese/English text, 120 feeds, errors, sorting, row edit behavior, and empty tag responses.

Checklist

• My code follows the project's style guidelines
• I have performed a self-review of my code
• My changes generate no new warnings
• I have added tests that prove my fix is effective
• New and existing targeted tests pass locally with my changes
• This change has no dependent changes

Additional Notes

The target Cypress spec passes all 13 tests. Feed APIs, database schema, persisted ordering, and FreshRSS ownership behavior are unchanged.

Breaking Changes

None.