feat: comprehensive Wino Mail updates

- ReaderView: complete rewrite with CSS styling, headers, attachments, zoom, find, dark mode, image blocking
- Categories: DAO + UI tree widget with colors, nested categories, assignment
- Rules engine: DAO + evaluation + actions (move, mark read, flag, delete, category, forward)
- Templates: DAO + editor + manager with variables support
- Signatures: DAO + manager + auto-per-account + manual selector in compose
- ComposeView: signature combo, template selector, auto-signature on new email
- MainWindow: frameless with rounded corners, 1px border, resize from edges, no status bar
- Database: new tables (Category, MailCategory, Rule, Template, Signature) with indexes

resources/icons/SVG/Line Duotone/Food, Kitchen/Wineglass Triangle.svg

@@ -0,0 +1,5 @@
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+<path opacity="0.5" d="M12 14.5713V20.9999" stroke="black" stroke-width="1.5" stroke-linecap="round"/>
+<path opacity="0.5" d="M7.47314 9.75H16.5268" stroke="black" stroke-width="1.5" stroke-linecap="round"/>
+</svg>