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/Linear/Essentional, UI/Help.svg

@@ -0,0 +1,8 @@
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+<circle cx="12" cy="12" r="4" stroke="black" stroke-width="1.5"/>
+<path d="M15 9L19 5" stroke="black" stroke-width="1.5"/>
+<path d="M5 19L9 15" stroke="black" stroke-width="1.5"/>
+<path d="M9 9L5 5" stroke="black" stroke-width="1.5"/>
+<path d="M19 19L15 15" stroke="black" stroke-width="1.5"/>
+</svg>