feat: enhance Twitter save rules with collection selection and improve settings UI

[lcomplete]

Summary

• Add collection picker support to Twitter save rules, allowing users to save tweets, bookmarks, and likes directly to specific collections
• Introduce social media icons to IconPicker with offline icon registry support for reliable icon loading
• Modernize ArticleShortcutSetting and TwitterSaveRulesSetting UI with consistent styling, better empty states, and improved dialog designs

Test plan

• Verify Twitter save rules can be configured with collection selection
• Confirm IconPicker displays new social media icons correctly
• Test that article shortcut settings UI renders properly with drag-and-drop functionality
• Validate dialog styling and empty states render as expected

🤖 Generated with Claude Code

[augmentcode]

🤖 Augment PR Summary

Summary: Enhances Twitter save rules by allowing tweets/bookmarks/likes to be saved directly into a chosen Collection, and refreshes several settings UIs for a more consistent modern look.

Changes:

• Added per-rule collection targets to TwitterUserSetting (client + server) for tweets, bookmarks, and likes.
• Updated backend tweet capture flow to apply the selected collection and library status when saving Twitter content.
• Revamped TwitterSaveRulesSetting UI with rule “cards”, improved controls, and a collection picker dialog integration.
• Modernized ArticleShortcutSetting with drag handles, improved dialogs, and clearer empty/import states.
• Extended IconPicker with a Social icon section and an offline icon registry for reliable icon rendering.
• Added @iconify-json/flat-color-icons dependency to bundle icons locally.

Technical Notes: Collection selection is backed by fetching the collection tree in settings, and icon registration is done via a side-effect import to support offline use.

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