feat: implement cartoony cobweb theme per project vision

[ChefControl]

Context

The project vision states: "The theme of this project should be cartoony, playful, and fun. The main theme is cobweb (as it's a crawler)."

The current UI is a standard professional design with neutral grays and blue accents. There is no thematic identity — no logo, no spider/cobweb imagery, no custom colors, no playful elements.

Proposed Solution

• Design a logo/mascot (friendly spider or cobweb icon)
• Define a themed color palette in Tailwind config (cobweb-inspired colors)
• Add cobweb visual elements (background patterns, themed loading spinners, empty states)
• Use playful micro-copy (e.g., "The web awaits... start spinning!" instead of "No crawls yet")
• Add fun loading states and micro-interactions
• Add dark mode toggle (graph view already uses dark background)

Files to Modify

• frontend/tailwind.config.js — custom colors, fonts, design tokens
• frontend/src/App.tsx — themed navbar with logo
• frontend/src/pages/* — playful micro-copy and themed empty states
• frontend/src/components/* — themed loading spinners, visual elements

Acceptance Criteria

• Project has a recognizable visual identity (logo/mascot)
• Custom color palette applied throughout the app
• Cobweb/spider visual elements present
• Loading states and empty states are fun and thematic
• Dark mode toggle available

[ChefControl]

A workspace is ready for this issue.

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