feat: replace blue accent with dark green visual identity

[Copilot]

Replaces the blue accent color palette with a dark green tone across the entire frontend, covering both Light and Dark themes plus all interaction states (hover, focus, active).

Changes

• Light Mode — primary #1976d2 → #2e7d32, hover #1565c0 → #1b5e20; all blue-tinted shadows and interactive backgrounds swapped for green equivalents
• Dark Mode — primary #64b5f6 → #66bb6a, hover #42a5f5 → #43a047; button hover/active backgrounds replaced (#1a237e/#283593 → #1b5e20/#2e7d32)
• All changes are purely token-level in frontend/style.css — no component markup touched

/* Before */
--primary-color: #1976d2;
--primary-hover: #1565c0;

/* After */
--primary-color: #2e7d32;
--primary-hover: #1b5e20;

Screenshots

Light Mode

Dark Mode

[rtraidcleverit]

esta correcto