Release v2.8.0

✨ Features

• feat(system): emit PixelArt sprites for monitor_cpu (c488add)
• feat(system): emit PixelArt sprites for monitor_battery (6cfbcd6)
• feat(system): pixel-art sprite catalog for the monitor family (f051c72)
• feat(clock): PixelArt sprites for moon_phase and season (9e48fa3)
• feat(read_store): support PixelArt shape (792cdbd)
• feat(weather): emit PixelArt sprites for current conditions (ca78384)
• feat(render): add PixelArt shape + media_pixel renderer (b275bde)

🐛 Bug Fixes

• fix(weather): thicken fog sprite bands for half-block readability (f14bd32)

📝 Other Changes

• chore: bump version to v2.8.0 (93ea391)
• chore(deps)(deps): bump ratatui-image from 11.0.2 to 11.0.3 (ef93a3f)
• chore(deps)(deps): bump netdev from 0.43.0 to 0.44.0 (b314eae)
• chore(deps)(deps): bump chrono from 0.4.44 to 0.4.45 (8add2a5)
• chore(ci)(deps): bump codecov/codecov-action from 6 to 7 (505b58d)
• test(render): cover media_pixel in registry / shape / snapshot lists (22251b1)
• chore(deps)(deps): bump gix from 0.83.0 to 0.84.0 (5fe5a50)
• chore(deps)(deps): bump sysinfo from 0.39.2 to 0.39.3 (0431c78)
• chore: sync llm pricing from LiteLLM (641adcb)
• test(fetcher/codex_usage): compute fixture path from today's date (ac64f2f)
• chore(deps)(deps): bump serde_json from 1.0.149 to 1.0.150 (80f0ab6)
• chore(ci)(deps): bump peter-evans/create-pull-request from 7 to 8 (b985319)
• chore: update flake.nix hashes for v2.7.0 (e2b8b74)