[httpsphl]

What

• The avatar palette grows from 8 to 16 colors (red, blue, magenta, green, tangerine, slate, brown, snow appended), so existing bots keep theirs and the daemon's auto-assign order only changes after the 8th bot.
• New Pick any color button after the swatches in the create/edit bot dialog opens a free picker: saturation/brightness square (pointer or arrow keys, Shift for bigger steps), hue slider, and the color as hex and R, G, B. All of them edit the same color.
• A bot whose color is outside the palette opens the dialog with the picker already open.
• Strings in en, pt-BR and es; spec 15.3 updated.

The daemon already accepted any #RRGGBB (normalize_color), so no protocol change beyond the generated AVATAR_PALETTE.

Tests

• color.test.tsx: hex/RGB/HSV round-trip for every palette color, hex parsing, saving a hex color and an R/G/B color through the dialog, a custom color reopening with the picker.
• pnpm check, cargo fmt, clippy -D warnings, cargo test -p botloft-core pass locally.
• Checked in the browser preview: the square, hue and fields move together and the custom button shows the mascot in the picked color.

No real Claude Code involved.