feat(themes): add new premium themes and overhaul legacy ones

[bajrangCoder]

Adds 7 new themes and overhauls 6 broken legacy themes for better usability and visual quality.

New Themes

Theme	Type	Description
Obsidian	Dark	Luxurious charcoal with rich gold accents
Ember	Dark	Warm cocoa tones with copper/amber accents
Dusk	Dark	Deep indigo twilight with violet accents
Carbon	Dark	Ultra-clean neutral with precise blue accents
Mint	Light	Fresh and calming with emerald green
Sandstone	Light	Warm earthy tones with terracotta accents
Blossom	Light	Soft elegant rose with pink undertones

Redesigned Legacy Themes

Theme	What changed
Bump	Replaced clashing lavender/gold with cohesive navy + coral palette
Bling	Swapped unreadable orange body text for clean light text + emerald accent
Moon	Fixed neon cyan body text and invisible teal-on-teal buttons
Atticus	Removed random blue/teal clashes, now earthy + sage green
Tomyris	Fixed pink/blue text inconsistency, now deep berry + fuchsia
Menes	Fixed blue-on-blue invisible buttons, now cool dark + vivid green

[greptile-apps]

Greptile Summary

This PR adds 7 new premium dark/light themes (Obsidian, Ember, Dusk, Carbon, Mint, Sandstone, Blossom) and significantly overhauls 6 legacy themes (Bump, Bling, Moon, Atticus, Tomyris, Menes) to fix readability and palette-coherence issues. All changes are contained in src/theme/preInstalled.js and integrate correctly with the existing ThemeBuilder/createBuiltInTheme infrastructure.

Key observations:

• All new themes correctly set darkenedPrimaryColor, buttonBackgroundColor/TextColor/ActiveColor, boxShadowColor, activeTextColor, errorTextColor, dangerColor, scrollbarColor, and preferredEditorTheme, aligning them with the more complete theme pattern established by glassDark and sunset.
• The 6 overhauled legacy themes now include previously-missing fields (boxShadowColor, activeTextColor, errorTextColor, dangerColor, scrollbarColor) and each gains a preferredEditorTheme that was absent before.
• Dark themes created without an explicit type argument correctly default to "dark" via ThemeBuilder's constructor default, and light themes (Mint, Sandstone, Blossom) correctly pass "light".
• Contrast concern: The Mint light theme's activeColor (~2.4:1) and linkTextColor (~3.4:1) against its near-white primaryColor background fall short of WCAG AA thresholds (3:1 for UI components, 4.5:1 for normal text). All other light themes in the file (Light, Sunset, Sandstone, Blossom) use darker accent/link hues that comfortably clear these ratios.

Confidence Score: 4/5

• Safe to merge with one minor accessibility concern in the Mint light theme.
• The changes are additive and purely cosmetic (CSS variable values). No logic, control flow, or APIs are touched. All new properties map to valid ThemeBuilder setters, and new themes are correctly appended to the export array. The only concern is a WCAG contrast shortfall in mint.activeColor and mint.linkTextColor which affects readability for some users but does not break functionality.
• src/theme/preInstalled.js — specifically the Mint light theme block (lines 457–478) for the low-contrast active/link colours.

Important Files Changed

Filename	Overview
src/theme/preInstalled.js	Adds 7 new premium themes and overhauled 6 legacy themes. Changes are structurally sound and follow existing patterns. One contrast issue found in the Mint light theme where the active/link colors fall below WCAG AA requirements against the near-white background.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A["createBuiltInTheme(name, type?, version='paid')"]
    A --> B["new ThemeBuilder(name, type='dark', version)"]
    B --> C["autoDarkened = false"]
    C --> D{Theme type?}
    D -- "dark (Obsidian, Ember, Dusk, Carbon, Bump, Bling, Moon, Atticus, Tomyris, Menes)" --> E["Set dark palette properties\n(darkenedPrimaryColor, primaryColor, etc.)"]
    D -- "light (Mint, Sandstone, Blossom)" --> F["Set light palette properties\n(light primaryColor, dark text, etc.)"]
    E --> G["Set shared properties\n(buttonBg/Text/Active, boxShadow,\nactiveText, error, danger, scrollbar)"]
    F --> G
    G --> H["Set preferredEditorTheme\n(one_dark / tokyoNight / monokai / noctisLilac)"]
    H --> I["Export array\n(system, dark, light, ... menes,\nobsidian, ember, dusk, carbon,\nmint, sandstone, blossom, custom)"]

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_{Last reviewed commit: 0193d97}