Add resolved appearance engine and paired theme settings

Resolve light, dark and automatic appearance centrally and publish live theme snapshots to native surfaces and the appearance portal. Add paired preset families, custom theme imports, accessibility transforms and contrast-safe transitions.

Refine the Settings gallery and Auto controls, move overrides under advanced customization, and share palette-aware switches and circular slider thumbs. Document configuration and include theme licenses and integration coverage.

docs/theme-palette-sources.md

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+# Theme palette sources
+Ferese maps upstream palettes to desktop roles. Materials are authored for Ferese;
+text and accents have the adjustments below to meet desktop contrast requirements.
+| Family | Source revision | License |
+| --- | --- | --- |
+| catppuccin | [07d02aa110ef](https://github.com/catppuccin/palette/blob/07d02aa110ef9eb7e7427afca5c73ba9cf7f8ebd/palette.json) | MIT |
+| gruvbox | [ef8864bb42bf](https://github.com/morhetz/gruvbox/blob/ef8864bb42bf244f0295d1c5a403b27e3d139695/colors/gruvbox.vim) | MIT/X11 |
+| rose-pine | [ff483051a47e](https://github.com/rose-pine/neovim/blob/ff483051a47e27d84bdef47703538df1ed9f4a47/lua/rose-pine/palette.lua) | MIT |
+| tokyo-night | [cdc07ac78467](https://github.com/folke/tokyonight.nvim/blob/cdc07ac78467a233fd62c493de29a17e0cf2b2b6/extras/kitty/tokyonight_day.conf) | Apache-2.0; palette exports marked MIT |
+| everforest | [85a86eb62409](https://github.com/sainnhe/everforest/blob/85a86eb62409e3ec88713bff3d1b9d7374e112e4/autoload/everforest.vim) | MIT |
+
+Tokyo Night Night also uses its [official export](https://github.com/folke/tokyonight.nvim/blob/cdc07ac78467a233fd62c493de29a17e0cf2b2b6/extras/kitty/tokyonight_night.conf).
+
+## Color adjustments
+
+| Variant | Token | Upstream | Ferese |
+| --- | --- | --- | --- |
+| rose-pine-moon | muted | `#908CAA` | `#918DAA` |
+| rose-pine-dawn | muted | `#797593` | `#716D89` |
+| tokyo-night-day | text | `#3760BF` | `#3358B0` |
+| tokyo-night-day | muted | `#6172B0` | `#4D5A8C` |
+| tokyo-night-day | accent | `#2E7DE9` | `#2C76DD` |
+| everforest-light | muted | `#829181` | `#677367` |
+| everforest-light | accent | `#8DA101` | `#849601` |
+
+Catppuccin Latte uses upstream subtext1 for muted labels. Gruvbox uses readable
+foreground shades rather than its comment gray. Rosé Pine uses its subtle role
+for secondary labels and its love accent in Dawn. Everforest uses the Hard pair.
+Tokyo Night uses the upstream Night and Day exports.
+
+License texts are bundled in [assets/themes/licenses](../assets/themes/licenses)
+and copied into each installed release. Older saved Monochrome, Dracula, Ayu Light,
+and Monokai selections remain readable, but are absent from the gallery.