feat(gui): consolidate Settings and add theme switching

[AprilNEA]

Summary

Folds the standalone About window into Settings and rebuilds the window around a gpui-component-driven theme system.

• Settings layout — About is now an About page; update controls move to a dedicated Updates page; a new Appearance page hosts the appearance picker, colour-theme grid, corner radius, and language (Language and Theme appear as sidebar sub-items).
• Theme switching — theme::palette derives from cx.theme() tokens, so every bespoke surface re-skins with the selected theme. A committed OpenLogi light/dark theme reproduces the previous look; the upstream gpui-component themes are selectable too.
• macOS-style appearance picker — light / dark / follow-system rendered as three preview thumbnails.
• Persistence — appearance / theme / radius persist in AppSettings; the macOS titlebar (NSApp appearance) follows the chosen mode.
• auto_install_updates — opt-in background download + stage, applied on next restart.

Themes via build.rs (not vendored)

Only the OpenLogi brand theme is committed (themes/openlogi.json). The 21 upstream gpui-component themes are not vendored into the repo: build.rs locates gpui-component's source via cargo metadata (robust across the local git cache, CI, and Nix's vendored tree) and embeds its theme files into OUT_DIR. OPENLOGI_THEMES_DIR overrides the lookup.

Refactor / components

• The Settings page builders are split into per-page submodules under windows/settings/.
• Reuses gpui-component widgets where they fit: Tag for update-status chips, ButtonGroup for the corner-radius picker. The About link row is a uniform row of small ghost buttons with Lucide icons (changelog/bug vendored under action-icons/, since gpui-component's IconName set lacks them).

Verification

• cargo clippy --all-targets -- -D warnings (incl. the build script) clean; cargo test -p openlogi-gui green.
• This branch carries no Nix package files; cargo metadata is expected to resolve the themes dir under Nix, with OPENLOGI_THEMES_DIR as the escape hatch.

[greptile-apps]

Greptile Summary

This PR consolidates the standalone About window into the Settings panel and introduces a gpui-component-driven theme system. Settings is refactored into per-page submodules, and the Appearance page exposes a light/dark mode picker, theme grid, corner-radius selector, and language chooser. Persistence (appearance, theme slots, radius) lands in AppSettings and survives restarts.

• Appearance/theme switching — apply_from_settings becomes the single entry point for first paint, OS-appearance observers, and live settings edits; it hydrates both theme slots from the registry and applies any radius override after Theme::change so it isn't clobbered by the theme's own value.
• build.rs theme embedding — Upstream gpui-component themes are located at build time via cargo metadata and embedded via include_str!/OUT_DIR, keeping 21 theme JSON files out of the repo while remaining robust across local git caches, CI, and Nix-vendored trees.
• Auto-install updates — A new auto_install_updates preference wires a GPUI observer to Updater; a found update downloads and stages in the background, applied on next restart.

Confidence Score: 5/5

Safe to merge — all changes are additive UI/UX improvements with no mutations to persisted device config, no schema-breaking changes (all new fields carry serde(default)), and the two prior blocking issues from review round 1 are correctly resolved.

The core logic — theme application, persistence, OS appearance sync, auto-install observer — is well-guarded: radius override is applied after Theme::change so it isn't clobbered, the auto-install observer guards on Available to avoid re-entry, and the Follow-System check in theme_card prevents wiping the mode preference. The remaining observations are display cosmetics and a maintenance brittleness in the deep-link page index, none of which affect correctness at runtime.

crates/openlogi-gui/src/windows/settings/updates.rs (download progress display and hardcoded URL) and crates/openlogi-gui/src/windows/settings.rs (hardcoded deep-link page indices).

Important Files Changed

Filename	Overview
crates/openlogi-gui/build.rs	New build script: locates gpui-component themes via cargo metadata JSON scanning and embeds them into OUT_DIR; includes an OPENLOGI_THEMES_DIR escape hatch. The manifest_paths parser assumes no JSON-escaped characters in paths (macOS/Linux only, acknowledged).
crates/openlogi-gui/src/theme.rs	Replaces hand-painted Palette variants with tokens derived from cx.theme(); adds register_builtin_themes and apply_from_settings as the sole theme-change entry point. Radius override is correctly applied after Theme::change to avoid being reset by the theme config.
crates/openlogi-gui/src/windows/settings/appearance.rs	New Appearance settings page with mode picker thumbnails, theme grid with filter/search, radius ButtonGroup, and language selector. Previous issues with Follow-System mode override and radius hardcoding are correctly addressed.
crates/openlogi-gui/src/windows/settings/updates.rs	New Updates settings page with hero card, status pill, check/install/restart action, and auto-install toggle. Integer truncation in the download progress display shows "0 MB" for sub-megabyte downloads; the source URL label is also hardcoded independently of RELEASES_URL.
crates/openlogi-gui/src/windows/settings.rs	Refactored into a thin coordinator that re-exports shared imports and delegates each page to a submodule. The SettingsPage::About hardcoded index (5) must stay in sync with the page chain order manually; a mismatch would silently navigate to the wrong page.
crates/openlogi-gui/src/platform/updater.rs	Adds AutoInstaller global holding the auto-install observer alive; fires download_and_install when the updater enters Available status and the setting is on. The condition guard on Available prevents re-entry once downloading.
crates/openlogi-core/src/config.rs	Adds Appearance enum, auto_install_updates, theme_light/dark, and ui_radius to AppSettings with serde(default) for backward compatibility. Adds has_app_override helper.
crates/openlogi-gui/src/windows/settings/about.rs	New About settings page with hero card, build identity, link buttons using custom action icons, diagnostics copy with generation-guarded 2s reset timer, and config-file reveal button.
crates/openlogi-gui/src/state.rs	Adds set_auto_install_updates, set_appearance, set_theme, and set_ui_radius with no-op guards on unchanged values and atomic config persistence.

Sequence Diagram

%%{init: {'theme': 'neutral'}}%%
sequenceDiagram
    participant User
    participant SettingsView
    participant AppState
    participant theme_apply as theme::apply_from_settings
    participant ThemeRegistry
    participant Theme
    participant OS as platform::os

    User->>SettingsView: click mode card / theme card / radius btn
    SettingsView->>AppState: set_appearance / set_theme / set_ui_radius
    AppState->>AppState: save_atomic (persist to disk)
    SettingsView->>theme_apply: apply_from_settings(None, cx)
    theme_apply->>AppState: read appearance, theme_light, theme_dark, ui_radius
    theme_apply->>OS: set_app_appearance(appearance)
    theme_apply->>theme_apply: cx.window_appearance() → os_appearance
    theme_apply->>ThemeRegistry: pick light and dark theme configs
    theme_apply->>Theme: set light_theme / dark_theme
    theme_apply->>Theme: Theme::change(mode, None, cx)
    Note over Theme: resets radius to theme default
    theme_apply->>Theme: "global_mut(cx).radius = user override (if any)"
    theme_apply->>SettingsView: cx.refresh_windows()

    Note over User,OS: OS appearance change (System mode)
    OS-->>SettingsView: observe_window_appearance fires
    SettingsView->>theme_apply: apply_from_settings(Some(window), cx)
    theme_apply->>Theme: Theme::change(ThemeMode::from(os), Some(window), cx)

Loading

%%{init: {'theme': 'base', 'themeVariables': {"darkMode": true, "background": "#0d1117", "primaryColor": "#21262d", "primaryTextColor": "#e6edf3", "primaryBorderColor": "#8b949e", "lineColor": "#8b949e", "textColor": "#e6edf3", "edgeLabelBackground": "#161b22", "actorBkg": "#21262d", "actorBorder": "#8b949e", "actorTextColor": "#e6edf3", "actorLineColor": "#8b949e", "signalColor": "#8b949e", "signalTextColor": "#e6edf3", "noteBkgColor": "#373320", "noteBorderColor": "#d4a72c", "noteTextColor": "#f0e6c0", "labelBoxBkgColor": "#21262d", "labelBoxBorderColor": "#8b949e", "labelTextColor": "#e6edf3", "loopTextColor": "#e6edf3", "activationBkgColor": "#30363d", "activationBorderColor": "#8b949e"}}}%%
sequenceDiagram
    participant User
    participant SettingsView
    participant AppState
    participant theme_apply as theme::apply_from_settings
    participant ThemeRegistry
    participant Theme
    participant OS as platform::os

    User->>SettingsView: click mode card / theme card / radius btn
    SettingsView->>AppState: set_appearance / set_theme / set_ui_radius
    AppState->>AppState: save_atomic (persist to disk)
    SettingsView->>theme_apply: apply_from_settings(None, cx)
    theme_apply->>AppState: read appearance, theme_light, theme_dark, ui_radius
    theme_apply->>OS: set_app_appearance(appearance)
    theme_apply->>theme_apply: cx.window_appearance() → os_appearance
    theme_apply->>ThemeRegistry: pick light and dark theme configs
    theme_apply->>Theme: set light_theme / dark_theme
    theme_apply->>Theme: Theme::change(mode, None, cx)
    Note over Theme: resets radius to theme default
    theme_apply->>Theme: "global_mut(cx).radius = user override (if any)"
    theme_apply->>SettingsView: cx.refresh_windows()

    Note over User,OS: OS appearance change (System mode)
    OS-->>SettingsView: observe_window_appearance fires
    SettingsView->>theme_apply: apply_from_settings(Some(window), cx)
    theme_apply->>Theme: Theme::change(ThemeMode::from(os), Some(window), cx)

Loading

_{Reviews (2): Last reviewed commit: "fix(gui): gate per-platform Settings imp..." | Re-trigger Greptile}