add windows theme source and platform icon resolvers

docs/PLAN.md

@@ -100,9 +100,9 @@ One-way, no cycles. Nothing depends on `gpui-component`, `gpui-kit`, `gpuikit`,
 
 - **`IconRole`** — a semantic enum of the glyphs UI actually needs (~25 to start): chevrons, check, close, plus/minus, search, folder, warning/info/success, copy, arrow-left/right, calendar, clock, settings, dots-horizontal, … Components and apps reference roles, never glyph names.
 - **Resolver cascade per platform**, behind one `Icon` element:
-  - macOS: SF Symbols via `NSImage(systemSymbolName:)`, rasterized through AppKit at (size, weight, appearance, tint) and cached; never bundled.
-  - Windows: Segoe Fluent Icons codepoints rendered as text (system font).
-  - Linux/Omarchy: freedesktop icon-theme lookup (active theme → hicolor), SVG painted via gpui's `svg()`.
+  - macOS: SF Symbols via `NSImage(systemSymbolName:)`, rasterized through AppKit at (size, weight, appearance, tint) and cached; never bundled. Deferred — macOS rides the Lucide fallback until it shows it matters.
+  - Windows: Segoe Fluent Icons codepoints rendered as text (system font). ✅ Landed (2026-10-30): role→codepoint table transcribed from Microsoft's glyph list (Close uses ChromeClose E8BB, not Cancel E711), drawn at the icon's size in `Segoe Fluent Icons`; unverified on hardware until the Windows screenshot pass.
+  - Linux/Omarchy: freedesktop icon-theme lookup (active theme → hicolor), SVG painted via gpui's `svg()`. ✅ Landed (2026-10-30): bounded walk over `$HOME/.icons` + the XDG data dirs handling both real layouts (`size/context/` for Adwaita and Papirus, `context/size/` for Breeze); `scalable` wins, else the closest numbered size; inherits chain capped at five themes, then `hicolor`; theme name read from Omarchy's `icons.theme` → `kdeglobals [Icons]` → gsettings → Adwaita; results cached per (role, size) for the process; only `.svg` matches (PNG-only themes fall through); a miss falls back to the bundled Lucide. Resolver fixtures run on every OS.
   - Fallback everywhere: a bundled Lucide subset (ISC; attribution in NOTICE) — ships first so components work before platform resolvers land.
 - Public API stays tiny: `icon(role)` → element with `.size(...)`; tint defaults to theme tokens. A missing glyph logs once and falls back — never panics.
 - Gallery page: icon browser showing every role resolved on the current platform.
@@ -167,13 +167,13 @@ Controls through unit 10 paint from existing roles and ramps.
 | Target | Detection | Sources read | Live changes |
 | --- | --- | --- | --- |
 | macOS | compile target | `NSColor` semantic palette (`windowBackgroundColor`, `labelColor`, `controlColor`, `controlAccentColor`, `selectedTextBackgroundColor`, `keyboardFocusIndicatorColor`, …) in the effective appearance via `objc2-app-kit`; `NSWorkspace` accessibility flags | distributed notifications + GPUI appearance events |
-| Windows 11 (WinUI) | compile target | WinRT `UISettings` (`AccentColor`, `AccentLight1–3`, `AccentDark1–2`, `Background`, `Foreground`), `TextScaleFactor`, `AccessibilitySettings` high-contrast; `Personalize` registry fallback | `UISettings.ColorValuesChanged` |
+| Windows 11 (WinUI) | compile target | ✅ Landed (2026-10-30): WinRT `UISettings` (`UIColorType` Background/Foreground/Accent — the stated AccentLight/Dark variants wait until the engine takes a full ramp, D13), `TextScaleFactor` scales the root font, `AccessibilitySettings` high-contrast; `Personalize` registry fallback (mode + transparency only — the accent key is skipped). WinUI metrics: 4px control radius, 32px field height, 14px root font. Reduce-motion not read yet (Win32 SPI). Verified against the windows 0.62 bindings; a full cross-build waits for hardware (gpui's manifest embedding needs llvm-rc) | `UISettings.ColorValuesChanged` + `HighContrastChanged` |
 | GNOME / generic Linux | portal reachable (else `gsettings`) | portal `org.freedesktop.appearance` (`color-scheme`, `accent-color` as `(ddd)`, `contrast`, `reduced-motion`); `gsettings` fallback (`color-scheme` name + the libadwaita accent-name table) | portal `SettingChanged` |
 | KDE | `kdeglobals` present | `kdeglobals` `[Colors:*]` groups (Window/View/Button/Selection) + `[General] AccentColor` (`-1,-1,-1` = wallpaper-derived, covered by the portal); portal for mode/accent | inotify on `~/.config`, filtered to `kdeglobals` (survives kconfig's replace-on-write) |
 | Omarchy | `~/.local/state/omarchy` marker (`theme.name`, `current/theme`, or `~/.config/omarchy`) | `current/theme/colors.toml` (semantic keys, or the ANSI `color0..15` fallback the alacritty generator writes); portal for contrast/reduced-motion; mode from the file's `mode` key or background lightness | inotify on the `current` dir — catches theme-set's whole-directory swaps and `theme.name` writes (hand edits of the deployed copy need a switch to re-fire) |
 | Fallback / unknown | none of the above, or reader failure | bundled neutral light/dark theme | manual only |
 
-Linux adapters landed 2026-10-30 (fixture-tested parsers on every OS; payload facts transcribed from the portal spec, plasma's Breeze schemes, omarchy's `bin/omarchy-theme-set`, and libadwaita). The pinned gpui's `AsyncApp` is not `Send`, so watcher threads signal through an `async_channel` and a main-thread `App::spawn` loop reapplies.
+Linux adapters landed 2026-10-30 (fixture-tested parsers on every OS; payload facts transcribed from the portal spec, plasma's Breeze schemes, omarchy's `bin/omarchy-theme-set`, and libadwaita). The pinned gpui's `AsyncApp` is not `Send`, so watcher threads signal through the shared `source/signal.rs` bridge — an `async_channel` whose drain loop runs on the main thread via `App::spawn` — which the Windows events reuse.
 
 ### 5.4 Accent ramp engine
 
@@ -325,7 +325,7 @@ Dropped from rev 3: D2, D5, D9 (port-era decisions); the review gate returns in
 4. ~~Phase D input~~ ✅ — single-line Input (unit 10) + the §6.2 completion pass (modifiers, undo/redo, read-only, actions + key context, caret blink, paint polish). NumberInput and multiline remain open as deferred units.
 5. ~~Phase E overlays~~ ✅ — Popover (unit 11), ScrollArea (unit 11.5), Menu (unit 12), Tooltip + Dialog/AlertDialog + Toast (unit 11+ row; Sheet dropped). Phase gate held: escape/dismiss semantics and focus behavior per overlay.
 6. ~~Unit 14 — motion, per component (§6 row 14, D21)~~ ✅ Landed in five passes (2026-10-30): (a) theme `reduce_motion` → `cx.set_reduce_motion` in `reapply`; (b) Switch thumb `with_spring`; (c) Toast 8 px slide-in; (d) Dialog scrim enters with the panel; (e) Progress 30 fps cap. Exits and hover washes stay deferred (§6 deferred list).
-7. ~~Phase F, data first~~ ✅ data complete (2026-10-30) — `crates/data` opened with List, then Tree, Tabs, Sidebar (the dead `sheet` feature dropped from core along the way; Table dropped from the roadmap). Also extracted `crates/utils` (2026-10-30): `h_flex`/`v_flex` (core's `common` re-exports them), `focus_handle` (the namespaced keyed handle, 8 call sites), `focus_ring` (7 sites), `adjacent_selectable` + `nav_key` (4 sites), and the selectable-row paint helpers `selectable_label_color`/`paint_selectable_row` (3 sites, reading `&Theme` directly — no intermediate color struct) — `core` and `data` depend on it; the facade doesn't re-export it. **Linux theme sources landed (2026-10-30)**: Omarchy (colors.toml parse + state-dir detection + inotify on `current`), KDE (kdeglobals `[Colors:*]` + AccentColor + `~/.config` inotify), GNOME/generic (portal `ReadAll` + `SettingChanged` via zbus 5 blocking on its own thread, gsettings fallback with the libadwaita accent table) — `SourceKind::Omarchy/Kde/Gnome`, detection cascade Omarchy → KDE → portal → fallback, all parsers fixture-tested on every OS and the Linux build compile-checked via `cargo check --target x86_64-unknown-linux-gnu`. Remaining Phase F: the **Windows source (WinRT `UISettings`)** and the **Segoe Fluent/freedesktop icon resolvers**, slotted in as verification environments allow — with side-by-side gallery screenshots per platform. NumberInput/multiline return as deferred units when needed.
+7. ~~Phase F, data first~~ ✅ data complete (2026-10-30) — `crates/data` opened with List, then Tree, Tabs, Sidebar (the dead `sheet` feature dropped from core along the way; Table dropped from the roadmap). Also extracted `crates/utils` (2026-10-30): `h_flex`/`v_flex` (core's `common` re-exports them), `focus_handle` (the namespaced keyed handle, 8 call sites), `focus_ring` (7 sites), `adjacent_selectable` + `nav_key` (4 sites), and the selectable-row paint helpers `selectable_label_color`/`paint_selectable_row` (3 sites, reading `&Theme` directly — no intermediate color struct) — `core` and `data` depend on it; the facade doesn't re-export it. **Linux theme sources landed (2026-10-30)**: Omarchy (colors.toml parse + state-dir detection + inotify on `current`), KDE (kdeglobals `[Colors:*]` + AccentColor + `~/.config` inotify), GNOME/generic (portal `ReadAll` + `SettingChanged` via zbus 5 blocking on its own thread, gsettings fallback with the libadwaita accent table) — `SourceKind::Omarchy/Kde/Gnome`, detection cascade Omarchy → KDE → portal → fallback, all parsers fixture-tested on every OS and the Linux build compile-checked via `cargo check --target x86_64-unknown-linux-gnu`. **Windows source + icon resolvers landed (2026-10-30)**: `SourceKind::Windows` (WinRT `UISettings` + `Personalize` fallback + `ColorValuesChanged`/`HighContrastChanged`, §5.3), the Segoe Fluent codepoint renderer, and the freedesktop theme walker (§4.4); the WinRT surface was verified against the real `windows` 0.62 bindings via a standalone cross-check (gpui's own manifest build needs llvm-rc from macOS). Remaining Phase F: **side-by-side gallery screenshots per platform** — Omarchy/KDE/GNOME need a Linux run, Windows needs its first hardware build. NumberInput/multiline return as deferred units when needed.
 8. Then — Phase G: pickers, polish, → 0.1; start `crates/editor` if wanted.
 
 Batched polish candidates between units: scrollbar auto-hide + horizontal thumb, `Undo`/`Redo` menu events.