chore: reduce component overhead (#3)

Reviewed-on: #3

crates/theme/src/lib.rs

@@ -23,9 +23,39 @@ pub use system::{AccessibilityPreferences, PartialPalette, SourceKind, SystemThe
 use gpui::{App, Global, Hsla, Pixels, WindowAppearance, WindowBackgroundAppearance, px};
 use std::time::Duration;
 
-/// The hairline width of the control border every button and field paints;
-/// sized outside the stated metrics so control sizes match across platforms.
+/// The hairline width of the control border every button and field paints.
 pub const BORDER_WIDTH: Pixels = px(1.0);
+/// The tallest an anchored popup's list may grow.
+pub const POPUP_MAX_HEIGHT: Pixels = px(320.0);
+/// The widest a tooltip may grow.
+pub const TOOLTIP_MAX_WIDTH: Pixels = px(360.0);
+/// How far a tooltip sits from the pointer.
+pub const TOOLTIP_OFFSET: Pixels = px(1.0);
+/// The caret's thickness.
+pub const CARET_WIDTH: Pixels = px(1.5);
+/// The IME preedit underline's thickness.
+pub const UNDERLINE_WIDTH: Pixels = px(1.0);
+/// How far one wheel line scrolls, as a multiple of the line height.
+pub const WHEEL_LINE_HEIGHT: f32 = 20.0;
+/// How far one keyboard arrow step moves a resize seam.
+pub const RESIZE_KEYBOARD_STEP: Pixels = px(32.0);
+/// The inset around a window's edge that starts a resize gesture.
+pub const WINDOW_RESIZE_INSET: Pixels = px(4.0);
+/// The pad macOS reserves for its traffic lights at a strip's leading edge.
+pub const TRAFFIC_LIGHT_PAD: Pixels = px(78.0);
+/// The width of a Windows caption button.
+pub const WINDOWS_CAPTION_WIDTH: Pixels = px(36.0);
+/// Windows paints its caption close-button hover red in every theme.
+pub const WINDOWS_CLOSE_HOVER_HEX: u32 = 0xE81120FF;
+/// The monospace advance estimate as a share of the text size.
+pub const MONO_ADVANCE_RATIO: f32 = 0.62;
+/// How much a pixel avatar's tint washes over its background.
+pub const PIXEL_AVATAR_TINT_ALPHA: f32 = 0.16;
+/// Pixel avatar cell lightness multipliers.
+pub const PIXEL_AVATAR_LIGHT_LIFT: f32 = 1.6;
+pub const PIXEL_AVATAR_LIGHT_CAP: f32 = 0.95;
+pub const PIXEL_AVATAR_DARK_FACTOR: f32 = 0.45;
+pub const PIXEL_AVATAR_DARK_FLOOR: f32 = 0.18;
 
 /// Light or dark, resolved from the system appearance.
 #[derive(Clone, Copy, Debug, Default, PartialEq, Eq, serde::Deserialize)]