fix(window): add in-page close button on Hyprland

[Youpen-y]

Fixes #6

Summary

On wlroots Wayland compositors the review window is a layer-shell Overlay with no title bar, so it has no way to be closed. Detect Hyprland in the bridge (tested) and reveal an in-page × button that calls glimpse's existing close API.

Problem

On wlroots-based Wayland compositors (tested on Hyprland; Sway/River theoretically affected) the review window cannot be closed by the user:

• No title-bar × button — the window has no decorations
• super+Q / Alt+F4 / Esc don't work — it isn't a regular toplevel, so compositor window actions (killactive, closewindow) don't apply
• The escape is killing the glimpse process or reloading the extension or ending the pi session

Root cause

glimpse's native Linux backend renders the window as a layer-shell Overlay surface via gtk4-layer-shell:

// glimpseui src/linux/src/main.rs:115-117
window.init_layer_shell();
window.set_layer(Layer::Overlay);
window.set_exclusive_zone(-1);

layer-shell surfaces carry no window decorations (no title bar, no ×) and aren't managed as regular toplevels by the compositor. and glimpse does expose a close API (window.glimpse.close() → __glimpse_close → app.quit() at main.rs:218), but review-loop never calls it: there's no close button in the UI and no keyboard binding.

This only affects wlroots compositors. On macOS / Windows / X11 / GNOME-Wayland, gtk4-layer-shell falls back to a normal decorated toplevel (those compositors don't implement wlr-layer-shell), so the system × button is present.

Solution

Detect Hyprland in the bridge (Node side, where process.env is directly readable via HYPRLAND_INSTANCE_SIGNATURE) and inject a flag into the page HTML. The web app renders an in-page × button only when the flag is set, and wires it to glimpse's existing window.glimpse.close().

Solution

Detect Hyprland in the bridge (Node side, where process.env is directly readable via HYPRLAND_INSTANCE_SIGNATURE) and inject a flag into the page HTML. The web app renders an in-page × button only when the flag is set, and wires it to glimpse's existing window.glimpse.close().

Limitations / future work

• Detection currently covers only Hyprland (tested). Other wlroots
  compositors (Sway → SWAYSOCK, River, …) are theoretically affected (layer-shell has no decorations) but unverified, add their env vars once confirmed.