Config at ~/.config/srd; cursor shapes, key repeat, pin, mouse defaults

Config path drops a level: ~/.config/srd, not ~/.config/srdwm/srd, which
said the same thing twice. No other user-facing path had the same problem --
srdwm reads the config dir and writes nothing else.

Cursor shapes. A client's own cursor surface is now rendered with the
hotspot it declared, so an I-beam over text or a hand over a link shows the
app's image instead of srdwm's arrow. The built-in arrow stays as the
fallback when no client has set one, over decorations and the desktop.
Named shapes still fall back to the arrow; most toolkits set a surface.
Decorations and cursors now share one OverlayElement type, since
render_output takes a single custom-element slice.

Key repeat (srd.bind_repeat, Hyprland's binde). Held volume, brightness and
switcher keys repeat at the seat's own rate rather than firing once. Driven
from the poll loop, not a timer source: the winit backend has no calloop
loop of its own, and poll_events already runs continuously in both backends.
Repeat stops when *that* key is released, not when any key is.

Always-on-top / pin, for the picture-in-picture and HUD rules that used it.
Window::always_on_top was another declared-but-never-read field. Enforced in
WindowManager's stacking order rather than at render time, so every consumer
of stacking_order gets it and none can forget to honour it.

Mouse-only window management, checked end to end: drag the titlebar to move,
drag any edge or corner to resize, titlebar buttons to close/maximise/
minimise, click to focus, drag to a screen edge to snap, and now
double-click the titlebar to maximise. The resize grab band went from 6px to
10px - a hairline is genuinely hard to hit with a mouse, which is why
Hyprland ships extend_border_grab_area.

Also removed the emoji status markers from docs/IMPLEMENTATION_STATUS.md.

1 files changed, 9 insertions, 2 deletions

diff --git a/crates/core/src/window.rs b/crates/core/src/window.rs
index 3970b02..9484709 100644
--- a/crates/core/src/window.rs
+++ b/crates/core/src/window.rs
@@ -50,8 +50,15 @@ impl Window {
 /// The height, in pixels, of the drawn title bar. Shared between backends so
 /// hit-testing and rendering agree on the same band.
 pub const TITLEBAR_HEIGHT: u32 = 30;
-/// Width of a resize grab margin along each window edge.
-pub const RESIZE_MARGIN: i32 = 6;
+/// Width of the resize grab band along each window edge.
+///
+/// 10px rather than a hairline: this is grabbed with a mouse, and a border
+/// only a couple of pixels wide is genuinely hard to hit - which is why
+/// Hyprland ships `extend_border_grab_area` and why every desktop widens
+/// this beyond the visible border. The band is inside the window, so it
+/// costs a few pixels of client edge; that is the right trade for making
+/// resize reliably grabbable without a keyboard.
+pub const RESIZE_MARGIN: i32 = 10;
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub enum ResizeEdge {