feat: add keybind cheatsheet plugin (#64)

* feat: add keybind cheatsheet

* docs: refresh keybind cheatsheet preview

* docs: use official generated keybind thumbnail

* feat(keybind-cheatsheet): preload cached snapshots

Move parser and cache ownership into an event-driven data service so the panel opens from a prepared last-known-good snapshot. Document the plugin's inspiration and independent v5 implementation.

keybind-cheatsheet/tests/fixtures/hypr/binds.json

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+[
+  {"locked":false,"mouse":false,"release":false,"repeat":false,"has_description":true,"modmask":64,"submap":"","key":"T","keycode":0,"description":"Terminal","dispatcher":"exec","arg":"foot"},
+  {"locked":false,"mouse":false,"release":false,"repeat":false,"has_description":true,"modmask":64,"submap":"","key":"1","keycode":0,"description":"Workspace 1","dispatcher":"workspace","arg":"1"},
+  {"locked":false,"mouse":false,"release":false,"repeat":false,"has_description":true,"modmask":0,"submap":"","key":"XF86AudioMute","keycode":0,"description":"Mute","dispatcher":"exec","arg":"wpctl set-mute @DEFAULT_AUDIO_SINK@ toggle"},
+  {"locked":false,"mouse":false,"release":false,"repeat":false,"has_description":false,"modmask":64,"submap":"","key":"Q","keycode":0,"description":"","dispatcher":"killactive","arg":""}
+]

keybind-cheatsheet/tests/fixtures/hypr/hyprland.conf

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+$mainMod = SUPER
+source = ./parts/*.conf
+
+# 1. Applications
+bind = $mainMod, T, exec, foot #"Terminal"
+bindm = $mainMod, mouse:272, movewindow #"Move window"
+
+# 2. Window Management
+bind = $mainMod SHIFT, Q, killactive, #"Close window"

keybind-cheatsheet/tests/fixtures/hypr/hyprland.lua

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+-- 1. Applications
+Hyprland.config.bind("SUPER, T", launch_terminal, { description = "Terminal" })
+
+-- 2. Workspaces
+for i = 1, 9 do
+  Hyprland.config.bind("SUPER, " .. i, workspace, { description = "Workspace " .. i })
+end
+
+require("parts.media")

keybind-cheatsheet/tests/fixtures/hypr/parts/media.lua

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+-- 3. Media
+Hyprland.config.bind(", XF86AudioMute", mute, { desc = "Mute" })

keybind-cheatsheet/tests/fixtures/hypr/parts/workspaces.conf

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+# 3. Workspaces
+binde = $mainMod, 1, workspace, 1 #"Workspace 1"
+bind = , XF86AudioMute, exec, wpctl set-mute @DEFAULT_AUDIO_SINK@ toggle