Convert British spellings to American across the repo

colour -> color, behaviour -> behavior, centre -> center, favourite ->
favorite, and about twenty other pairs, applied consistently across
comments, docs, error/UI copy, and a handful of QML identifiers that
used the British spelling as their actual name: SystemSettings'
serialiseValue/serialiseTable/normaliseGradient, Displays'
normaliseModes, Wallpaper's normalisePolicy, SettingsBackup's
serialiseHomeState, DateTime's ntpSynchronised property, Clipboard's
_normalise helper, and ShortcutCapture's cancelled signal (with its
onCancelled handler in ShortcutsPage.qml). Every call site and the two
tests that assert on the literal source text (settings-ownership and
settings-backup-live contracts) were updated in lockstep.

Left untouched: config/dot/espanso/match/packages/misspell-en/ is a
vendored third-party autocorrect dictionary -- its entries are typo
corrections, not our prose, and rewriting them would fight the
package's own purpose (and any future re-sync from upstream).

The already-American `favorites` property (Home page pinned
accessories) was never actually misspelled -- only nearby comments and
error strings said "favourites" -- so no data migration was needed
there.

Claude-Session: https://claude.ai/code/session_01E6TJUAh41HaP25MVHWkhRZ

config/dot/hypr/README.md

@@ -30,7 +30,7 @@ Don't "fix" them.
 | `prefs.lua` | Reads the settings file the Settings app writes. See below |
 | `env.lua` | Environment. Note the uwsm caveat below |
 | `monitors.lua` | DP-2 geometry, scaling, and the HDR decision |
-| `looks.lua` | Colours, blur, glow, shadows, animations, VRR, scanout |
+| `looks.lua` | Colors, blur, glow, shadows, animations, VRR, scanout |
 | `input.lua` | Keyboard/mouse. Click-to-focus, like GNOME |
 | `rules.lua` | Window rules, gaming rules, layer rules for the shell |
 | `keybinds.lua` | The full keymap |
@@ -87,7 +87,7 @@ persistence, validation, reset, and the live write are all derived from that
 entry.
 
 `prefs.lua` never raises. A missing, empty, truncated, malformed, or
-wrong-typed settings file costs you your customisations and nothing else;
+wrong-typed settings file costs you your customizations and nothing else;
 `tests/hypr/prefs-fallback-contract.sh` pins that, including that Hyprland still
 accepts the config in each of those states.
 
@@ -163,7 +163,7 @@ four places, and nowhere else —
    dock, popovers), running blue on the left to orchid on the right and fading
    out before the corners. See `quickshell/widgets/PrismEdge.qml`.
 2. The focused window's border — `general.col.active_border`, blue→orchid at
-   115°. Unfocused windows get no colour at all, because the gradient only
+   115°. Unfocused windows get no color at all, because the gradient only
    means something if one window on screen is wearing it.
 3. The active workspace pill in the bar.
 4. Slider fills.
@@ -179,9 +179,9 @@ which is the opposite of the intent.
 
 The Nerd Font is still used, but only to draw **icon glyphs** — it is the
 pragmatic alternative to freedesktop symbolic icons, which ship with a
-hardcoded `#2e3436` fill that Qt (unlike GTK) will not recolour. Where a
+hardcoded `#2e3436` fill that Qt (unlike GTK) will not recolor. Where a
 themed freedesktop icon is wanted instead, `quickshell/widgets/ThemedIcon.qml`
-paints a palette colour through the icon's alpha.
+paints a palette color through the icon's alpha.
 
 Anything whose digits change in place — the clock, the vitals percentages, the
 recording timer, the selection readout — sets `font.features:
@@ -256,7 +256,7 @@ The mental model is unchanged from Forge:
 | `SUPER + CTRL + G` / `Z` / `V` | Toggle split / preselect right / preselect down |
 | `SUPER + Tab` / `SHIFT + Tab` | Cycle windows |
 | `SUPER + SHIFT + grave` | Last window |
-| `SUPER + X` / `SUPER + SHIFT + X` | Restore scratchpad / minimise to scratchpad |
+| `SUPER + X` / `SUPER + SHIFT + X` | Restore scratchpad / minimize to scratchpad |
 
 ### Workspaces (dynamic, like GNOME)
 | Key | Action |
@@ -270,19 +270,19 @@ The mental model is unchanged from Forge:
 ### Launcher and shell
 | Key | Action |
 |---|---|
-| `SUPER + A` / `R` / `Space` | Launcher (vicinae) — all three, pick your favourite |
+| `SUPER + A` / `R` / `Space` | Launcher (vicinae) — all three, pick your favorite |
 | `SUPER + SHIFT + R` | Fallback launcher (wofi) if the shell is broken |
 | `SUPER + V` | Clipboard history |
 | `SUPER + .` | Emoji picker |
 | `SUPER + S` | Quick settings |
 | `SUPER + I` | Settings |
 | `SUPER + SHIFT + F` | Start or reveal focus session |
-| `SUPER + B` | Notification centre |
+| `SUPER + B` | Notification center |
 | `SUPER + grave` | Workspace overview |
 | `Print` | Screenshot / record picker |
 | `SHIFT` / `ALT + Print` | Screenshot screen / window immediately |
 | `SUPER + SHIFT + S` | Screen Intelligence — read text and codes from a selection |
-| `SUPER + SHIFT + P` | Colour picker |
+| `SUPER + SHIFT + P` | Color picker |
 | `CTRL + ALT + L` | Lock (SUPER+L is "focus right") |
 | `CTRL + ALT + Delete` | Power menu |
 
@@ -325,8 +325,8 @@ Caffeine, Night Light, Focus, audio input/output, user, settings, and power in
 one place. Home and Phone continue the same surface rather than opening extra
 dashboard windows.
 
-Home shows the first four selected favourites at rest and every selected light
-when expanded. Use **Settings → Home & Phone** to choose favourites,
+Home shows the first four selected favorites at rest and every selected light
+when expanded. Use **Settings → Home & Phone** to choose favorites,
 set Panama-only aliases, and arrange their order. Dragging a brightness control
 only previews the value; releasing it sends one brightness request. A normal
 power toggle leaves Home Assistant responsible for restoring its previous
@@ -334,7 +334,7 @@ level.
 
 Credentials stay private in the gitignored `config/bash/env` file, with the
 existing GNOME extension and Secret Service setup retained as a compatibility
-fallback. Favourites, aliases, and order live in Quickshell state. No shell
+fallback. Favorites, aliases, and order live in Quickshell state. No shell
 restart is required after changing credentials; close and reopen Control Center
 to refresh. If Home Assistant is offline, the last known values stay visible
 with a stale-state label and Retry action.
@@ -361,7 +361,7 @@ These are the places a 1:1 port was impossible, and what was done instead:
 
 - **Per-edge resize.** Forge resized one named edge; Hyprland resizes along an
   axis and lets the layout pick the edge. The eight Forge keys collapse to four
-  behaviours, keeping the horizontal/vertical and grow/shrink pairing.
+  behaviors, keeping the horizontal/vertical and grow/shrink pairing.
 - **Overview on `SUPER + grave`, not a bare SUPER tap.** Tap-detection on a
   modifier misfires when you're quick with SUPER combos.
 - **Lock on `CTRL + ALT + L`.** `SUPER + L` is "focus right" in this keymap.