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

docs/superpowers/specs/2026-08-17-panama-control-center-design.md

@@ -4,7 +4,7 @@
 
 Panama will expand the existing top-right Quick Settings popover into a complete
 Control Center. Wi-Fi, Bluetooth, Focus, Caffeine, Night Light, audio, account,
-settings, and power remain in place. Home Assistant favourites and lightweight
+settings, and power remain in place. Home Assistant favorites and lightweight
 iPhone continuity join that same surface instead of creating separate windows
 or permanent bar widgets.
 
@@ -18,7 +18,7 @@ the paired iPhone exposes only a useful subset of KDE Connect.
 
 - Make the top-right popover feel like a complete desktop Control Center rather
   than a small collection of connectivity toggles.
-- Toggle the existing Home Assistant favourites without opening a browser.
+- Toggle the existing Home Assistant favorites without opening a browser.
 - Preserve the user's seven enabled Home Assistant lights and use Home
   Assistant friendly names and live states.
 - Show the paired iPhone's real reachability and expose Send File, Send
@@ -67,7 +67,7 @@ The resting panel is ordered by frequency and scope:
 
 1. Wi-Fi, Bluetooth, Caffeine, and Night Light toggle grid.
 2. Focus and audio controls.
-3. Home favourites.
+3. Home favorites.
 4. Phone continuity.
 5. User, Panama Settings, and power footer.
 
@@ -83,7 +83,7 @@ panel remains predictable.
 
 ## Home section
 
-The resting Home card shows the first four enabled favourites in their saved
+The resting Home card shows the first four enabled favorites in their saved
 order. Each tile contains a domain-appropriate glyph, a friendly name, and a
 plain state such as `On`, `Off`, or `Unavailable`. Enabled lights use a quiet
 amber light treatment; Panama blue remains reserved for desktop selection and
@@ -96,7 +96,7 @@ without a toast or Signal Glass event. A failure restores the last known state
 and displays a concise inline error inside the Home section.
 
 The trailing `N accessories` action expands a full list of configured
-favourites inside the Control Center. No unconfigured Home Assistant entity is
+favorites inside the Control Center. No unconfigured Home Assistant entity is
 shown. An `Open Home Assistant` action launches the configured base URL.
 
 If Home Assistant is unreachable, Panama retains the last good states for the
@@ -165,7 +165,7 @@ reliable byte progress for this device.
 Add `scripts/panama-home-assistant`, a small local bridge with four commands:
 
 - `probe` reports configuration and API availability without entity details;
-- `snapshot` returns only configured favourites and normalized state;
+- `snapshot` returns only configured favorites and normalized state;
 - `toggle ENTITY_ID` calls the Home Assistant service for an allow-listed
   configured entity; and
 - `open` launches the configured Home Assistant URL.
@@ -212,7 +212,7 @@ outside-click behavior remain intact.
 - Helpers never echo tokens, Authorization headers, clipboard text, entity
   response bodies, IP addresses, or full local file paths to logs.
 - Home Assistant commands accept only entity IDs present in the configured
-  favourites snapshot.
+  favorites snapshot.
 - KDE Connect device IDs and file paths are passed as separate process
   arguments, never interpolated into a shell command.
 - A user click is required for every Home toggle, phone ring, clipboard send,
@@ -231,7 +231,7 @@ outside-click behavior remain intact.
   is offered.
 - Invalid or expired token: Home shows `Authentication required` without
   exposing the response body.
-- One malformed entity is omitted without suppressing healthy favourites.
+- One malformed entity is omitted without suppressing healthy favorites.
 
 ## Testing and verification
 
@@ -261,7 +261,7 @@ checks require an explicit user action from the finished Control Center.
 
 ## Documentation updates
 
-- Update `config/dot/hypr/DESKTOP-PARITY.md` to mark Home Assistant favourites
+- Update `config/dot/hypr/DESKTOP-PARITY.md` to mark Home Assistant favorites
   and KDE Connect phone integration live.
 - Document Control Center behavior, credential resolution, and iOS limitations
   in `config/dot/hypr/README.md`.