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/plans/2026-08-17-panama-control-center.md

@@ -2,7 +2,7 @@
 
 > **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
 
-**Goal:** Expand Panama Quick Settings into the approved Control Center with secure Home Assistant favourites and capability-aware iPhone continuity.
+**Goal:** Expand Panama Quick Settings into the approved Control Center with secure Home Assistant favorites and capability-aware iPhone continuity.
 
 **Architecture:** Two executable Python helpers own the external boundaries: KDE Connect CLI/D-Bus and the Home Assistant REST API/credential lookup. Quickshell singletons normalize those JSON contracts for focused Home and Phone components inside the existing Quick Settings window; Ongoing and Signal Glass consume transfer lifecycle without duplicating state.
 
@@ -17,7 +17,7 @@
 - Only one of Wi-Fi, Bluetooth, sink, source, Home, and Phone may be expanded at once.
 - Never print Home Assistant tokens, Authorization headers, clipboard text, certificate fingerprints, IP addresses, response bodies, or full local file paths.
 - Home Assistant tokens remain in the gitignored environment file or Secret Service; never write one into tracked content.
-- Home Assistant toggle commands accept only entity IDs from the configured favourites snapshot.
+- Home Assistant toggle commands accept only entity IDs from the configured favorites snapshot.
 - KDE Connect actions derive from advertised plugins; no fake battery or remote-input control is allowed.
 - Every Home toggle, file chooser, file send, clipboard send, and Ring action requires a user click.
 - Home toggle success, phone Ring, and clipboard success remain globally quiet.
@@ -49,8 +49,8 @@
 - `config/dot/quickshell/modules/quicksettings/QuickSettings.qml` — tighter top attachment and service preparation.
 - `config/dot/quickshell/modules/quicksettings/QuickSettingsPanel.qml` — expanded composition and exclusive section routing.
 - `config/dot/quickshell/modules/quicksettings/ControlSectionHeader.qml` — quiet section label and optional trailing action.
-- `config/dot/quickshell/modules/quicksettings/HomeControls.qml` — four favourites, expanded configured list, loading/stale/failure states.
-- `config/dot/quickshell/modules/quicksettings/HomeTile.qml` — one domain-aware favourite tile.
+- `config/dot/quickshell/modules/quicksettings/HomeControls.qml` — four favorites, expanded configured list, loading/stale/failure states.
+- `config/dot/quickshell/modules/quicksettings/HomeTile.qml` — one domain-aware favorite tile.
 - `config/dot/quickshell/modules/quicksettings/PhoneControls.qml` — approved compact Continuity Card.
 - `config/dot/quickshell/modules/quicksettings/RecentExchange.qml` — one session-local completed transfer row.
 - `config/dot/quickshell/modules/bar/StatusCluster.qml` — reachable-phone glyph inside the existing click target.
@@ -340,7 +340,7 @@ Expected: all tests PASS and the fake server records no unexpected route.
 - [ ] **Step 5: Add and run the redacted live contract**
 
 The contract runs `probe` and `snapshot`, validates the schema, and prints only
-`PASS (configured=true, N favourites; contents redacted)`. It must pipe JSON to
+`PASS (configured=true, N favorites; contents redacted)`. It must pipe JSON to
 `jq` without printing friendly names, entity IDs, URL, or raw errors.
 
 - [ ] **Step 6: Commit Task 2**
@@ -599,7 +599,7 @@ git commit -m "Build the Panama Control Center"
 
 - [ ] **Step 1: Update desktop documentation**
 
-Mark Home Assistant favourites and KDE Connect phone integration Live. Document
+Mark Home Assistant favorites and KDE Connect phone integration Live. Document
 the 430-pixel Control Center, two-pixel bar attachment, environment/keyring
 configuration precedence, BlueBubbles messaging boundary, and current iOS
 capabilities. Remove those two items from `System UI still worth adding` while
@@ -628,7 +628,7 @@ inspect only the new process's journal for QML errors or warnings.
 - [ ] **Step 4: Perform read-only live checks**
 
 Verify the Control Center reports one reachable phone with the confirmed action
-names and seven configured Home favourites without printing identities. Open
+names and seven configured Home favorites without printing identities. Open
 and close the panel, expand Home and Phone, and confirm Wi-Fi, Bluetooth, audio,
 Focus, Caffeine, Night Light, settings, power, Escape, and outside-click remain
 usable. Do not trigger an external-device action.