fix(auth): Google Sign-In audience mismatch + remove per-user accent color

Root cause of "Google authentication failed": appsettings.Development.json
had Auth:GoogleClientId set to the literal placeholder
"CHANGE_ME_GOOGLE_CLIENT_ID" while the frontend's .env.development had a
real (already-public, already-committed) client ID -- every Google ID
token's audience check failed against the backend's placeholder. Fixed
by setting the same real client ID on both sides (a client ID is a
public identifier, not a secret, safe to commit -- unlike a client
secret). Also enabled Auth:AllowRegistration in dev so the existing
Google-first self-serve-signup path (auto-create on unmatched verified
email, auto-link on matching verified email -- built during Wave 7) is
actually exercisable locally.

Wired the previously-missing Auth__MicrosoftClientId /
NEXT_PUBLIC_MICROSOFT_CLIENT_ID into docker-compose.yml/.env.example
(distinct from the existing MICROSOFT_CLIENT_ID used for Outlook mail
linking) -- Microsoft sign-in was never deployable, a leftover gap from
when it was built. Fixed a stale env-var name in the Microsoft setup
hint copy (still said REACT_APP_*, predates the Next.js migration).

Removed the per-user accent color picker entirely: it was purely
client-side (localStorage + theme.ts), never touched the backend/DB.
theme.ts now hardcodes a single ACCENT constant; themePrefs.ts drops
get/set/clearAccentColor; App.tsx and SettingsView.tsx drop the
accentColor prop threading. Dead accent-related i18n keys removed from
both locales.

Consolidated Settings' "Account" tab (duplicated GoogleAuthCard, which
already lives on the Profile page) into Profile: moved AuthStatusCard
and EmailProviderConnections there alongside the existing Google/
Microsoft auth cards, so identity/account-linking lives in one place.
Settings drops from 5 tabs to 4 and its General tab uses a consistent
SectionCard layout instead of ad-hoc per-card styling.

Verified: dotnet build/test (177/177) and npm build/test (57/57) both
green; confirmed live against a running dev server that /auth/config
now reports googleEnabled with the corrected client ID, Settings has
no accent controls, and Profile shows the consolidated auth section.

job-tracker-ui/src/i18n/translations.ts

@@ -128,22 +128,17 @@ export const translations = {
     settingsTabGeneral: "General",
     settingsTabFollowUps: "Follow-ups",
     settingsTabNotifications: "Notifications",
-    settingsTabAccount: "Account",
     settingsTabBackup: "Backup",
     settingsAppearance: "Appearance",
     settingsTheme: "Theme",
     settingsThemeSystem: "System",
     settingsThemeDark: "Dark",
     settingsThemeLight: "Light",
-    settingsAccent: "Accent",
-    settingsReset: "Reset",
-    settingsSavedPerUser: "Saved per user on this browser.",
     settingsLanguageTitle: "Language and localization",
     settingsLanguageBody: "Set your preferred app language. This is also the language used when deciding whether imported job descriptions should show translated text.",
     settingsPreferredLanguage: "Preferred language",
     settingsEnglish: "English",
     settingsNorwegian: "Norwegian Bokmål",
-    settingsMorePagesSoon: "More pages will be moved onto this translation system as the UI cleanup continues.",
     settingsJobs: "Jobs",
     settingsPagination: "Pagination",
     settingsRowsPerPage: "Rows per page",
@@ -167,8 +162,6 @@ export const translations = {
     settingsNotificationsFollowUpReminders: "Email reminders for follow-ups",
     settingsNotificationsGhostedJobs: "Email alerts for ghosted jobs",
     settingsNotificationsInAppReminders: "Highlight reminders in the app",
-    settingsAccentHelp: "Drag in the color picker, then save when it looks right.",
-    settingsAccentInvalid: "Use a full hex color like #15803D.",
     settingsCheckSystemStatus: "Check system status",
     profileTitle: "Profile",
     profileHeadlinePlaceholder: "Add a short headline to personalize your account view.",
@@ -629,7 +622,7 @@ export const translations = {
     googleUnlinked: "Google account unlinked.",
     googleUnlinkFailed: "Failed to unlink Google account.",
     microsoftAccountTitle: "Microsoft account",
-    microsoftSetupHint: "Set `REACT_APP_MICROSOFT_CLIENT_ID` in your UI environment to enable Microsoft sign-in and account linking.",
+    microsoftSetupHint: "Set `NEXT_PUBLIC_MICROSOFT_CLIENT_ID` in your UI environment to enable Microsoft sign-in and account linking.",
     microsoftLinked: "Linked",
     microsoftAvailableToLink: "Available to link",
     microsoftLinkedDate: "Linked {date}",
@@ -1093,22 +1086,17 @@ export const translations = {
     settingsTabGeneral: "Generelt",
     settingsTabFollowUps: "Oppfølging",
     settingsTabNotifications: "Varsler",
-    settingsTabAccount: "Konto",
     settingsTabBackup: "Sikkerhetskopi",
     settingsAppearance: "Utseende",
     settingsTheme: "Tema",
     settingsThemeSystem: "System",
     settingsThemeDark: "Mørkt",
     settingsThemeLight: "Lyst",
-    settingsAccent: "Aksent",
-    settingsReset: "Tilbakestill",
-    settingsSavedPerUser: "Lagres per bruker i denne nettleseren.",
     settingsLanguageTitle: "Språk og lokalisering",
     settingsLanguageBody: "Velg foretrukket språk i appen. Dette brukes også når appen avgjør om importerte stillingsbeskrivelser skal vise oversatt tekst.",
     settingsPreferredLanguage: "Foretrukket språk",
     settingsEnglish: "Engelsk",
     settingsNorwegian: "Norsk Bokmål",
-    settingsMorePagesSoon: "Flere sider flyttes til dette oversettelsessystemet etter hvert som UI-oppryddingen fortsetter.",
     settingsJobs: "Jobber",
     settingsPagination: "Paginering",
     settingsRowsPerPage: "Rader per side",
@@ -1132,8 +1120,6 @@ export const translations = {
     settingsNotificationsFollowUpReminders: "E-postpåminnelser for oppfølginger",
     settingsNotificationsGhostedJobs: "E-postvarsler for ghostede jobber",
     settingsNotificationsInAppReminders: "Fremhev påminnelser i appen",
-    settingsAccentHelp: "Dra i fargevelgeren, og lagre når den ser riktig ut.",
-    settingsAccentInvalid: "Bruk en full hex-farge som #15803D.",
     settingsCheckSystemStatus: "Sjekk systemstatus",
     profileTitle: "Profil",
     profileHeadlinePlaceholder: "Legg til en kort overskrift for å gjøre kontovisningen mer personlig.",
@@ -1594,7 +1580,7 @@ export const translations = {
     googleUnlinked: "Google-konto koblet fra.",
     googleUnlinkFailed: "Kunne ikke koble fra Google-kontoen.",
     microsoftAccountTitle: "Microsoft-konto",
-    microsoftSetupHint: "Sett `REACT_APP_MICROSOFT_CLIENT_ID` i UI-miljøet ditt for å aktivere Microsoft-innlogging og kontokobling.",
+    microsoftSetupHint: "Sett `NEXT_PUBLIC_MICROSOFT_CLIENT_ID` i UI-miljøet ditt for å aktivere Microsoft-innlogging og kontokobling.",
     microsoftLinked: "Koblet",
     microsoftAvailableToLink: "Tilgjengelig for kobling",
     microsoftLinkedDate: "Koblet {date}",