chore(settings): remove unused Google Maps API Key field

The General Settings preferences audit revealed no UI map code reads
settings.google_maps_api_key -- it was a dead preference being collected
from users with no consumer. Remove the form field, type field, search
index entry, and i18n strings so the UI stops misleading users that
entering a key does anything.

Backend env-var fallback (internal/config, helm, docker-compose,
.env.example) is preserved for when maps are properly implemented later
as a reusable component that actually consumes the key.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: atulmgupta

web/src/api/types.ts

@@ -248,7 +248,6 @@ export interface AppSettings {
   quiet_hours_start: string
   quiet_hours_end: string
   alert_digest_mode: string
-  google_maps_api_key?: string
   polling_config?: PollingConfig
   /** Unicode currency glyph (e.g. "$", "€"). Stored verbatim — no ISO 4217 lookup. */
   currency_symbol?: string

web/src/features/settings/components/GeneralSettings.tsx

@@ -74,10 +74,9 @@ export function GeneralSettings() {
   const settingsMut = useSaveSettings()
 
   // Persist form drafts to localStorage so a long edit session survives a tab
-  // close, an SW reload, or an auth redirect. The optional google_maps_api_key
-  // field is a client-side public-tier integration key (comparable to the theme
-  // setting) — not a server credential. If a true secret is ever added to this
-  // form, switch that field to a separate non-persisted useState.
+  // close, an SW reload, or an auth redirect. None of the persisted fields are
+  // server credentials — keep it that way; if a true secret is ever added to
+  // this form, switch that field to a separate non-persisted useState.
   const {
     value: form,
     setValue: setForm,
@@ -389,21 +388,6 @@ export function GeneralSettings() {
                   placeholder={t('app.mpgPlaceholder', 'Average MPG of equivalent gas car')}
                 />
               </SettingField>
-
-              <SettingField label={t('app.googleMapsApiKey', 'Google Maps API Key')}>
-                <Input
-                  type="password"
-                  value={form.google_maps_api_key || ''}
-                  onChange={e => setForm({ ...form, google_maps_api_key: e.target.value })}
-                  className="w-full px-3 py-2.5 text-sm"
-                  placeholder={t('app.googleMapsPlaceholder', 'Enter your Google Maps API key')}
-                />
-                <p className="text-[10px] text-[var(--text-muted)] mt-1">
-                  {t('app.googleMapsHint', 'Optional — enables satellite views, Places autocomplete, and enhanced geocoding.')}{' '}
-                  {t('app.getKeyAt', 'Get a key at')}{' '}
-                  <a href="https://console.cloud.google.com" target="_blank" rel="noreferrer" className="text-cyan-300 hover:underline">console.cloud.google.com</a>
-                </p>
-              </SettingField>
             </div>
           </>
         )}

web/src/features/settings/searchIndex.ts

@@ -201,14 +201,6 @@ export function getSettingsIndex(t: TFunction): SettingsEntry[] {
       description: t('search.entries.general.mpg.desc', 'Average MPG of the equivalent gas car for savings calculations.'),
       keywords: ['fuel economy', 'efficiency', 'mpg'],
     },
-    {
-      id: 'general.google-maps',
-      href: '/settings#general',
-      section: 'general',
-      title: t('search.entries.general.googleMaps.title', 'Google Maps API key'),
-      description: t('search.entries.general.googleMaps.desc', 'Optional key enabling satellite views and Places autocomplete.'),
-      keywords: ['maps', 'api key', 'satellite', 'places'],
-    },
 
     // ── Gas price auto-poll ─────────────────────────────────────────
     {

web/src/i18n/en.json

@@ -1844,10 +1844,6 @@
         "mpg": {
           "title": "Comparison vehicle MPG",
           "desc": "Average MPG of the equivalent gas car for savings calculations."
-        },
-        "googleMaps": {
-          "title": "Google Maps API key",
-          "desc": "Optional key enabling satellite views and Places autocomplete."
         }
       },
       "gasPrice": {
@@ -6726,10 +6722,6 @@
     "perLiter": "/ liter",
     "comparisonMPG": "Comparison Vehicle MPG",
     "mpgPlaceholder": "Average MPG of equivalent gas car",
-    "googleMapsApiKey": "Google Maps API Key",
-    "googleMapsPlaceholder": "Enter your Google Maps API key",
-    "googleMapsHint": "Optional — enables satellite views, Places autocomplete, and enhanced geocoding.",
-    "getKeyAt": "Get a key at",
     "save": "Save Settings",
     "settingsSaved": "Settings saved",
     "newVersion": {