feat(MiniCalendarWidget): enhance localization and refactor calendar logic

- Updated the MiniCalendarWidget to utilize localized strings for month names, weekdays, and loading messages, improving user experience across multiple languages.
- Refactored the calendar logic to use constants for month keys and weekday order, ensuring consistency with backend configurations.
- Added new translation entries for the mini widget in Cebuano, German, English, Spanish, and French, enhancing accessibility for users.

frontend/src/i18n/locales/en/personal.json

@@ -49,6 +49,10 @@
                 "nov": "November",
                 "dec": "December"
             },
+            "miniWidget": {
+                "loading": "Loading calendar…",
+                "linkToCalendar": "Go to calendar →"
+            },
             "categories": {
                 "personal": "Personal",
                 "work": "Work",

frontend/src/i18n/locales/en/settings.json

@@ -198,9 +198,16 @@
             "linkSignup": "Create an OpenAI account (new tab)",
             "linkApiKeys": "Manage OpenAI API keys (new tab)",
             "enabled": "Allow use for language features",
+            "presetsTitle": "Quick start (1-click)",
+            "presetOllama": "Free local (Ollama)",
+            "presetOpenAi": "Default (OpenAI-compatible)",
+            "presetHintBefore": "The Ollama preset sets ",
+            "presetHintBetween": " and ",
+            "presetHintAfter": ". No API key required.",
             "baseUrl": "API base URL (optional)",
             "baseUrlPlaceholder": "Empty = default (OpenAI). For Ollama e.g. http://127.0.0.1:11434/v1",
             "model": "Model name",
+            "modelPlaceholder": "gpt-4o-mini",
             "apiKey": "API key",
             "apiKeyHint": "Leave empty to keep the stored key.",
             "apiKeyPlaceholderNew": "Paste new key",