migrate hints system to a localized markdown-based architecture and refactor related UI components

app/src/main/assets/hints/import_hint.md

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+# Import Vocabulary with AI
+
+Generate vocabulary lists automatically using AI assistance.
+
+## Getting Started
+
+Use AI to quickly create vocabulary lists from your learning goals.
+
+## Step-by-Step Guide
+
+### Step 1: Enter Search Term
+
+Type a topic, theme, or concept for your vocabulary list:
+- Be specific for better results
+- Example: "German food and restaurant phrases"
+- Example: "Business vocabulary for meetings"
+
+### Step 2: Select Languages
+
+Choose source and target languages:
+- **Source language** - The language you're learning from
+- **Target language** - Your native language
+
+### Step 3: Set Amount
+
+Choose how many words to generate:
+- Slide to select 1-25 words
+- More words = longer processing time
+- Start small for your first import
+
+### Step 4: Generate
+
+Tap the generate button:
+- AI creates the vocabulary list
+- Review each entry before saving
+- Edit any translations if needed
+
+## After Generation
+
+Once generated, you can:
+
+- **Review** - Check each word-translation pair
+- **Edit** - Correct any mistakes
+- **Delete** - Remove unwanted entries
+- **Import All** - Add all to your vocabulary
+
+## Tips
+
+> **Pro Tip:** Start with 10 words per import to get familiar with the feature.
+
+---
+
+*Need help? Check our vocabulary management guide.*