feat: Make output more user friendly with emojis and cleaner format

[konard]

Summary

Makes the CLI output more user friendly by:

• Reducing duplications - File size and URL were shown multiple times, now shown once
• Adding colorful emojis for visual clarity of success/failure:
  • ⏳ Uploading
  • ✅ Success
  • 🔍 Dry run
  • 🔒 Private
  • 🌐 Public
  • 🔗 URL
• Shorter output - Moved verbose details (strategy, mode, file name) to --verbose mode only
• Essential info preserved - Size, visibility, and URL are still shown

Before (verbose, duplicated)

File: /path/to/log.log
Size: 1.89 KB

Uploading...

File size: 1.89 KB
Strategy: File fits within GitHub Gist limit (100MB)
Mode: Auto (automatic strategy selection)
Creating GitHub Gist for /path/to/log.log
✓ Created secret gist log.log
https://gist.github.com/user/abc123
Gist created successfully: https://gist.github.com/user/abc123

✓ Upload complete!

Type: GitHub Gist
Visibility: private
File name: path-to-log.log

URL: https://gist.github.com/user/abc123

After (clean, minimal)

⏳ Uploading 1.89 KB (🔒 private)...
✅ Gist created (🔒 private)
🔗 https://gist.github.com/user/abc123

Test plan

• All 37 tests pass locally
• Lint and format checks pass
• Dry mode output is correct
• Verbose mode still shows full details
• CI passes

Fixes #15

🤖 Generated with Claude Code

[konard]

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💰 Cost estimation:

• Public pricing estimate: $5.017463 USD
• Calculated by Anthropic: $3.268776 USD
• Difference: $-1.748687 (-34.85%)
  📎 Log file uploaded as GitHub Gist (644KB)
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