fix(ui): update placeholder text in ArrInstanceForm based on instance type

[pashioya]

Tiny starter pr for something thats annoyed me for a while now.
Replaces "My Sonarr" helper text with a variable text depending on selected instance type
Also uses default interface for sonarr and radarr respectively

Summary by CodeRabbit

• New Features
  • Form field placeholders now dynamically update based on the selected instance type, with type-specific names and default port numbers to provide clearer guidance when configuring your instances.

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[coderabbitai]

Walkthrough

The ARR instance name and base URL input placeholders are now rendered dynamically based on the selected instance type: placeholders show "My Sonarr" / "http://localhost:8989" for Sonarr and "My Radarr" / "http://localhost:7878" for Radarr.

Changes

Cohort / File(s)	Summary
Dynamic Placeholder Text web/src/components/settings/ArrInstancesManager.tsx	Updated form input placeholders to conditionally display name and base URL examples matching the selected ARR type (Sonarr vs. Radarr). No behavioral or API changes.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 I tweak a prompt, so fields align,
Sonarr or Radarr—placeholders shine,
A hop, a hint, a gentle nudge,
Forms feel friendlier—no techy grudge. 🥕✨

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The PR title accurately describes the main change: updating placeholder text in ArrInstanceForm to be dynamic based on instance type.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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