fix: detect package manager for missing collection install suggestion

[arashsheyda]

🔗 Linked issue

closes #473

📚 Description

This PR detects the active package manager via process.env.npm_config_user_agent and shows the correct install command

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: c606fd99-34a4-4d8b-8669-3c2f70452400

📥 Commits

Reviewing files that changed from the base of the PR and between b45023d and db24779.

📒 Files selected for processing (1)

• src/runtime/server/api.ts

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📝 Walkthrough

Walkthrough

A new helper function getInstallCommand(pkg) was added to detect the active package manager by inspecting process.env.npm_config_user_agent and return the appropriate install command for pnpm, yarn, bun, or npm. The development-only warning message that displays when a requested icon collection isn't available locally now uses this helper to suggest the correct install command based on the detected package manager, replacing the previously hardcoded npm i -D instruction.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately and concisely describes the main change: detecting the package manager to provide the correct install suggestion.
Description check	✅ Passed	The description is related to the changeset, explaining that it detects the active package manager and shows the correct install command.
Linked Issues check	✅ Passed	The PR implements the objective from issue #473 by introducing getInstallCommand() helper that detects the package manager via process.env.npm_config_user_agent and provides the appropriate install command.
Out of Scope Changes check	✅ Passed	All changes are directly related to the stated objective of detecting the package manager and updating the install suggestion message; no out-of-scope modifications detected.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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