fix(devtools): proper XDG base dir support

[computed-fn]

🔗 Linked issue

resolves #915

📚 Description

The problem with the current implementation is it fallback to the wrong place. Per the XDG specfication:

If $XDG_CONFIG_HOME is either not set or empty, a default equal to $HOME/.config should be used.

Also since the directory is now correctly set, we can remove the dot prefix following other convention

[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: 02ccf2aa-3abe-4347-8cf9-0d44b6a35d95

📥 Commits

Reviewing files that changed from the base of the PR and between fb46d67 and 1fd8475.

📒 Files selected for processing (1)

• packages/devtools/src/utils/local-options.ts

🚧 Files skipped from review as they are similar to previous changes (1)

• packages/devtools/src/utils/local-options.ts

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📝 Walkthrough

Walkthrough

Devtools now exports getOptionsDir() to resolve storage locations by operating system and XDG configuration settings. Local option JSON files and development authentication tokens use this resolver, with the JSON paths stored under nuxt/devtools. The previous getHomeDir()-based path construction was removed.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly reflects the main change: improving XDG base directory handling for devtools.
Description check	✅ Passed	The description matches the XDG config directory fix and the removal of the leading dot.
Linked Issues check	✅ Passed	The changes address #915 by moving devtools paths under the XDG config base and dropping the hidden .nuxt prefix.
Out of Scope Changes check	✅ Passed	The diff appears limited to XDG path handling and related option/token file path updates.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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• Create PR with unit tests

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[coderabbitai]

Actionable comments posted: 2

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@packages/devtools/src/utils/local-options.ts`:
- Around line 58-59: Update the filePath construction near getOptionsDir in the
local options utility to append only the hashed JSON filename, using the
directory returned by getOptionsDir directly. Keep the storage location
consistent with dev-auth.ts and avoid adding another .nuxt/devtools suffix.
- Around line 22-25: Update getOptionsDir so XDG_CONFIG_HOME values that are
empty strings use the existing $HOME/.config fallback; preserve configured
non-empty values and the final nuxt/devtools path construction.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 15ecbdea-386b-4f57-9c6a-6f86f8f80f15

📥 Commits

Reviewing files that changed from the base of the PR and between c081250 and fb46d67.

📒 Files selected for processing (2)

• packages/devtools/src/dev-auth.ts
• packages/devtools/src/utils/local-options.ts