Create FwLite data directories at FwLiteWeb startup

[imnasnainaec]

FwLiteWeb never created its project or auth-cache directories, unlike the MAUI host (FwLiteMauiKernel). That was harmless while the paths defaulted to the working directory (always present), but a host can point LcmCrdt:ProjectPath / Auth:CacheFileName at a per-user location that doesn't exist yet — and can't create it itself. When the directory is missing, three things throw on a fresh install:

• Project listing — CrdtProjectsService.ListProjects() calls Directory.EnumerateFiles(ProjectPath, "*.sqlite") with no existence guard → DirectoryNotFoundException.
• Project creation — opens a SQLite connection under ProjectPath; Microsoft.Data.Sqlite won't create parent dirs → "unable to open database file".
• Sign-in — MsalCacheHelper.CreateAsync opens a lockfile in the cache dir.

This creates both directories up front in SetupAppServer, mirroring what the MAUI host already does. Doing it in the backend covers every host, not just the one passing the path.

Addresses point 1 (the blocking finding) of the review on #2385: #2385 (comment) — the finding this PR unblocks stems from #2385 pointing FW Lite's data at ~/.platform.bible/extensions/lexicon/ (closes #2351).

Test plan

• dotnet build FwLiteWeb/FwLiteWeb.csproj succeeds (no new warnings)
• With --LcmCrdt:ProjectPath / --Auth:CacheFileName pointed at a non-existent per-user dir, FwLiteWeb starts, lists/creates projects, and signs in without a DirectoryNotFoundException

🤖 Generated with Claude Code

Devin review: https://app.devin.ai/review/sillsdev/languageforge-lexbox/pull/2417

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 12d6dd90-44e9-485e-b6a1-a09f5ed9e315

📥 Commits

Reviewing files that changed from the base of the PR and between 915ca19 and 407c5b4.

📒 Files selected for processing (1)

• backend/FwLite/FwLiteWeb/FwLiteWebServer.cs

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📝 Walkthrough

Walkthrough

FwLiteWebServer.cs now creates required data directories (LCM project path and MSAL auth cache file directory) at startup, before the HTTP request pipeline is configured, via a new private helper called from SetupAppServer.

Changes

Startup directory creation

Layer / File(s)	Summary
Ensure data directories exist at startup backend/FwLite/FwLiteWeb/FwLiteWebServer.cs	Adds EnsureDataDirectoriesExist(WebApplication app) which creates LcmCrdtConfig.ProjectPath and the directory of AuthConfig.CacheFileName, called from SetupAppServer right after builder.Build().

Estimated code review effort: 1 (Trivial) | ~5 minutes

Poem

A rabbit hops with folders in tow,
Creating paths where data will flow,
No more missing dirs to make us fret,
Startup's smooth as a burrow, you bet!
🐇📁✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Linked Issues check	⚠️ Warning	[#2351] The change creates missing directories, but it does not move mutable state off the binary-relative install dir.	Pass stable per-user data paths at launch or add a base data-dir setting, and migrate project, auth-cache, and log locations off the versioned install dir.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title is concise and accurately summarizes the main change: creating FwLite data directories at startup.
Description check	✅ Passed	The description clearly matches the change and explains the startup directory creation rationale and test plan.
Out of Scope Changes check	✅ Passed	The PR only adds startup directory creation in the touched server file and introduces no unrelated changes.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fwlite/ensure-web-data-dirs

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Build	Status	Details	Updated (UTC)
default (Inspect)	✅ No changes detected	-	Jul 6, 2026, 2:34 PM

[hahn-kev]

while we're doing this should we also introduce a base data dir like we have in the maui kernel? That would certainly simplify configuration and setting paths that we're doing today.

Up to you, if we're happy with how it works today then I'm fine to merge this.