fix(app): keep home sessions without opened projects

[zcxGGmu]

Summary

• Extract the home session record builder into a pure helper for regression coverage
• Keep unfiltered home sessions when no projects have been opened locally, instead of dropping the entire list
• Use the session directory as fallback project metadata when no local project record matches

Refs #27837

Test Plan

• bun test --conditions=solid --preload ./happydom.ts ./src/pages/home/home-sessions-controller.test.ts --test-name-pattern "keeps sessions when no projects have been opened locally"
• bun test --conditions=solid --preload ./happydom.ts ./src/pages/home/home-sessions-controller.test.ts
• bun run lint packages/app/src/pages/home/home-session-records.ts packages/app/src/pages/home/home-sessions-controller.tsx packages/app/src/pages/home/home-sessions-controller.test.ts
• git diff --check

Note: packages/app typecheck currently fails on the existing src/custom-elements.d.ts placeholder (../../ui/src/custom-elements.d.ts), with no diff to that file in this branch.

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The following comment was made by an LLM, it may be inaccurate:

Based on the search results, I found two potentially related PRs:

1. PR fix(app): resolve a session's project by directory, not by shared ID #39666: fix(app): resolve a session's project by directory, not by shared ID

   • Related because it addresses session-project resolution using directory fallback logic

2. PR fix(app): adopt the server directory when no project is open #38992: fix(app): adopt the server directory when no project is open

   • Related because it handles project metadata fallback to directory when no local project record matches

These PRs deal with similar concerns about resolving sessions to projects when no local project records exist. However, they appear to be addressing different aspects of the same problem area. You may want to review these PRs to ensure there's no overlapping functionality or to verify if PR #40567 supersedes or complements them.

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