fix: enable fixPath() on Linux and call it before health check

[arthurbm]

What Changed

• apps/desktop/src/syncShellEnvironment.ts and apps/server/src/os-jank.ts: changed platform guard from !== "darwin" to === "win32"
• apps/server/src/main.ts: added top-level fixPath() call before any Layer construction

~5 lines changed across 3 files.

Why

On Linux (AppImage), the Codex provider health check always fails with "Codex CLI (codex) is not installed or not on PATH" even when codex is installed and works from the terminal.

Two issues combine to cause this:

1. syncShellEnvironment() / fixPath() skip Linux entirely — both files guard with process.platform !== "darwin", so readPathFromLoginShell() / readEnvironmentFromLoginShell() (which already work on Linux) are never called. On Linux AppImage the process inherits a minimal PATH that doesn't include user shell paths like ~/.nvm/versions/node/*/bin.

2. Server calls fixPath() too late — it runs inside Effect.gen (line 243) but ProviderHealthLive is constructed as a Layer (line 200) which executes before the Effect body. The health check (codex --version) fires with the unfixed PATH. apps/desktop/src/main.ts already calls syncShellEnvironment() at module top-level — the server just needs to match this pattern.

See #1139 for full details and reproduction steps.

Testing

• Verified on Ubuntu 22.04 with T3 Code AppImage v0.0.11, Node v24 via nvm, codex-cli 0.114.0
• Before fix: "Codex CLI (codex) is not installed or not on PATH"
• After fix: Codex provider status shows ready
• macOS behavior unchanged (same logic, just wider platform gate)
• Windows still skipped (=== "win32" guard)

Checklist

• This PR is small and focused
• I explained what changed and why

Closes #1139

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