fix(frontend): canonicalize daemon identity paths

[anirudh5harma]

Closes #414

Problem

The Electron supervisor can reject a healthy daemon from the same checkout when
macOS reports the checkout path with different casing. In that state the
renderer shows the empty project board even though /api/v1/projects and
/api/v1/sessions return real data.

Change

• move daemon path identity checks into a shared path-identity helper
• canonicalize paths with realpathSync.native() before comparing them
• preserve Windows case-insensitive comparisons
• canonicalize the nearest existing ancestor for not-yet-created child paths
• cover same-path and child-path behavior with focused tests

Tests

cd frontend
export NVM_DIR="$HOME/.nvm"
. "$NVM_DIR/nvm.sh"
nvm use 20

npm test -- --run src/shared/path-identity.test.ts src/shared/daemon-attach.test.ts
npm test

Results:

2 passed (2), 34 passed (34)
31 passed (31), 307 passed (307)

Verification

Verified against the live Electron renderer through the Chromium DevTools
protocol after restarting npm run dev:

• window.ao.daemon.getStatus() reports state: "ready"
• the board renders demo-repo
• the board renders worker sessions demo-repo-1 and demo-repo-2