Home page in desktop, separate file support (#252)

* Bugfix: don't toast on every change of defaultDir

* Refactor app to live under /file/:id

* Stub out Tauri-only home page

* home reads and writes blank files to defaultDir

* Fix initial directory creation

* Make file names editable

* Refactor onboarding to use normal fns for load issues

* Feature: load and write files to and from disk

* Feature: Add file deletion, break out FileCard component

* Fix settings close URLs to be relative, button types

* Add filename and link to AppHeader

* Style tweaks: scrollbar, header name, card size

* Style: add header, empty state to Home

* Refactor: load file in route loader

* Move makePathRelative to lib to fix tests

* Fix App test

* Use '$nnn' default name scheme

* Fix type error on ActionButton

* Fix type error on ActionButton

* @adamchalmers review

* Fix merge mistake

* Refactor: rename all things "file" to "project"

* Feature: migrate to <project-name>/main.kcl setup

* Fix tsc test

* @Irev-Dev review part 1: renames and imports

* @Irev-Dev review pt 2: simplify file list refresh

* @Irev-Dev review pt 3: filter out non-projects

* @Irev-review pt 4: folder conventions + home auth

* Add sort functionality to new welcome page (#255)

* Add todo for Sentry

src/lib/tauriFS.test.ts

@@ -0,0 +1,48 @@
+import {
+  MAX_PADDING,
+  getNextProjectIndex,
+  interpolateProjectNameWithIndex,
+} from './tauriFS'
+
+describe('Test file utility functions', () => {
+  it('interpolates a project name without an index', () => {
+    expect(interpolateProjectNameWithIndex('test', 1)).toBe('test')
+  })
+
+  it('interpolates a project name with an index and no padding', () => {
+    expect(interpolateProjectNameWithIndex('test-$n', 2)).toBe('test-2')
+  })
+
+  it('interpolates a project name with an index and padding', () => {
+    expect(interpolateProjectNameWithIndex('test-$nnn', 12)).toBe('test-012')
+  })
+
+  it('interpolates a project name with an index and max padding', () => {
+    expect(interpolateProjectNameWithIndex('test-$nnnnnnnnnnn', 3)).toBe(
+      `test-${'0'.repeat(MAX_PADDING)}3`
+    )
+  })
+
+  const testFiles = [
+    {
+      name: 'new-project-04.kcl',
+      path: '/projects/new-project-04.kcl',
+    },
+    {
+      name: 'new-project-007.kcl',
+      path: '/projects/new-project-007.kcl',
+    },
+    {
+      name: 'new-project-05.kcl',
+      path: '/projects/new-project-05.kcl',
+    },
+    {
+      name: 'new-project-0.kcl',
+      path: '/projects/new-project-0.kcl',
+    },
+  ]
+
+  it('gets the correct next project index', () => {
+    expect(getNextProjectIndex('new-project-$n', testFiles)).toBe(8)
+  })
+})