Fix Wahoo import bugs, add Import All, update spec

Bugs fixed:
- FIT parser returns timestamps as Date objects, not strings — convert
  to ISO 8601 before passing to generateGpx (caused str.replace crash)
- FIT parser already converts semicircles to degrees — remove redundant
  conversion that produced near-zero coordinates
- Wahoo CDN URLs are pre-signed S3 URLs — remove Bearer auth header
  from download requests (caused 400 "Unsupported Authorization Type")
- Filter out third-party workouts (fitness_app_id >= 1000) since Wahoo
  does not share their data via the API

UX improvements:
- Individual imports use fetcher (no page refresh), button shows
  "Importing..." inline
- "Import all" button imports all unimported workouts on the page
  sequentially with progress indicator
- Add @vitejs/plugin-basic-ssl for local HTTPS dev (opt-in via HTTPS=1)

Also adds unit test for FIT-to-GPX conversion with real fixture file,
and updates wahoo-import spec to reflect all behaviors.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

pnpm-lock.yaml

@@ -254,6 +254,9 @@ importers:
       '@types/react-dom':
         specifier: 'catalog:'
         version: 19.2.3(@types/react@19.2.14)
+      '@vitejs/plugin-basic-ssl':
+        specifier: ^2.3.0
+        version: 2.3.0(vite@6.4.1(@types/node@25.5.2)(jiti@2.6.1)(lightningcss@1.32.0)(tsx@4.21.0))
       pino-pretty:
         specifier: ^13.1.3
         version: 13.1.3
@@ -2069,6 +2072,12 @@ packages:
     resolution: {integrity: sha512-zhahknjobV2FiD6Ee9iLbS7OV9zi10rG26odsQdfBO/hjSzUQbkIYgda+iNKK1zNiW2ey+Lf8MU5btN17V3dUw==}
     engines: {node: ^18.18.0 || ^20.9.0 || >=21.1.0}
 
+  '@vitejs/plugin-basic-ssl@2.3.0':
+    resolution: {integrity: sha512-bdyo8rB3NnQbikdMpHaML9Z1OZPBu6fFOBo+OtxsBlvMJtysWskmBcnbIDhUqgC8tcxNv/a+BcV5U+2nQMm1OQ==}
+    engines: {node: ^18.0.0 || ^20.0.0 || >=22.0.0}
+    peerDependencies:
+      vite: ^6.0.0 || ^7.0.0 || ^8.0.0
+
   '@vitest/expect@4.1.2':
     resolution: {integrity: sha512-gbu+7B0YgUJ2nkdsRJrFFW6X7NTP44WlhiclHniUhxADQJH5Szt9mZ9hWnJPJ8YwOK5zUOSSlSvyzRf0u1DSBQ==}
 
@@ -5495,6 +5504,10 @@ snapshots:
       '@typescript-eslint/types': 8.57.2
       eslint-visitor-keys: 5.0.1
 
+  '@vitejs/plugin-basic-ssl@2.3.0(vite@6.4.1(@types/node@25.5.2)(jiti@2.6.1)(lightningcss@1.32.0)(tsx@4.21.0))':
+    dependencies:
+      vite: 6.4.1(@types/node@25.5.2)(jiti@2.6.1)(lightningcss@1.32.0)(tsx@4.21.0)
+
   '@vitest/expect@4.1.2':
     dependencies:
       '@standard-schema/spec': 1.1.0