Add Google OAuth sign and and user attributes

[apdarr]

Closes #111

[Copilot]

Pull request overview

Adds Google OAuth login alongside existing Strava OAuth, stores Google credential attributes on User, and begins adapting the UI/flows to support Google-only accounts (including Strava linking from Profile). It also refactors the plan “week selector” UI to be server-driven via a week query param and introduces Active Record encryption for stored OAuth tokens.

Changes:

• Add Google OAuth provider (routes + OmniAuth initializer), user persistence logic, and tests for sign-in/linking flows.
• Add encrypted Google token fields to users plus Active Record encryption configuration.
• Refactor plan calendar week selection to a GET week parameter (removing the Stimulus week selector controller) and preserve week across activity create/edit flows.

Reviewed changes

Copilot reviewed 44 out of 45 changed files in this pull request and generated 11 comments.

Show a summary per file

File	Description
test/test_helper.rb	Filters Google credentials in VCR cassettes.
test/system/sessions_test.rb	Adds system test coverage for Google sign-in and updates flash assertions.
test/system/plans_test.rb	Updates selectors to match new server-driven week selector + link-based buttons.
test/models/user_test.rb	Adds tests for Google user creation/linking and Strava linking helpers.
test/models/activity_test.rb	Adds tests for Activity#matched_strava_activity.
test/jobs/match_strava_activity_job_test.rb	Removes tests for deleted Strava matching job.
test/fixtures/users.yml	Adds Google-only and linked users for new test scenarios.
test/controllers/sessions_controller_test.rb	Adds integration tests for Google callback, failures, and Strava linking behavior.
test/controllers/profile_controller_test.rb	Tests profile behavior differences for Google-only vs Strava-connected users.
db/schema.rb	Reflects new Google OAuth columns and index on users.
db/migrate/20260210214202_add_google_oauth_to_users.rb	Adds Google UID and token fields to users.
config/routes.rb	Adds Google auth endpoints and an OmniAuth failure endpoint.
config/initializers/omniauth.rb	Adds Google OAuth2 provider configuration and updates Strava scope.
config/credentials/test.yml.enc	Updates encrypted test credentials.
config/credentials/production.yml.enc	Updates encrypted production credentials.
config/credentials/environment.yml.enc	Updates encrypted environment credentials.
config/credentials/development.yml.enc	Updates encrypted development credentials.
config/application.rb	Enables reading unencrypted data during encryption rollout.
app/views/sessions/new.html.erb	Adds “Continue with Google” button on login page.
app/views/profile/edit.html.erb	Shows Strava webhook settings only when Strava is connected; adds “Connect Strava” CTA otherwise.
app/views/plans/show.html.erb	Replaces Stimulus-based week switching with GET week param and reworks Add/Edit links to preserve week.
app/views/activities/show.html.erb	Enhances layout; shows linked Strava activity details when present.
app/views/activities/new.html.erb	Updates layout and links back to plan with week.
app/views/activities/edit.html.erb	Updates layout and links back to plan with week.
app/views/activities/_form.html.erb	Preserves week via hidden field and adjusts cancel behavior.
app/models/user.rb	Adds encryption for OAuth tokens; implements Google sign-in/linking + Strava token refresh helpers.
app/models/activity.rb	Adds helper to fetch matched/linked StravaActivity.
app/jobs/match_strava_activity_job.rb	Removes old Strava matching job.
app/jobs/fetch_and_match_strava_activity_job.rb	Refactors to fetch Strava activity using refreshed tokens and attempts to match/link activities.
app/javascript/controllers/week_selector_controller.js	Removes the Stimulus controller previously used for week switching.
app/controllers/sessions_controller.rb	Adds OAuth failure action; supports Google provider and Strava linking flow.
app/controllers/profile_controller.rb	Prevents enabling Strava webhooks for users without a connected Strava account.
app/controllers/plans_controller.rb	Introduces @week parameter for plan show.
app/controllers/activities_controller.rb	Preserves week through new/edit/create/update flows and redirects.
Gemfile	Adds omniauth-google-oauth2.
Gemfile.lock	Locks omniauth-google-oauth2 dependency.
.github/skills/views/SKILL.md	Adds repository guidance for Rails views patterns.
.github/skills/testing/SKILL.md	Adds repository guidance for Minitest/VCR/system tests.
.github/skills/security/SKILL.md	Adds repository guidance for Rails security practices.
.github/skills/models/SKILL.md	Adds repository guidance for ActiveRecord/model patterns.
.github/skills/jobs/SKILL.md	Adds repository guidance for Rails 8 Solid Stack background jobs.
.github/skills/hotwire/SKILL.md	Adds repository guidance for Hotwire/Turbo/Stimulus usage.
.github/skills/debugging/SKILL.md	Adds repository guidance for debugging Rails issues.
.github/skills/controllers/SKILL.md	Adds repository guidance for controller conventions and strong params.

Comments suppressed due to low confidence (1)

app/controllers/activities_controller.rb:61

• Same issue on update: redirect_to plan_path(@activity.plan, week: @week) will raise when @activity.plan is nil. Add a nil-safe fallback redirect or enforce presence of a plan for activities that use the plan calendar flow.

      if @activity.update(activity_params)
        format.html { redirect_to plan_path(@activity.plan, week: @week), notice: "Activity was successfully updated." }
        format.json { render :show, status: :ok, location: @activity }