Fix log editing: add missing edit view and Edit link

[Yanchek99]

Summary

• Log editing was completely broken: LogsController#edit/#update, the route, and the shared _form partial all existed, but app/views/logs/edit.html.slim was never added, so visiting the edit URL crashed with a missing-template error.
• The log show page also had no "Edit" link/button at all (only Delete), so there was no way to reach the edit page through the UI even once the template exists.
• Adds app/views/logs/edit.html.slim (mirrors the existing new.html.slim pattern) and an "Edit" button next to "Delete" on the show page.

Root cause

Reproduced locally: GET /workouts/:workout_id/logs/:id/edit raised LogsController#edit is missing a template for request formats: text/html. test/controllers/logs_controller_test.rb only covered the unauthorized edit path (404 for another user's log), never a successful edit by the owner, so the missing template/link went uncaught.

Test plan

• bin/rails test test/controllers/logs_controller_test.rb — 33 runs, 0 failures
• Manual verification in a local browser session: signed in as a seeded user, opened a log's show page, clicked the new Edit link, changed a Load value, submitted, confirmed "Log was successfully updated." and the new value persisted; reverted the test data change afterward
• No .rb files changed, so no RuboCop findings apply

🤖 Generated with Claude Code

[railway-app]

🚅 Deployed to the wod-tracker-pr-1871 environment in wod-tracker

Service	Status	Web	Updated (UTC)
web	✅ Success (View Logs)	Web	Aug 19, 2026 at 6:32 pm
worker	✅ Success (View Logs)		Aug 19, 2026 at 6:22 pm