feat: migrate to color.app from @heroku/heroku-cli-util

[eablack]

https://gus.lightning.force.com/lightning/r/ADM_Work__c/a07EE00002T2hvTYAR/view

Summary

This is the first PR in a series to migrate from @heroku-cli/color to the new semantic color system in @heroku/heroku-cli-util. This PR specifically migrates all usage of color.app() for application names. It also resolves linting errors along the way.

Changes

• ✅ Updated @heroku/heroku-cli-util to 10.3.0
• ✅ Migrated 43 files to import color from @heroku/heroku-cli-util
• ✅ Replaced color.magenta(app) with color.app(app) for app name references
• ✅ Files only migrated if they exclusively use color.app()
• ✅ For files that require both new and old color, use newColor.app to preserve other color migrations for future PRs
• ✅ Files using other color functions (cmd, green, yellow, etc.) remain on old import for future PRs

Semantic Color Benefits

The new color system provides semantic meaning:

• color.app() → Purple with ⬢ symbol (instead of generic color.magenta())
• Makes code more readable and maintainable
• Consistent visual identity across CLI output

Files Updated

Commands (33 files)

• commands/apps/ - destroy, errors, favorites, join, leave, unlock
• commands/certs/ - add, auto/disable, info, remove, update
• commands/config/edit
• commands/domains/ - clear, remove
• commands/maintenance/ - off, on
• commands/pg/backups/ - 6 files
• commands/pipelines/ - add, diff, promote, remove, setup, update
• commands/ps/ - index, scale, type
• commands/releases/rollback
• commands/usage/addons

Lib (4 files)

• lib/apps/app-transfer
• lib/pipelines/setup/poll-app-setups
• lib/run/dyno
• lib/webhooks/base

Test Plan

• All existing tests pass
• TypeScript compilation successful
• No breaking changes to CLI output (symbol is added by semantic function)

Migration Plan

This is PR 1 of 17 in the color migration series. See COLOR_MIGRATION_PLAN.md for the full roadmap:

• PR 1: ✅ color.app (this PR)
• PR 2: color.space
• PR 3: color.addon
• PR 4-17: Other semantic colors

Review Notes

• Only app-related color usage has been migrated
• Other color functions (color.green, color.cyan, etc.) intentionally left on old import
• Package upgrade to 10.3.0 enables the new semantic color exports

[michaelmalave]

@eablack This looks great! I still see two instances of color.magenta(app) in packages/cli/src/commands/pg/connection-pooling/attach.ts. Based on the description, it seems like these would be updated too?

[michaelmalave]

@eablack Also just seeing this, I think packages/cli/src/commands/apps/create.ts needs an update to import and app related colors. That's should be the last bit for this part of the migration.

[michaelmalave]

After the final updates this looks complete. Nice work on this!