Save dev_store_url under ./shopify

[isaacroldan]

WHY are these changes introduced?

Moves the dev store URL from the app configuration file to a hidden configuration file to prevent the store URL from being tracked in git. This ensures developers can use different development stores without impacting other team members.

WHAT is this pull request doing?

• Introduces a new hidden configuration file .shopify/project.json to store CLI-specific values
• Stores the dev_store_url both in shopify.app.toml and in the hidden configuration.
• Updates the store selection logic to read/write from the hidden configuration as a fallback if not present in the toml.
• Maintains backward compatibility by checking both locations for the store URL
• If the store was never stored in the toml, it will use the hidden config by default.

How to test your changes?

1. Run shopify app dev and select a development store
2. Verify the store URL is saved in .shopify/project.json
3. Verify the store URL is NOT removed from shopify.app.toml if present
   3a. Verify the store URL is NOT added to shopify.app.toml if not present previously.
4. Run shopify app dev again to confirm the stored development store is used
5. Use --store flag to verify store selection still works as expected

Measuring impact

• n/a - this doesn't need measurement, e.g. a linting rule or a bug-fix

Checklist

• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've considered possible documentation changes

[isaacroldan]

• Save dev_store_url under ./shopify #5000 👈 (View in Graphite)
• main

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[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟡	Statements	75.23% (+0.04% 🔼)	8928/11868
🟡	Branches	70.33% (+0.01% 🔼)	4361/6201
🟡	Functions	75.09% (+0.03% 🔼)	2333/3107
🟡	Lines	75.78% (+0.05% 🔼)	8441/11139

Show files with reduced coverage 🔻

St.❔	File	Statements	Branches	Functions	Lines
🟢	... / store-context.ts	100%	78.57% (-21.43% 🔻)	100%	100%
🟢	... / app-event-watcher.ts	93.83% (-1.23% 🔻)	86.49% (-2.7% 🔻)	90.48%	98.61%

Test suite run success

2010 tests passing in 906 suites.

Report generated by 🧪jest coverage report action from 44312b5

[github-actions]

We detected some changes at packages/*/src and there are no updates in the .changeset.
If the changes are user-facing, run "pnpm changeset add" to track your changes and include them in the next release CHANGELOG.