Restore custom URL scheme in mobile deep-link config

[AnthonyRonning]

Adds back the cloud.opensecret.maple custom scheme entry to the mobile deep-link config. This was accidentally removed in 9e6a5a2 (Dec 2, 2025) when fixing Android pathPrefix restrictions.

Without this entry, the Tauri deep-link plugin's build.rs sees no non-app-link mobile domains and strips CFBundleURLTypes from Info.plist, removing the custom URL scheme registration needed for iOS OAuth redirect.

The previous PR (build.rs workaround) is a safety net; this is the proper config-level fix. Does not affect Android -- custom schemes without a host don't generate intent filters.

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Summary by CodeRabbit

Release Notes

• New Features
  • Added mobile deep-linking support with a custom scheme integration, enabling users to launch the app directly from mobile links.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between d305190 and 43335d4.

📒 Files selected for processing (1)

• frontend/src-tauri/tauri.conf.json

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📝 Walkthrough

Walkthrough

Adds a new mobile deep-link scheme entry to the Tauri configuration, registering the custom scheme cloud.opensecret.maple with app linking explicitly disabled. This precedes existing HTTPS-based mobile deep-link entries in the configuration file.

Changes

Cohort / File(s)	Summary
Mobile Deep-Link Configuration frontend/src-tauri/tauri.conf.json	Added custom mobile deep-link scheme cloud.opensecret.maple with appLink set to false, enabling custom scheme-based deep-linking for mobile platforms.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• fix(android): generate separate intent-filters for deep links #390: Modifies the same mobile deep-link configuration entries, removing the custom scheme and adjusting HTTPS-based deep-link settings.
• Fix iOS OAuth redirect stuck on success screen #444: Implements OAuth redirect logic that utilizes the cloud.opensecret.maple custom scheme registered in this PR.
• Fix iOS OAuth deep link by preserving custom URL scheme in Info.plist #448: Ensures the cloud.opensecret.maple scheme is preserved in the iOS Info.plist build output.

Poem

🐰 A custom scheme hops into place,
cloud.opensecret.maple finds its space,
Mobile deep links now guide the way,
With app links resting at bay,
Configuration blooms today! 🌱

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: restoring a custom URL scheme in the mobile deep-link configuration, which matches the core objective of re-adding the cloud.opensecret.maple scheme entry.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/restore-mobile-custom-scheme

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✅ Devin Review: No Issues Found

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