feat: add collapsible JSON payload viewer

[easyhooon]

Summary

• render valid request and response JSON as a lazy expandable tree
• allow arrays and objects to be collapsed independently with item/field count summaries
• preserve horizontal scrolling, malformed JSON fallback, and accessible expand/collapse actions
• cover nested containers, empty collections, collapsed descendants, and invalid JSON behavior

Validation

• ./gradlew :dari:detekt :dari:ktlintCheck :dari:testDebugUnitTest :sample:assembleDebug
• ./gradlew :sample:installDebug

Closes #85

Summary by CodeRabbit

• New Features
  • Valid JSON is now displayed as an expandable, navigable tree.
  • Collapsed objects and arrays show concise summaries, including item counts.
  • Added a setting to enable or disable JSON folding, with the preference saved between sessions.
  • Invalid JSON remains available as scrollable plain text.
  • Improved scrolling, indentation, icons, and accessibility support.
  • Added an expandable travel-itinerary sample for testing rich JSON responses.
• Bug Fixes
  • JSON content now fills the available detail view space more reliably.
• Tests
  • Added coverage for nested JSON, collapsing behavior, summaries, and malformed content.

[coderabbitai]

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 62ef629a-eadc-4a25-8a09-c539d2255da9

📥 Commits

Reviewing files that changed from the base of the PR and between e1b41d1 and 92b0440.

📒 Files selected for processing (1)

• AGENTS.md

📝 Walkthrough

Walkthrough

JsonViewer now renders valid payloads as expandable JSON trees. Invalid JSON remains scrollable plain text. A persisted preference controls folding in request and response tabs. The sample adds a nested travel itinerary response.

Changes

JSON folding

Layer / File(s)	Summary
JSON parsing and tree model dari/src/main/kotlin/com/easyhooon/dari/ui/components/JsonViewerModel.kt, dari/src/test/kotlin/com/easyhooon/dari/ui/components/JsonViewerModelTest.kt	The model builds recursive rows for JSON objects, arrays, and primitives. Tests cover parsing, summaries, collapse behavior, token types, empty containers, and malformed input.
Interactive JSON rendering dari/src/main/kotlin/com/easyhooon/dari/ui/components/JsonViewer.kt	The viewer renders expandable rows with scrolling, indentation, syntax colors, icons, and accessibility semantics.
Persisted folding setting and UI propagation dari/src/main/kotlin/com/easyhooon/dari/Dari.kt, dari/src/main/kotlin/com/easyhooon/dari/data/DariPreferences.kt, dari/src/main/kotlin/com/easyhooon/dari/ui/DariActivity.kt, dari/src/main/kotlin/com/easyhooon/dari/ui/DariDetailActivity.kt, dari/src/main/kotlin/com/easyhooon/dari/ui/components/SettingsBottomSheet.kt	The setting is stored in DataStore, exposed in the settings sheet, and passed to request and response payload viewers.
Nested sample payload sample/src/main/assets/sample.html, sample/src/main/java/com/easyhooon/dari/sample/MainActivity.kt	The sample adds a bridge request and a nested travel itinerary response.

Estimated code review effort: 4 (Complex) | ~45 minutes

Possibly related PRs

• easyhooon/dari#34: Both changes modify persisted settings and activity preference wiring.
• easyhooon/dari#35: Both changes extend DariPreferences, Dari.kt, activities, and SettingsBottomSheet.

Poem

A rabbit sees the JSON tree,
And folds deep branches neatly.
Keys and values line up bright,
Plain text stays in readable sight.
The setting saves each view.

🚥 Pre-merge checks | ✅ 3 | ❌ 2

❌ Failed checks (1 warning, 1 inconclusive)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 3.13% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.
Linked Issues check	❓ Inconclusive	The changes implement collapsible JSON trees, summaries, independent nesting, fallback rendering, and tests, but payload-state reset is not confirmed.	Confirm that expansion state resets when a different payload is opened, and add a regression test if needed.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the primary change: a collapsible JSON payload viewer.
Out of Scope Changes check	✅ Passed	The settings, sample itinerary, and viewer changes support or demonstrate JSON folding and remain related to issue #85.

✨ Finishing Touches 💡 1

📝 Generate docstrings 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/issue-85-collapsible-json

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