Intent keys -20000/-20001/-20002

[dioput12]

## Describe the Bug

**Intent key codes** `SEND_INTENT_ONE` (-20000), `SEND_INTENT_TWO` (-20001), and `SEND_INTENT_THREE` (-20002) **always fail JSON parsing** with "Too long text on key" error, even with minimal configurations. This appears to be a **preview validation bug** blocking all intent functionality.

## Steps to Reproduce

1. Create minimal intent key JSON:
```json
[{"label":"Test","code":-20000,"intent":{"action":"android.intent.action.VIEW"}}]

2. Import via Settings → Languages & Layouts → Edit layout → Load file

3. Result: Too long text on key: android.intent.ac... (truncated toast)

Additional Failing Examples

Option 1: Minimal intent (no extras)
{"label":"T","code":-20000,"intent":{"action":"com.termux.RUN_COMMAND","package":"com.termux"}}
→ FAIL: "Too long text on key: com.termux.RUN_COMMAN"

Option 2: codePoints bypass attempt
{"label":"T","type":"multi_text_key","codePoints":} [reddit](https://www.reddit.com/r/fossdroid/comments/1e81fvp/what_is_an_open_source_android_app_idea_that/)
→ FAIL: JSON parsing error

Option 3: Label format (like working 💻|!code/-1 popup)
{"label":"T|login"}
→ FAIL: Parser rejects pipe format on main keys

Expected Behavior

Intent keys should:

1. Parse valid JSON layouts containing code: -20000/-20001/-20002
2. Execute Android Intent broadcasts on tap (FlorisBoard heritage)
3. Support extras for Termux: com.termux.RUN_COMMAND

Current Behavior

All intent configurations rejected at parse time by preview validation toast. Text insertion (label|text) works but cannot execute shell commands directly.

Environment

• HeliBoard Version: 3.8 stable, tested beta/nouserlib/debug
• Android Version: 16
• Layout Type: Custom QWERTY main layout (row 1, position 5)

Minimal Reproduction File

test_intent.json (attach this file):

[
  {"label": "q"},
  {"label": "w"},
  {"label": "e"},
  {"label": "r"},
  {"label": "T","code":-20000,"intent":{"action":"android.intent.action.VIEW"}},
  {"label": "y"},
  {"label": "u"},
  {"label": "i"},
  {"label": "o"},
  {"label": "p"}
]

Additional Context

1. Working baseline: Complex popups like 💻|!code/-1 function perfectly
2. Intent heritage: Codes exist in KeyCode.kt but appear non-functional
3. Workaround: Manual text insertion → Termux Enter (not direct execution)
4. Previous attempts: 20+ JSON variants, all fail at preview validation

This blocks Termux automation workflows requiring direct shell command execution from keyboard. Request: either fix intent parsing or document as unsupported.