MidnightNameplates 0.10.2 - String Import/Export + Delete Confirmation

PROFILE DELETE
- Delete Active now opens an in-panel confirmation prompt.
- YES, DELETE performs deletion.
- CANCEL closes the prompt.
- Default remains protected.

STRING EXPORT TYPES
- FULL
- PROFILE
- NPC_RULES
- SPELL_RULES
- RULE_PACK

FORMAT
- Prefix: MNP1:
- Safe JSON-derived data encoded to Base64.
- No loadstring / code execution.
- Imported strings are parsed as plain data only.

IMPORT
- Paste string.
- Preview Import validates and summarizes it.
- Import modes:
  REPLACE
  MERGE
- Full/Profile imports require REPLACE.
- Rule imports can REPLACE or MERGE.

TEST
1. Generate FULL export and copy the string.
2. Change obvious settings.
3. Paste old string, Preview Import, then Import REPLACE.
4. Confirm old settings restore.
5. Export NPC_RULES and import MERGE.
6. Export RULE_PACK and import into another profile.
7. Paste malformed text: must reject cleanly.
8. Delete Test profile: confirmation must appear.
9. Cancel delete: profile remains.
10. Confirm delete: profile disappears and stays gone after /reload.
11. No Lua/taint/secret errors.
