feat(config): add currency symbol and conversion rate to rprompt

[tusharmath]

No description provided.

[graphite-app]

Schema default values are incorrect

The schema defaults (0.0 for conversion rate, "" for symbol) don't match the documented behavior in the Rust code comments which state defaults should be 1.0 and "$" respectively.

This inconsistency will confuse users and tooling that relies on the schema.

Fix: Update to match documented defaults:

"currency_conversion_rate": {
  ...
  "default": 1.0
},
"currency_symbol": {
  ...
  "default": "$"
}

Suggested change

	"currency_conversion_rate": {
	"description": "Conversion rate applied to costs before display in the shell rprompt.\nThe raw USD cost is multiplied by this value, allowing costs to be shown\nin a local currency. Defaults to `1.0` (no conversion).",
	"$ref": "#/$defs/double",
	"default": 0.0
	},
	"currency_symbol": {
	"description": "Currency symbol displayed in the shell rprompt next to the session cost\n(e.g. `\"$\"`, `\"€\"`, `\"₹\"`). Defaults to `\"$\"`.",
	"type": "string",
	"default": ""
	},
	"currency_conversion_rate": {
	"description": "Conversion rate applied to costs before display in the shell rprompt.\nThe raw USD cost is multiplied by this value, allowing costs to be shown\nin a local currency. Defaults to `1.0` (no conversion).",
	"$ref": "#/$defs/double",
	"default": 1.0
	},
	"currency_symbol": {
	"description": "Currency symbol displayed in the shell rprompt next to the session cost\n(e.g. `\"$\"`, `\"€\"`, `\"₹\"`). Defaults to `\"$\"`.",
	"type": "string",
	"default": "$"
	},

Spotted by Graphite



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