feat: ledger-gui — a read-only, live desktop view of the books

egui/wgpu app for owners and their accountant: Overview, Cash, Profit,
Transactions (with rendered receipts and journal history), Reports
(statements with interval columns, comparisons, drill-down), Accounts,
Documents, Company, Journal; Ctrl+K palette; back/forward; light/dark.
Follows the journal live (~30 ms from write to screen). --demo opens a
deterministic demo company, also used for screenshot tests.

Engine: ledger-store Snapshot (read-only, incremental, tolerant of a
half-written tail); ledger-core analysis (intervals, balance series,
P&L by interval, cash flows); ledger-config extracted from ledger-mcp
with the full company profile and cash_accounts.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MtYEaR6M6Ybdhm6X98BWNu

crates/ledger-config/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name = "ledger-config"
+version = "0.1.0"
+edition.workspace = true
+license.workspace = true
+repository.workspace = true
+description = "Company settings for wanderbooks: the books dir's wanderbooks.toml."
+
+[dependencies]
+ledger-core = { path = "../ledger-core" }
+chrono = "0.4"
+rust_decimal = "1"
+serde = { version = "1", features = ["derive"] }
+toml = { version = "1", features = ["preserve_order"] }
+
+[lints]
+workspace = true