Fixed assets, fully featured: tags, serials, acquisition links, label sheets, the fixed asset register, and an Assets section in the viewer; fix a flaky verify

- core: asset tags (generated PREFIX-0001 or the human's own; unique ignoring case; never reused by another asset) and serial numbers (rules.md B-24); a journaled link from an asset to the entry that acquired it (posted, unreversed, debiting the cost account); fixed_asset_register(as_of), reconciled to the GL (unposted depreciation, unregistered cost)
- store: asset.tagged, asset.serial_set, asset.acquisition_linked journaled, replayed, projected (schema v9); differs_from now also compares control roles and tag history
- config: [books] asset_tag_prefix, default the company's initials without legal-form words
- import: Avery 5160/8160 label sheets with QR codes (geometry vendored from Avery, docs/spec/sources/avery-5160.md); the register as XLSX and PDF
- mcp: register_asset tags (and links) automatically; books.label_asset, books.asset_labels; asset tools take a tag; books.show asset / assets page / register report; export fixed_asset_register (json, csv, xlsx, pdf) and in the CPA package
- viewer: Assets page (register, reconciliation), asset page (identity, schedule posted vs not, entries, documents), Fixed asset register report, global search by tag/serial/description, journal text, needs-attention items
- fix: verify compared snapshot amounts as strings; a zero total summed in hash-map order could print "0" or "0.00", so agreeing books failed verify at random. Now by value (regression test)
- tests: spec-blind suites for tags, register, prefix, store, MCP; label and register PDF/XLSX tests; viewer tests

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GWVo7x3UHw5kwCUaWxiejX

crates/ledger-gui/src/app.rs

@@ -21,6 +21,7 @@ pub struct PageState {
     pub transactions: pages::transactions::State,
     pub reports: pages::reports::State,
     pub accounts: pages::accounts::State,
+    pub assets: pages::assets::State,
     pub documents: pages::documents::State,
     pub journal: pages::journal::State,
 }
@@ -121,6 +122,7 @@ impl App {
                 "transactions" => Route::Transactions,
                 "reports" => Route::Reports(ReportKind::ProfitAndLoss),
                 "accounts" => Route::Accounts,
+                "assets" => Route::Assets,
                 "documents" => Route::Documents,
                 "company" => Route::Company,
                 "journal" => Route::Journal,
@@ -170,6 +172,7 @@ impl App {
                     "vendor_1099" => ReportKind::Vendor1099,
                     "ar_aging" => ReportKind::ArAging,
                     "ap_aging" => ReportKind::ApAging,
+                    "fixed_asset_register" => ReportKind::FixedAssetRegister,
                     _ => return,
                 };
                 if let (s, e) = (date(&start), date(&end))
@@ -182,6 +185,12 @@ impl App {
                 Route::Reports(kind)
             }
             T::Document { attachment_id } => Route::Document(attachment_id),
+            T::Asset { asset_id } => {
+                if b.ledger.get_asset(asset_id).is_none() {
+                    return;
+                }
+                Route::Asset(asset_id)
+            }
             T::Search { query } => {
                 let st = &mut self.state.transactions;
                 st.query = query;