chore(deps): migrate monorepo library builds from tsup to tsdown

[singhyash05]

Summary

• Replaces tsup with tsdown for library builds across ~35 core/* and sdk/* packages.
• Shared config is now tsdown.base.ts (old tsup.base.ts and per-package tsup.config.ts files removed). Scripts and devDependencies point at tsdown@^0.22.9, including root and yarn.lock.
• Special cases kept working:
  • browser: provider-dapp, provider-ledger, rpc-transport, splice-provider
  • node: signing-internal, signing-participant, wallet-test-utils
  • ledger-proto: separate ESM/CJS outputs, CJS relative-import rewrite, CJS sourcemaps off (avoids SOURCEMAP_BROKEN spam)
• RPC generator TypeScript client template updated (_package.json + tsdown.config.ts) so yarn generate:* copies a config that resolves tsdown.base.ts from core/<client>/, not from the template directory.
• Source tweaks for rolldown: export type in ledger-client, signing-lib, and splice-client. Mixed default+named export packages set outputOptions.exports: 'named'.
• Root does not get "type": "module" — that would break .commitlintrc.js.
• Follow-up fix: ParsedURL no longer uses constructor parameter properties. Under tsdown/oxc, those emitted this before super() → ReferenceError in wallet-sdk e2e. Validate URL first, call super(), then assign fields.

Fixes #1965

Test plan

• Clean full rebuild (yarn clean:all && yarn build:all) — 45/45
• rg tsup — no leftovers in source/config
• yarn workspace @canton-network/wallet-sdk build — emit has super(validateUrl(...)) before this.ctx
• yarn nx playwright:e2e @canton-network/example-portfolio — 25 passed (localnet)
• CI e2e jobs green on PR

[alexmatson-da]

I think something might've broken the wallet SDK's module (CI job failed)

  1) [chromium] › tests/allocation-next.spec.ts:125:5 › OTC allocations › shows reservations and every settlement leg 

    ReferenceError: Must call super constructor in derived class before accessing 'this' or returning from derived constructor

       at ../../../sdk/wallet-sdk/src/wallet/namespace/utils/url.ts:11

       9 | export class ParsedURL extends URL {
      10 |     constructor(
    > 11 |         private readonly ctx: SDKContext,
         |                          ^
      12 |         private readonly input: URLInput
      13 |     ) {
      14 |         try {
        at ParsedURL (/home/runner/work/wallet/wallet/sdk/wallet-sdk/src/wallet/namespace/utils/url.ts:11:26)
        at map (/home/runner/work/wallet/wallet/sdk/wallet-sdk/src/wallet/init/initializedSDK.ts:122:28)
        at Object.asset (/home/runner/work/wallet/wallet/sdk/wallet-sdk/src/wallet/init/initializedSDK.ts:121:43)
        at ExtendedInitializedSDK.create (/home/runner/work/wallet/wallet/sdk/wallet-sdk/src/wallet/init/initializedSDK.ts:260:64)
        at SDK.create (/home/runner/work/wallet/wallet/sdk/wallet-sdk/src/wallet/sdk.ts:151:45)
        at OTCTrade.setup (/home/runner/work/wallet/wallet/core/wallet-test-utils/src/otc-trade.ts:65:20)
        at setupOtcTrade (/home/runner/work/wallet/wallet/examples/portfolio/tests/allocation-next.spec.ts:106:29)
        at /home/runner/work/wallet/wallet/examples/portfolio/tests/allocation-next.spec.ts:138:13

    Error Context: test-results/allocation-next-OTC-alloca-27cef-ns-and-every-settlement-leg-chromium/error-context.md

I recommend rebasing on latest main (we upgraded the repo's splice version recently).

The steps to repro what CI is doing (requires local docker setup):

• yarn script:fetch:localnet
• yarn start:localnet
• yarn build:all
• yarn start:all
• yarn nx playwright:e2e @canton-network/example-portfolio

[singhyash05]

@alexmatson-da , problem was ParsedURL: tsdown (oxc) compiles the constructor's parameter properties into assignments that run before super(), which throws on a class extending URL. Rewrote it to validate the URL, call super(), then set the fields.

Ran yarn nx playwright:e2e @canton-network/example-portfolio locally and all 25 passed. Rebased onto main too, thanks for the pointer.

[alexmatson-da]

looks great! thanks