## Summary

- avoid reloading raw import assets as ordinary module graph roots in
bundle watch mode
- add regression coverage for rebuilding after CSS and TypeScript
changes

## Root cause

Raw imports are represented as external assets in the module graph, and
their contents are fetched by the bundle loader. Watch invalidation
passed a changed CSS asset to `ModuleGraph::reload()`, which reloaded
the URL as an ordinary root without its `type: "css"` import context.
That poisoned the graph and caused every subsequent rebuild to reject
the CSS import.

External asset entries do not contain source that needs to be refreshed.
Esbuild calls the bundle loader again for the changed input, which
fetches the current contents, so watch mode now excludes those entries
from graph reload while retaining normal reload behavior for source
modules.

Fixes #36036.

## Validation

- `cargo build --bin deno`
- `cargo test -p integration_tests --test integration --
watcher::bundle_watch` (3 passed)
- `./tools/lint.js`
- `./tools/format.js --check`
- reproduced the reported HTML/`--outdir` workflow and verified CSS and
subsequent TypeScript changes both rebuilt successfully

Resolves conflicts:
- cli/tools/bundle/mod.rs: port reload_specifiers (incl. #36040 raw-import
  fix) onto the rolldown DenoPluginHandler and wire watch-mode reload of
  changed specifiers and HTML entrypoints (restores canonical_path)
- Cargo.lock: take main's, upgrade rolldown 1.0.0 -> 1.2.0 to fix
  duplicate oxc_sourcemap resolution

Claude-Session: https://claude.ai/code/session_01QXBexiVeaPBqGPgAxcTLNQ