fix(app): export Filesystem/Share from build:web native stubs

[NubsCarson]

Problem

bun run --cwd packages/app build:web failed with:

"Filesystem" is not exported by "native-stub:@capacitor/filesystem"

src/ios-attachment-smoke.ts (the iOS attachment save/share smoke path shipped in #11009) statically imports { Filesystem } from @capacitor/filesystem and { Share } from @capacitor/share. main.tsx pulls it in statically (it only runs behind an isIOS gate), so the web bundle must still resolve those named exports — but the native-module stub plugin emitted only a default noop object for both packages.

Fix

packages/app/vite/native-module-stub-plugin.ts: add explicit named Filesystem / Share exports to the web stubs for @capacitor/filesystem and @capacitor/share.

Deliberately throwing stubs (Proxy where every method throws mobile-only) rather than silent no-ops: a silent no-op here would fabricate a successful file write or share if a web/desktop code path ever called it.

Verification

• bun run --cwd packages/app build:web passes clean on this branch merged with current develop (424 assets, chunk-safety verifier OK) — previously failed at the Rollup export-resolution step.
• Net diff vs develop is 18 lines in the stub plugin only (the branch's index.browser.ts redact-export hunk was already superseded by develop's export * from "./security/redact" fix(#12229): route Feed A2A fetch through SSRF guard + converge log redaction #12572 follow-up and resolved away at merge).

Finishing + shipping uncommitted sibling-agent work from the shared worktree.

— nubs-cloud [cloud-frontdoor]

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[lalalune]

Local validation from isolated checkout /tmp/eliza-pr-12936.

Passed:

bun run --cwd packages/app test -- test/native-module-stub-plugin.test.ts
git diff --check github-develop...HEAD

Result: focused app test passed (1 test).

I also directly exercised nativeModuleStubPlugin for the two affected virtual modules:

bun -e 'import { nativeModuleStubPlugin } from "./packages/app/vite/native-module-stub-plugin.ts"; const p = nativeModuleStubPlugin({ command: "build", mode: "production" }); const plugin = Array.isArray(p) ? p[0] : p; for (const id of ["@capacitor/filesystem", "@capacitor/share"]) { const resolved = await plugin.resolveId.call({}, id, "/tmp/entry.ts", {}); const loaded = await plugin.load.call({}, resolved); if (id.includes("filesystem") && !loaded.includes("export const Filesystem")) throw new Error("missing Filesystem export"); if (id.includes("share") && !loaded.includes("export const Share")) throw new Error("missing Share export"); }'

Result: both virtual modules resolved and loaded; @capacitor/filesystem exports Filesystem, and @capacitor/share exports Share, both as throwing mobile-only proxies.

Could not complete locally:

bun run --cwd packages/app build:web

It fails before this stub path because the linked temp install cannot resolve @tailwindcss/vite while loading packages/app/vite.config.ts. I would rely on CI or a complete install for the full build:web confirmation.

[lalalune]

Reviewed the effective diff against current develop: only packages/app/vite/native-module-stub-plugin.ts changes. The added Filesystem and Share named exports match the static imports in src/ios-attachment-smoke.ts, and using throwing mobile-only stubs is the right failure mode for accidental web/desktop calls.

Local checks: git diff --check origin/develop...pr-12936 passed; bunx @biomejs/biome check packages/app/vite/native-module-stub-plugin.ts passed. I also retried bun run --cwd packages/app build:web after building packages/shared; it passed the original Capacitor export-resolution blocker, then hit unrelated local checkout/dist dependency issues (@elizaos/core dist/browser missing warnings and a three-vrm/three.webgpu mismatch), so I’m relying on the attached clean build evidence for the full app build.

[lalalune]

Added a focused regression test for this fix in packages/app/test/native-module-stub-plugin.test.ts.

Local validation after applying the PR branch:

• bun test packages/app/test/native-module-stub-plugin.test.ts — passes, 2 tests / 11 expects. The new test imports the generated virtual @capacitor/filesystem and @capacitor/share modules and verifies named Filesystem / Share exports exist, default exports match, and calls throw mobile-only rather than silently no-oping.
• bunx @biomejs/biome check packages/app/vite/native-module-stub-plugin.ts packages/app/test/native-module-stub-plugin.test.ts — passes.

Local blockers not caused by this PR:

• bun run --cwd packages/app build:web fails before Rollup reaches the Capacitor export resolution path because this sparse checkout's node_modules is missing @tailwindcss/vite while packages/app/package.json and bun.lock declare it.
• bun run --cwd packages/app typecheck is blocked by the sparse checkout / install state with missing workspace packages and native package declarations across packages/agent, @elizaos/ui, Capacitor packages, etc.

I did not run audit:app: this change is limited to Vite's web-build native module stubs and does not alter rendered app UI.