refactor(ui): centralize document file-type icons in EMCN

[BillLeoutsakosvl346]

Summary

The document/file-type icon family is defined in the app instead of EMCN. Move all 14 existing SVG components into @sim/emcn/icons and update direct consumers, including the existing landing previews. Keep getDocumentIcon in the app with its MIME-type/extension selection order and upload-validation dependencies unchanged.

Preserve the complete icon functions: drawings, view boxes, strokes, PDF lettering, SVG prop forwarding and caller-provided sizes/colors. This is an independent PR against staging and does not depend on #7983.

The diff contains only the icon relocation, exports and import updates. The existing document-icon test changes imports only; no new tests, linter tooling, configuration or dependencies are included.

Type of Change

• Other: behavior-preserving UI consolidation

Testing

• 336 EMCN tests and 43 existing app tests passed (document selection, mention icons, attached files and file downloads).
• EMCN/app type checks, repository lint, API validation, SVG path precision and git diff --check passed.
• External source comparison verified all 14 original icon functions, unchanged selection logic and import-only consumer changes. All 42 rendered SVG comparisons matched exactly, including caller overrides.
• Final category check: 14 central icons, zero remaining findings, zero copied drawings and zero stale imports. Copy detection inspected 295 app/package source files containing SVG, including landing consumers. The 13 artwork findings and three PDF-lettering typography findings are resolved by relocating their unchanged definitions into EMCN.
• Final committed-diff audit: zero violations, 15 intentional central-artwork notifications for the 14 icon definitions and export barrel. The audit source hash matches the final checkout.

Validation uses source and rendered markup comparison; no browser screenshot comparison was performed. Unrelated audit findings and coverage gaps remain outside this file-type icon category.

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge because the relocation preserves icon rendering and leaves no stale imports or broken exports.

Summary

This PR centralizes the existing document file-type icon components in EMCN while retaining document-selection logic in the application.

• Moves 14 unchanged SVG icon implementations into packages/emcn/src/icons.
• Exposes the icons through the supported @sim/emcn/icons entry point.
• Updates application and landing-page consumers to use the centralized exports.
• Keeps getDocumentIcon, its selection order, and upload-validation integration unchanged.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  Consumers[Application and landing consumers] --> Icons["@sim/emcn/icons"]
  Selector["getDocumentIcon in apps/sim"] --> Icons
  Validation[Upload validation constants] --> Selector
  Icons --> Components[14 centralized SVG components]

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Project	Deployment	Actions	Updated
docs	Ready	Preview	Sep 18, 2026 9:59pm UTC

[cubic-dev-ai]

No issues found across 24 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

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