docs: add logo replacement design spec

docs/superpowers/specs/2026-04-21-logo-replacement-design.md

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+# Logo Replacement Design
+
+Date: 2026-04-21
+Topic: Comprehensive logo replacement using the provided lobster artwork
+
+## Summary
+
+Replace every current application logo surface with the user-provided lobster artwork while preserving the existing UI layout and copy. This includes in-app logo images, favicon and install icon assets, and manifest/head wiring. The existing wide social preview image `public/og.png` remains unchanged. Instead, `public/og-logo.png` is included in the replacement asset pack as a standalone logo export and is not wired into site metadata.
+
+## Goals
+
+- Replace all current logo imagery with the provided lobster art.
+- Preserve existing layout structure in header, mobile navigation, and hero content.
+- Provide dedicated asset files for browser, install, and app surfaces rather than relying on one large source image everywhere.
+- Keep runtime references stable where possible by replacing existing filenames in place.
+- Improve browser/device logo behavior by adding standard favicon and touch icon variants.
+
+## Non-Goals
+
+- No header, navigation, or hero layout redesign.
+- No typography or copy changes to the `ClawHub` wordmark text.
+- No change to the existing social preview card asset `public/og.png`.
+- No full vector redraw of the lobster artwork from scratch.
+
+## Scope
+
+### In Scope
+
+- Replace:
+  - `public/clawd-logo.png`
+  - `public/clawd-mark.png`
+  - `public/logo192.png`
+  - `public/logo512.png`
+  - `public/favicon.ico`
+- Add or update:
+  - `public/favicon-16x16.png`
+  - `public/favicon-32x32.png`
+  - `public/apple-touch-icon.png`
+  - `public/logo.jpg`
+  - `public/logo.svg`
+  - `public/og-logo.png`
+- Update runtime/browser metadata:
+  - root document link tags in `src/routes/__root.tsx`
+  - `public/manifest.json`
+
+### Out of Scope
+
+- `public/og.png`
+- Any route-level social metadata currently using `og.png`
+- Any non-logo artwork or unrelated illustration assets
+
+## Current State
+
+- The app currently references `public/clawd-logo.png` in the desktop and mobile header.
+- The homepage hero references `public/clawd-mark.png`.
+- The root document exposes `/favicon.ico`, `/logo192.png`, and `/manifest.json`.
+- The web app manifest references `favicon.ico`, `logo192.png`, and `logo512.png`.
+- The site-wide OG metadata still references `og.png`.
+
+## Recommended Approach
+
+Use the provided lobster image as the master artwork and derive a small asset pack tailored to each output surface.
+
+Why this approach:
+
+- It satisfies the request to replace the logo everywhere it appears.
+- It avoids visual degradation from blindly reusing one oversized raster in tiny favicon contexts.
+- It minimizes application code changes by preserving the established filenames used by the UI.
+
+## Asset Plan
+
+### Master Asset
+
+Create one high-resolution square source derived from the attached lobster artwork. This will be the basis for all exported formats.
+
+### Replacement Assets
+
+- `clawd-logo.png`
+  - High-resolution square PNG used by header/mobile brand image references.
+- `clawd-mark.png`
+  - High-resolution square PNG used by hero/logo-only surfaces.
+- `logo192.png`
+  - 192×192 install icon.
+- `logo512.png`
+  - 512×512 install icon.
+- `favicon.ico`
+  - Multi-size favicon generated from the same master for browser tab use.
+- `favicon-16x16.png`
+  - Explicit raster favicon for browsers that prefer PNG.
+- `favicon-32x32.png`
+  - Explicit raster favicon for higher-density tab/bookmark use.
+- `apple-touch-icon.png`
+  - 180×180 touch icon for iOS home screen usage.
+- `logo.jpg`
+  - Flattened JPEG export for contexts where a non-transparent logo file is useful.
+- `logo.svg`
+  - SVG wrapper asset that embeds the logo image in an SVG container so an SVG logo file exists for downstream usage without falsely claiming the art is natively vector.
+- `og-logo.png`
+  - Logo-focused branded raster asset retained separately from the existing wide social card `og.png`.
+
+## Runtime Wiring
+
+### Application UI
+
+- Keep existing JSX references to `clawd-logo.png` and `clawd-mark.png` unless a clearer dedicated asset path becomes necessary.
+- Do not replace image elements with text or SVG components.
+
+### Root Head Tags
+
+Update `src/routes/__root.tsx` to use dedicated icon assets:
+
+- `rel="icon"` should include PNG favicon variants in addition to the ICO.
+- `rel="apple-touch-icon"` should point to `apple-touch-icon.png`.
+- `rel="manifest"` remains `manifest.json`.
+- OG/Twitter metadata remains wired to `og.png` and is not changed.
+
+### Web App Manifest
+
+Update `public/manifest.json` so install surfaces reference the replacement icon assets. Keep the manifest conservative and omit maskable-specific `purpose` values for this change.
+
+## Data Flow
+
+1. Start from the provided lobster artwork.
+2. Export optimized raster variants for each target size.
+3. Replace or add files in `public/`.
+4. Update root document links and manifest entries.
+5. Build the app and verify the logo surfaces still render without layout regressions.
+
+## Error Handling And Risks
+
+### Small-Size Legibility
+
+Risk: the artwork is detailed and may lose clarity at favicon sizes.
+
+Mitigation:
+
+- Generate dedicated 16×16 and 32×32 outputs instead of relying only on browser downscaling.
+- Prefer the ICO plus PNG favicon set to maximize compatibility.
+
+### Raster-As-Vector Expectations
+
+Risk: a pure SVG redraw would be time-consuming and subjective.
+
+Mitigation:
+
+- Provide `logo.svg` as an SVG container asset, while using raster files for browser/runtime surfaces that need visual fidelity.
+
+### Unintended Social Preview Changes
+
+Risk: a broad asset refresh accidentally changes OG behavior.
+
+Mitigation:
+
+- Explicitly leave `og.png` and its metadata references untouched.
+- Treat `og-logo.png` as a separate logo asset only.
+
+## Testing And Verification
+
+- Confirm the generated files exist in `public/` with expected dimensions.
+- Run the production build to ensure asset references still resolve.
+- Spot-check the following surfaces:
+  - desktop header brand image
+  - mobile navigation brand image
+  - homepage hero lobster image
+  - browser favicon and touch icon wiring
+  - manifest icon references
+- Verify that `og.png` remains unchanged and the site metadata still references it.
+
+## Implementation Notes
+
+- Use minimal code churn: replace files in place where existing paths are already correct.
+- Add new icon files only where they improve browser/device handling.
+- Keep the change tightly scoped to branding assets and metadata.
+
+## Acceptance Criteria
+
+- Every current application logo surface displays the provided lobster artwork instead of the previous brand image.
+- Favicon, touch icon, and install icons resolve to replacement assets.
+- Header/mobile/hero layout remains unchanged.
+- `og.png` is not modified.
+- `og-logo.png` exists as part of the updated asset pack.
+- The app builds successfully after the change.