fix: landing page WebP refs, hero layout, chat UI (#321)

* fix: landing page WebP refs, hero layout, chat UI improvements

- Convert all remaining .png/.jpg references to .webp across demo stories, workspace docs, and generate scripts
- Fix hero persona pills overlapping image at zoom by adding vertical padding
- Remove avatar from chat header
- Render multiple attachments side by side (images, PDFs, docs) with audio on its own row
- Right-align user attachments, size AI images larger than user images
- Make bold text semibold in markdown
- Remove redundant MRR Tracker attachment from founder briefing

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* chore: include models.generated.ts and dashboard layout changes

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* chore: remove generation scripts with hardcoded API keys

Delete scripts that had Google AI and FAL.ai keys committed
directly in source. Keys should be rotated.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

packages/ai/src/models.generated.ts

@@ -7646,23 +7646,6 @@ export const MODELS = {
       contextWindow: 8192,
       maxTokens: 16384,
     } satisfies Model<"openai-completions">,
-    "meta-llama/llama-3.1-405b-instruct": {
-      id: "meta-llama/llama-3.1-405b-instruct",
-      name: "Meta: Llama 3.1 405B Instruct",
-      api: "openai-completions",
-      provider: "openrouter",
-      baseUrl: "https://openrouter.ai/api/v1",
-      reasoning: false,
-      input: ["text"],
-      cost: {
-        input: 4,
-        output: 4,
-        cacheRead: 0,
-        cacheWrite: 0,
-      },
-      contextWindow: 131000,
-      maxTokens: 4096,
-    } satisfies Model<"openai-completions">,
     "meta-llama/llama-3.1-70b-instruct": {
       id: "meta-llama/llama-3.1-70b-instruct",
       name: "Meta: Llama 3.1 70B Instruct",