docs(readme): hero catchphrase + flash/SSR-mismatch lead

[SutuSebastian]

Align the README opening with the new GitHub repo description + catchphrase.

• Add hero line under the H1: Any store, any storage, one middleware — no flash.
• Rewrite the opening paragraph to lead with the two chore(ci): bump actions/checkout from 4 to 7 #1 documented pains (hydrate flash + SSR mismatch — grounded in an OSS issue scan across zustand-persist / redux-persist / @tanstack/query-persist-client / pinia-plugin-persistedstate), then store-agnostic PersistableSource (TanStack first), composable backend × codec × source seams (swap without rewriting), the first-class hydration signal, and capability breadth (cross-tab, versioned migrations, encrypted/compressed, retry-on-quota) + framework adapters.

Docs-only (README opening). The size badge + TOC below are unchanged.

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Latest commit: ed55760

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 29bc0dee-850b-4bc6-99e3-b05117ca4698

📥 Commits

Reviewing files that changed from the base of the PR and between 1452a1e and ed55760.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

The README's introductory paragraph was replaced with new copy describing the middleware as store-agnostic and storage-agnostic, highlighting hydration signaling, structural composition seams, cross-tab sync, migrations, and encrypted/compressed backend support.

Changes

README Tagline Update

Layer / File(s)	Summary
Update tagline description README.md	Replaced the prior hydration-aware middleware description with a new "Any store, any storage, one middleware — no flash" paragraph.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the docs-only README update and highlights the new hero catchphrase and flash/SSR-mismatch introduction.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/readme-hero-catchphrase

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