Slice up widget store; add ui, prefs and feedback stores

[Cas Linden (CasLinden)]

Summary

• slice up widget-store into bite sized chunks
• extract separate stores for feedback, ui and prefs
• remove some unused store fields and methods
• update imports
• update tests

This does not achieve clean state taxonomy in the frontend. Rather, it implements the architecture to help us think about a clean model, and also implement modularity.

Out of scope followup:

• further cleanup / unification of fields, renaming of slices / stores
• rebuild type sharing from rust (would likely require some ?? undefined)
• refactor "computeCurrentStep" to read store as a hook, and separate evolution state from step state
• fixing the wdio tests that broke when clearPreview was reintroduced by cursor

Test Plan

on par with develop

Suite	Pass	Fail	Skip
rust	317	0	2
vitest	93	0	0
basic-prompts	2	1	0
conversational	1	1	0
discard	2	0	0
manual-changes	2	0	0
modify	0	1	0
onboarding	0	1	0
smoke	4	0	0

Docs

• Readme updated

[github-actions]

	Warnings
⚠️	Please assign this PR to someone (usually yourself).
⚠️	❗ Big PR (3133 lines changed). Consider splitting it into smaller, focused changes.

📋 PR Overview

Lines changed	3133 (+1852 / -1281)
Files	15 added, 68 modified, 0 deleted
Draft / WIP	no
Has Test Plan	yes
New UI components	no
New Storybook stories	no
New Rust modules	no
New TS source files	yes (11)
New tests	yes (3)
package.json touched	no
Cargo.toml touched	no
Infra / CI touched	no

🔬 Coverage

Report	Lines	Statements	Functions	Branches
apps/native/coverage/coverage-summary.json	18.8%	18.8%	32.8%	54.9%

Generated by 🚫 dangerJS against 43a5c5f

[cooper (czxtm)]

can you split the formatting and renames into a separate commit?