fix(AppShell): wire up <width/> control hint to the frontend

[alexwarren]

Summary

• Part of Editor: several v5 .aslx control hints not wired through to AppShell (freetext, min/max/increment, nullable, width, ...) #2116, which described this one as "half-wired": IEditorControl.Width was already parsed on the backend (EditorControl.cs) but ControlInfo had no field for it and ToControlInfo never read it, so every <width> hint (24 uses across 13 .aslx files, e.g. an exit's "to" object picker at 200px, a function's return type at 150px) was silently dropped before ever reaching the frontend.
• Threads ctrl.Width through ControlInfo (including the early-return "filter" branch, which also uses it) into an inline pixel-width style on number/numberdouble/dropdown/dropdowntypes/objects/textbox/filter controls in PropertyEditor.svelte. A plain Tailwind class can't express this since the value is only known at runtime (Tailwind's static class scanning can't see a dynamically-interpolated pixel value) - an inline style is required, and it overrides the existing default-sizing Tailwind classes since inline style always wins in the cascade.
• Combobox.svelte gains an optional style prop (applied to its <input>) for the dropdown/objects cases.
• Not covered: the file controltype's 2 uses (CoreEditorJavascript.aslx, CoreEditorIncludedLibrary.aslx) - AssetPicker.svelte has no style passthrough yet. Left as a small follow-up rather than expanding this PR's surface.

Test plan

• dotnet build --configuration Release
• dotnet test --configuration Release (all passing)
• npm run check / npm run lint in src/AppShell (clean)
• node tests/e2e/find-affected-tests.mjs + ran the relevant flagged scripts (verify-appshell-exits-editor, verify-appshell-unlock-exit-picker, verify-appshell-verbs-editor) against a local dev server - all pass. (verify-appshell-multi-control-editors fails identically on main before this change - pre-existing, unrelated.)
• Manual check in-browser: an exit's "To:" object picker now measures width: 200px (matching <width>200</width>), its "Type:" dropdown measures width: 150px (matching <width>150</width>), and an unrelated select with no <width> tag has no inline style at all.

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