Dark-mode button-text fix, Transfer tab controls, tracker edit fix, dev-client bundle ID, and lint/hooks cleanup

[taylorcox75]

Summary

• Dark-mode dialog text — filled primary/error buttons (delete confirmation's "Torrent Only"/"With Files", InputModal, LogViewer, category editor) colored their label with colors.surface, which is near-black in dark mode, making the text unreadable on the saturated fill. Adds a new additive onAccent color (always white) for text on a filled accent background.
• Functional gaps fixed — wires up Automatic Torrent Management toggling and adds Pause Downloads/Uploads to the Transfer tab (both existed but were unreachable), switches tracker edits to the atomic editTracker endpoint instead of remove-then-add (which could permanently lose a tracker if the add step failed), restores a missing disconnect-confirmation toast, fixes the About screen's RN version falling back to "N/A", and removes the unreachable Copy Hash action and its orphaned strings.
• Dev-client bundle ID — APP_VARIANT=development now switches app.config.js to com.taylorcox75.expogo, so the dev-client build can install side-by-side with the App Store build instead of overwriting it. The production identifier is unchanged.
• Lint/hooks correctness cleanup — reorders several data-loading functions ahead of the effects that call them, converts Animated.Value/PanResponder refs created via useRef(...).current to useState so they aren't read during render, reviews every exhaustive-deps warning individually (adding real missing deps, documenting deliberate omissions), and removes unused imports/vars/dead try-catch wrappers across the app and services layer.
• Toast positioning — net no-op. Toasts were moved to a near-bottom position to clear header controls, then moved back to the top after finding the keyboard covers a bottom toast on the server add/edit modal sheets. What actually lands is unchanged vertical placement (safeTop + spacing.sm, where spacing.sm is the same 8 as the previous literal) plus slightly narrower side margins (16 → 24pt). The torrents list's pre-existing header-offset override is untouched.

Why

Several of these were found while iterating on toast positioning in this session — the dark-mode text bug and a few functional gaps were noticed along the way and fixed in the same pass. The toast work itself ended up reverting to where it started; the incidental fixes are the substance of the PR. The lint/hooks cleanup was a deliberate pass through the warnings surfaced by newer lint rules, addressing genuine issues while documenting the handful of intentional exceptions.

Commits in this PR

• Fix functional gaps and remove dead code
• Redesign toast positioning to avoid blocking header controls
• Clean up lint warnings: unused code and loose types
• Fix hooks correctness warnings from the newer lint rules
• Give the dev-client build a distinct bundle ID
• Fix unreadable dialog button text in dark mode
• Move toast notifications back to the top

Test plan

• npx tsc --noEmit — clean.
• npm test — 69 suites / 989 tests passing (both node and rn projects).
• npm run lint — 0 errors (37 pre-existing baseline warnings, unchanged bar).
• npm run format — no changes needed.
• Not run on-device (no simulator/build in this environment) — worth a manual pass over the delete-confirmation and InputModal dialogs in dark mode, the Transfer tab's new AMM/pause controls, and toast positioning on the server add/edit screens with the keyboard open.
• This PR also bumps React Native 0.86.0 → 0.86.2, Expo 57.0.8 → 57.0.10 and reanimated 4.5.0 → 4.5.1. No JS-level check exercises the native build, so these want a npm run xcode device build before merge.

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