fix(tui): resolve keybind conflicts and missing defaults (issue #4997)

[Ashwinhegde19]

This PR addresses multiple keybinding regressions and conflicts reported in Issue #4997 to improve TUI usability across platforms.

Changes
Ctrl+C Handling (Windows/Linux): Modified the Prompt component to prioritize "Copy" when text is selected. If no text is selected, it falls back to "Clear Input" or "Exit App".

Conflict Resolution:
Remapped model_provider_list from Ctrl+A to Ctrl+Alt+M. This restores the standard Emacs/Readline behavior where Ctrl+A moves the cursor to the start of the line.

Navigation & Editing Defaults:
Added Ctrl+N (Next) and Ctrl+P (Previous) to both history navigation and vertical cursor movement.
Ensured Shift+Enter and Ctrl+Enter trigger a newline.
Ensured Ctrl+Left / Ctrl+Right trigger word-wise navigation.
Ensured Alt+D and Option+Delete trigger word-wise deletion.

Testing
Verified configuration loading and default values via unit tests.
Verified no remaining critical collisions in default keybinds.

[github-actions]

Thanks for your contribution!

This PR doesn't have a linked issue. All PRs must reference an existing issue.

Please:

1. Open an issue describing the bug/feature (if one doesn't exist)
2. Add Fixes #<number> or Closes #<number> to this PR description

See CONTRIBUTING.md for details.

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Based on my search, I found several related PRs that address TUI keybinding issues, but none appear to be duplicates of PR #8786. Here are the related PRs:

Related PRs (not duplicates):

1. PR tui: align keybinds with standard terminal/readline/screen conventions #4268 - "tui: align keybinds with standard terminal/readline/screen conventions" - Broader keybinding alignment effort that may have similar goals but appears to be an older/separate initiative
2. PR feat: add keybindings reference dialog to TUI #3888 - "feat: add keybindings reference dialog to TUI" - Feature addition for displaying keybindings, not a fix
3. PR feat: require double Ctrl+C to exit when input is empty #6494 - "feat: require double Ctrl+C to exit when input is empty" - Related to Ctrl+C handling but focuses on exit behavior
4. PR feat: add input_copy and input_cut keybindings for keyboard-based text selection #7520 - "feat: add input_copy and input_cut keybindings for keyboard-based text selection" - Related to text selection keybindings
5. PR feat: add manual refresh shortcut for models in tui #5018 - "feat: add manual refresh shortcut for models in tui" - Different feature scope
6. PR feat(tui): Allow keybinding of custom slash commands (resolves #5904) #5903 - "feat(tui): Allow keybinding of custom slash commands" - Different feature scope

None of these directly duplicate PR #8786's specific fixes for keybind conflicts and missing defaults related to issue #4997.

[LIHUA919]

Code review

Found 3 issues:

1. Removed optional chaining operator causes runtime error (will crash when project.sandboxes is undefined/null)

opencode/packages/opencode/src/project/project.ts

Lines 275 to 281 in 892b6eb

	const projects = await Promise.all(keys.map((x) => Storage.read<Info>(x)))
	return projects.map((project) => ({
	...project,
	sandboxes: project.sandboxes.filter((x) => existsSync(x)),
	}))
	}

2. Incorrect boolean logic in command filter (using || instead of && causes suggested items to be shown when they should be filtered out)

https://github.com/anomalyco/opencode/blob/892b6eb1e1daf6fb8cdece8fb06324db5cda9aa2/packages/app/src/context/command.tsx#L680-L686

3. Keybinding conflict: both input_clear and input_copy default to ctrl+c, creating ambiguous behavior when no text is selected

opencode/packages/opencode/src/config/config.ts

Lines 680 to 688 in 892b6eb

	agent_list: z.string().optional().default("<leader>a").describe("List agents"),
	agent_cycle: z.string().optional().default("tab").describe("Next agent"),
	agent_cycle_reverse: z.string().optional().default("shift+tab").describe("Previous agent"),
	variant_cycle: z.string().optional().default("ctrl+t").describe("Cycle model variants"),
	input_clear: z.string().optional().default("ctrl+c").describe("Clear input field"),
	input_copy: z.string().optional().default("ctrl+c,super+c").describe("Copy from input"),
	input_paste: z.string().optional().default("ctrl+v,super+v").describe("Paste from clipboard"),
	input_submit: z.string().optional().default("return").describe("Submit input"),
	input_newline: z

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