feat: ollama cloud usage meter

[Rtas-17]

Summary

Adds an Ollama Cloud (ollama.com) usage meter alongside the existing Claude Code, Codex, and Antigravity meters. Ollama exposes a quota page at https://ollama.com/settings but it is HTML, not an API — the only public Ollama Cloud API key only identifies the plan tier, not consumption — so this PR scrapes the aria-labelled percentages from the authenticated settings page using a captured browser session cookie.

How the user authenticates

Ollama Cloud auth is WorkOS-hosted; a raw Cookie: header from a non-Chrome process fails the session-binding check and returns 303 to signin.ollama.com. So this PR includes:

1. A standalone ollama-login-helper.exe process that opens an embedded WebView2 window (via wry+tao), lets the user complete WorkOS auth, and writes the resulting cookie to %LOCALAPPDATA%\ClaudeCodeUsageMonitor\ollama_session_cookie.txt.
2. A new tray menu item: right-click → Models → "Log in to Ollama…" — feature-gated behind --features ollama-login-webview (off by default because wry/tao add ~6 MB to the release binary).
3. Environment-variable fallback: setting OLLAMA_CLOUD_SESSION in env or ~/.claude/settings.json#env.OLLAMA_CLOUD_SESSION also works for headless setups.

What this PR adds

• src/models.rs: new optional ollama field on AppUsageData
• src/poller.rs: new poll_ollama() + read_ollama_session_cookie() + fetch_ollama_usage() + parse_ollama_usage() that scrape aria-labelled percentages from ollama.com/settings. Parser unit tests included (parses the real page structure, returns AuthExpired when logged out, returns ParseFailed when structure changes, etc.).
• src/window.rs: new bar in the widget, Models → Ollama toggle entry, localization entries, draw code. All gated behind the same toggle pattern as the other providers.
• src/main.rs: registers the new modules
• src/ollama_login.rs: tray-side helper that spawns the webview login process
• src/ollama_login_helper.rs: standalone WebView2 process (only built with --features ollama-login-webview) that opens an embedded Edge window, captures cookies, writes them to disk, then exits.
• Cargo.toml: registers the ollama-login-webview feature, optional wry/tao deps, and the second [[bin]] target for ollama-login-helper
• src/localization/*: new ollama_model and ollama_window_title strings across all 11 language files

Test plan

• cargo test passes (12/12 verified locally, including the new ollama parser tests)
• cargo build --release clean, no warnings
• cargo build --release --features ollama-login-webview clean
• Live: tray shows Ollama bar; toggling Models → Ollama shows/hides it and persists across restarts
• Live: with a captured cookie, the Ollama bar shows the real session/weekly percentages

I verified all of these on Windows 11 locally with the dev account — cookie capture works against ollama.com/settings, returns session=100% and weekly=44.2%.

Design notes

• Ollama returns an HTML page, not JSON, so I matched the actual aria-label structure with explicit regexes. I added a separate OllamaParseError enum so changes to ollama.com layout surface as PollError::RequestFailed rather than panicking.
• The webview login is a separate process because wry's EventLoop::run() on Windows must own the Win32 message pump — running it inside the tray's DispatchMessageW handler starves the event loop and WebView2 doesn't paint.
• The tray process never embeds wry/tao. The helper exe is the only thing that depends on it. Default builds add zero new dependencies.
• The Ollama parser deliberately fails (rather than showing fake zeros) when there's no cookie. The tray displays ! in the bar to make the missing-auth state obvious.

Why this is upstream-friendly

• No new runtime dependencies in the default build (wry/tao are feature-gated).
• Parser unit tests cover the happy path, zero-usage, and structure-change cases.
• Cookie capture is non-invasive — the tray just writes a plain text file the poller reads back.

What's not in this PR

• Fable 5 weekly meter — being handled separately in PR Add Fable 5 weekly usage meter for Claude Code #49.
• minimax / ~/.hermes/auth.json integration — local-fork feature, depends on Hermes internals, not proposed for upstream.

Risks

• Ollama.com layout change would break parsing. Mitigated by explicit OllamaParseError::AuthExpired and ParseFailed returning rather than panicking, plus the test fixtures.
• The cookie is captured in a regular WebView2 process rather than the user's Chrome profile, so it's a separate session. This is fine for Ollama Cloud auth because Ollama doesn't bind to the browser identity like Anthropic does — only the session cookie matters.

Let me know if you'd like the PR split or merged differently — happy to split out the webview login helper into a follow-up PR if you'd rather review the parsing change alone first.

[Copilot]

Pull request overview

Adds an Ollama Cloud usage meter to the existing multi-provider usage monitor, including polling/scraping Ollama’s authenticated settings page and optional WebView2-based login helper tooling.

Changes:

• Extend the usage data model and poller to optionally fetch/parse Ollama session + weekly usage from https://ollama.com/settings.
• Update the widget/tray UI to render and toggle an Ollama meter, including localized model/window strings.
• Add a feature-gated ollama-login-helper binary and tray integration to capture an authenticated cookie via WebView2.

Reviewed changes

Copilot reviewed 19 out of 20 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
src/window.rs	Adds Ollama state, UI rendering, tray/menu toggles, and polling integration.
src/poller.rs	Adds Ollama polling/scraping, parsing helpers, and unit tests; updates polling aggregation.
src/ollama_login.rs	Adds tray-side helper spawner for the feature-gated login flow.
src/ollama_login_helper.rs	Adds the standalone WebView2 login helper that captures cookies to disk.
src/models.rs	Extends AppUsageData with an optional ollama usage section.
src/main.rs	Registers the optional ollama_login module behind the feature gate.
src/localization/*	Adds ollama_model and ollama_window_title strings across languages.
src/localization/mod.rs	Extends the Strings struct to include Ollama strings.
Cargo.toml	Adds the ollama-login-webview feature, optional deps, and the helper [[bin]] target.
Cargo.lock	Updates lockfile for new optional dependencies.

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